1
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Journeaux KL, Boddy L, Rowland L, Hartley IP. A positive feedback to climate change: The effect of temperature on the respiration of key wood-decomposing fungi does not decline with time. Glob Chang Biol 2024; 30:e17212. [PMID: 38450825 DOI: 10.1111/gcb.17212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 01/21/2024] [Accepted: 02/05/2024] [Indexed: 03/08/2024]
Abstract
Heterotrophic soil microorganisms are responsible for ~50% of the carbon dioxide released by respiration from the terrestrial biosphere each year. The respiratory response of soil microbial communities to warming, and the control mechanisms, remains uncertain, yet is critical to understanding the future land carbon (C)-climate feedback. Individuals of nine species of fungi decomposing wood were exposed to 90 days of cooling to evaluate the medium-term effect of temperature on respiration. Overall, the effect of temperature on respiration increased in the medium term, with no evidence of compensation. However, the increasing effect of temperature on respiration was lost after correcting for changes in biomass. These results indicate that C loss through respiration of wood-decomposing fungi will increase beyond the direct effects of temperature on respiration, potentially promoting greater C losses from terrestrial ecosystems and a positive feedback to climate change.
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Affiliation(s)
- Katie L Journeaux
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, UK
| | - Lynne Boddy
- School of Biosciences, Cardiff University, Cardiff, UK
| | - Lucy Rowland
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, UK
| | - Iain P Hartley
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, UK
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2
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Bartholomew DC, Hayward R, Burslem DFRP, Bittencourt PRL, Chapman D, Bin Suis MAF, Nilus R, O'Brien MJ, Reynolds G, Rowland L, Banin LF, Dent D. Bornean tropical forests recovering from logging at risk of regeneration failure. Glob Chang Biol 2024; 30:e17209. [PMID: 38469989 DOI: 10.1111/gcb.17209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 01/08/2024] [Accepted: 01/17/2024] [Indexed: 03/13/2024]
Abstract
Active restoration through silvicultural treatments (enrichment planting, cutting climbers and liberation thinning) is considered an important intervention in logged forests. However, its ability to enhance regeneration is key for long-term recovery of logged forests, which remains poorly understood, particularly for the production and survival of seedlings in subsequent generations. To understand the long-term impacts of logging and restoration we tracked the diversity, survival and traits of seedlings that germinated immediately after a mast fruiting in North Borneo in unlogged and logged forests 30-35 years after logging. We monitored 5119 seedlings from germination for ~1.5 years across a mixed landscape of unlogged forests (ULs), naturally regenerating logged forests (NR) and actively restored logged forests via rehabilitative silvicultural treatments (AR), 15-27 years after restoration. We measured 14 leaf, root and biomass allocation traits on 399 seedlings from 15 species. Soon after fruiting, UL and AR forests had higher seedling densities than NR forest, but survival was the lowest in AR forests in the first 6 months. Community composition differed among forest types; AR and NR forests had lower species richness and lower evenness than UL forests by 5-6 months post-mast but did not differ between them. Differences in community composition altered community-weighted mean trait values across forest types, with higher root biomass allocation in NR relative to UL forest. Traits influenced mortality ~3 months post-mast, with more acquisitive traits and relative aboveground investment favoured in AR forests relative to UL forests. Our findings of reduced seedling survival and diversity suggest long time lags in post-logging recruitment, particularly for some taxa. Active restoration of logged forests recovers initial seedling production, but elevated mortality in AR forests lowers the efficacy of active restoration to enhance recruitment or diversity of seedling communities. This suggests current active restoration practices may fail to overcome barriers to regeneration in logged forests, which may drive long-term changes in future forest plant communities.
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Affiliation(s)
- David C Bartholomew
- School of Geography, University of Exeter, Exeter, UK
- Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
- Botanic Gardens Conservation International, Richmond, UK
| | - Robin Hayward
- Biological and Environmental Sciences, University of Stirling, Stirling, UK
- School of Earth and Environment, University of Leeds, Leeds, UK
| | | | | | - Daniel Chapman
- Biological and Environmental Sciences, University of Stirling, Stirling, UK
| | | | - Reuben Nilus
- Forest Research Centre Sepilok, Sandakan, Malaysia
| | - Michael J O'Brien
- Estación Experimental de Zonas Áridas, Consejo Superior de Investigaciones Científicas, Almería, Spain
| | - Glen Reynolds
- SE Asia Rainforest Research Partnership, Kota Kinabalu, Sabah, Malaysia
| | - Lucy Rowland
- School of Geography, University of Exeter, Exeter, UK
| | | | - Daisy Dent
- Smithsonian Tropical Research Institute, Balboa, Panama
- Department of Environmental Systems Science, ETH, Zürich, Switzerland
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3
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Binks O, Cernusak LA, Liddell M, Bradford M, Coughlin I, Bryant C, Palma AC, Hoffmann L, Alam I, Carle HJ, Rowland L, Oliveira RS, Laurance SGW, Mencuccini M, Meir P. Vapour pressure deficit modulates hydraulic function and structure of tropical rainforests under nonlimiting soil water supply. New Phytol 2023; 240:1405-1420. [PMID: 37705460 DOI: 10.1111/nph.19257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Accepted: 08/07/2023] [Indexed: 09/15/2023]
Abstract
Atmospheric conditions are expected to become warmer and drier in the future, but little is known about how evaporative demand influences forest structure and function independently from soil moisture availability, and how fast-response variables (such as canopy water potential and stomatal conductance) may mediate longer-term changes in forest structure and function in response to climate change. We used two tropical rainforest sites with different temperatures and vapour pressure deficits (VPD), but nonlimiting soil water supply, to assess the impact of evaporative demand on ecophysiological function and forest structure. Common species between sites allowed us to test the extent to which species composition, relative abundance and intraspecific variability contributed to site-level differences. The highest VPD site had lower midday canopy water potentials, canopy conductance (gc ), annual transpiration, forest stature, and biomass, while the transpiration rate was less sensitive to changes in VPD; it also had different height-diameter allometry (accounting for 51% of the difference in biomass between sites) and higher plot-level wood density. Our findings suggest that increases in VPD, even in the absence of soil water limitation, influence fast-response variables, such as canopy water potentials and gc , potentially leading to longer-term changes in forest stature resulting in reductions in biomass.
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Affiliation(s)
- Oliver Binks
- CREAF, Cerdanyola del Vallès, Barcelona, 08193, Spain
- Research School of Biology, The Australian National University, Canberra, 2601, ACT, Australia
| | - Lucas A Cernusak
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | - Michael Liddell
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | - Matt Bradford
- CSIRO Land and Water, Atherton, 4883, Qld, Australia
| | - Ingrid Coughlin
- Research School of Biology, The Australian National University, Canberra, 2601, ACT, Australia
| | - Callum Bryant
- Research School of Biology, The Australian National University, Canberra, 2601, ACT, Australia
| | - Ana C Palma
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | - Luke Hoffmann
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | - Iftakharul Alam
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | - Hannah J Carle
- Research School of Biology, The Australian National University, Canberra, 2601, ACT, Australia
| | - Lucy Rowland
- Geography, Faculty of Environment Science and Economy, University of Exeter, Laver Building, Exeter, EX4 4QE, UK
| | - Rafael S Oliveira
- Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas (UNICAMP), Campinas, 13083-970, SP, Brazil
| | - Susan G W Laurance
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, 4878, Qld, Australia
| | | | - Patrick Meir
- Research School of Biology, The Australian National University, Canberra, 2601, ACT, Australia
- School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, UK
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4
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Rowland L, Ramírez-Valiente JA, Hartley IP, Mencuccini M. How woody plants adjust above- and below-ground traits in response to sustained drought. New Phytol 2023. [PMID: 37306017 DOI: 10.1111/nph.19000] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 04/01/2023] [Indexed: 06/13/2023]
Abstract
Future increases in drought severity and frequency are predicted to have substantial impacts on plant function and survival. However, there is considerable uncertainty concerning what drought adjustment is and whether plants can adjust to sustained drought. This review focuses on woody plants and synthesises the evidence for drought adjustment in a selection of key above-ground and below-ground plant traits. We assess whether evaluating the drought adjustment of single traits, or selections of traits that operate on the same plant functional axis (e.g. photosynthetic traits) is sufficient, or whether a multi-trait approach, integrating across multiple axes, is required. We conclude that studies on drought adjustments in woody plants might overestimate the capacity for adjustment to drier environments if spatial studies along gradients are used, without complementary experimental approaches. We provide evidence that drought adjustment is common in above-ground and below-ground traits; however, whether this is adaptive and sufficient to respond to future droughts remains uncertain for most species. To address this uncertainty, we must move towards studying trait integration within and across multiple axes of plant function (e.g. above-ground and below-ground) to gain a holistic view of drought adjustments at the whole-plant scale and how these influence plant survival.
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Affiliation(s)
- Lucy Rowland
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, EX4 4RJ, UK
| | | | - Iain P Hartley
- Geography, Faculty of Environment, Science and Economy, University of Exeter, Exeter, EX4 4RJ, UK
| | - Maurizio Mencuccini
- CREAF, Campus de Bellaterra (UAB), Cerdanyola del Vallés, Barcelona, 08193, Spain
- ICREA, Barcelona, 08010, Spain
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5
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Barros FDV, Lewis K, Robertson AD, Pennington RT, Hill TC, Matthews C, Lira-Martins D, Mazzochini GG, Oliveira RS, Rowland L. Cost-effective restoration for carbon sequestration across Brazil's biomes. Sci Total Environ 2023; 876:162600. [PMID: 36871717 DOI: 10.1016/j.scitotenv.2023.162600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Tropical ecosystems are central to the global focus on halting and reversing habitat destruction as a means of mitigating carbon emissions. Brazil has been highlighted as a vital part of global climate agreements because, whilst ongoing land-use change causes it to be the world's fifth biggest greenhouse gas emitting country, it also has one of the greatest potentials to implement ecosystem restoration. Global carbon markets provide the opportunity of a financially viable way to implement restoration projects at scale. However, except for rainforests, the restoration potential of many major tropical biomes is not widely recognised, with the result that carbon sequestration potential may be squandered. We synthesize data on land availability, land degradation status, restoration costs, area of native vegetation remaining, carbon storage potential and carbon market prices for 5475 municipalities across Brazil's major biomes, including the savannas and tropical dry forests. Using a modelling analysis, we determine how fast restoration could be implemented across these biomes within existing carbon markets. We argue that even with a sole focus on carbon, we must restore other tropical biomes, as well as rainforests, to effectively increase benefits. The inclusion of dry forests and savannas doubles the area which could be restored in a financially viable manner, increasing the potential CO2e sequestered >40 % above that offered by rainforests alone. Importantly, we show that in the short-term avoiding emissions through conservation will be necessary for Brazil to achieve it's 2030 climate goal, because it can sequester 1.5 to 4.3 Pg of CO2e by 2030, relative to 0.127 Pg CO2e from restoration. However, in the longer term, restoration across all biomes in Brazil could draw down between 3.9 and 9.8 Pg of CO2e from the atmosphere by 2050 and 2080.
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Affiliation(s)
- F de V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK.
| | - K Lewis
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - A D Robertson
- Department of Soil and Crop Sciences Colorado State University, Fort Collins, CO 80523, USA; Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA
| | - R T Pennington
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK; Royal Botanic Garden Edinburgh, Edinburgh EH3 5LR, UK
| | - T C Hill
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - C Matthews
- Independent Research, 3 Cultins Rd, Edinburgh EH11 4DF, UK
| | - D Lira-Martins
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - G G Mazzochini
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - R S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP 13083-970, Brazil
| | - L Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
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6
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Tavares JV, Oliveira RS, Mencuccini M, Signori-Müller C, Pereira L, Diniz FC, Gilpin M, Marca Zevallos MJ, Salas Yupayccana CA, Acosta M, Pérez Mullisaca FM, Barros FDV, Bittencourt P, Jancoski H, Scalon MC, Marimon BS, Oliveras Menor I, Marimon BH, Fancourt M, Chambers-Ostler A, Esquivel-Muelbert A, Rowland L, Meir P, Lola da Costa AC, Nina A, Sanchez JMB, Tintaya JS, Chino RSC, Baca J, Fernandes L, Cumapa ERM, Santos JAR, Teixeira R, Tello L, Ugarteche MTM, Cuellar GA, Martinez F, Araujo-Murakami A, Almeida E, da Cruz WJA, Del Aguila Pasquel J, Aragāo L, Baker TR, de Camargo PB, Brienen R, Castro W, Ribeiro SC, Coelho de Souza F, Cosio EG, Davila Cardozo N, da Costa Silva R, Disney M, Espejo JS, Feldpausch TR, Ferreira L, Giacomin L, Higuchi N, Hirota M, Honorio E, Huaraca Huasco W, Lewis S, Flores Llampazo G, Malhi Y, Monteagudo Mendoza A, Morandi P, Chama Moscoso V, Muscarella R, Penha D, Rocha MC, Rodrigues G, Ruschel AR, Salinas N, Schlickmann M, Silveira M, Talbot J, Vásquez R, Vedovato L, Vieira SA, Phillips OL, Gloor E, Galbraith DR. Basin-wide variation in tree hydraulic safety margins predicts the carbon balance of Amazon forests. Nature 2023; 617:111-117. [PMID: 37100901 PMCID: PMC10156596 DOI: 10.1038/s41586-023-05971-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 03/17/2023] [Indexed: 04/28/2023]
Abstract
Tropical forests face increasing climate risk1,2, yet our ability to predict their response to climate change is limited by poor understanding of their resistance to water stress. Although xylem embolism resistance thresholds (for example, [Formula: see text]50) and hydraulic safety margins (for example, HSM50) are important predictors of drought-induced mortality risk3-5, little is known about how these vary across Earth's largest tropical forest. Here, we present a pan-Amazon, fully standardized hydraulic traits dataset and use it to assess regional variation in drought sensitivity and hydraulic trait ability to predict species distributions and long-term forest biomass accumulation. Parameters [Formula: see text]50 and HSM50 vary markedly across the Amazon and are related to average long-term rainfall characteristics. Both [Formula: see text]50 and HSM50 influence the biogeographical distribution of Amazon tree species. However, HSM50 was the only significant predictor of observed decadal-scale changes in forest biomass. Old-growth forests with wide HSM50 are gaining more biomass than are low HSM50 forests. We propose that this may be associated with a growth-mortality trade-off whereby trees in forests consisting of fast-growing species take greater hydraulic risks and face greater mortality risk. Moreover, in regions of more pronounced climatic change, we find evidence that forests are losing biomass, suggesting that species in these regions may be operating beyond their hydraulic limits. Continued climate change is likely to further reduce HSM50 in the Amazon6,7, with strong implications for the Amazon carbon sink.
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Affiliation(s)
- Julia Valentim Tavares
- School of Geography, University of Leeds, Leeds, UK.
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.
| | - Rafael S Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
| | | | - Caroline Signori-Müller
- School of Geography, University of Leeds, Leeds, UK
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Department of Plant Biology, Institute of Biology, Programa de Pós Graduação em Biologia Vegetal, University of Campinas, Campinas, Brazil
| | - Luciano Pereira
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, Germany
| | | | | | | | | | - Martin Acosta
- Programa de Pós-Graduação em Ecologia e Manejo de Recursos Naturais, Universidade Federal do Acre, Rio Branco, Brazil
| | | | - Fernanda de V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Department of Plant Biology, Institute of Biology, Programa de Pós Graduação em Ecologia, University of Campinas, Campinas, Brazil
| | - Paulo Bittencourt
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Halina Jancoski
- Departamento de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), Nova Xavantina, Brazil
| | - Marina Corrêa Scalon
- Departamento de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), Nova Xavantina, Brazil
- Programa de Pós-Graduação em Ecologia e Conservação, Universidade Federal do Paraná, Curitiba, Brazil
| | - Beatriz S Marimon
- Departamento de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), Nova Xavantina, Brazil
| | - Imma Oliveras Menor
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), CIRAD, CNRS, INRA, IRD, Université de Montpellier, Montpellier, France
| | - Ben Hur Marimon
- Departamento de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), Nova Xavantina, Brazil
| | - Max Fancourt
- School of Geography, University of Leeds, Leeds, UK
| | | | - Adriane Esquivel-Muelbert
- School of Geography, University of Birmingham, Birmingham, UK
- Birmingham Institute of Forest Research (BIFoR), Birmingham, UK
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Patrick Meir
- School of Geosciences, University of Edinburgh, Edinburgh, UK
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
| | | | - Alex Nina
- Pontificia Universidad Católica del Perú, Lima, Peru
| | | | - Jose S Tintaya
- Universidad Nacional de San Antonio Abad del Cusco, Cusco, Peru
| | | | - Jean Baca
- Universidad Nacional de la Amazonia Peruana, Iquitos, Peru
| | | | - Edwin R M Cumapa
- Instituto de Geociências, Faculdade de Meteorologia, Universidade Federal do Pará, Belém, Brazil
| | | | - Renata Teixeira
- Universidad Nacional de San Antonio Abad del Cusco, Cusco, Peru
| | - Ligia Tello
- Universidad Nacional de la Amazonia Peruana, Iquitos, Peru
| | - Maira T M Ugarteche
- Museo de Historia Natural Noel Kempff Mercado, Santa Cruz de la Sierra, Bolivia
- Universidad Autonoma Gabriel Rene Moreno, Santa Cruz, Bolivia
| | - Gina A Cuellar
- Museo de Historia Natural Noel Kempff Mercado, Santa Cruz de la Sierra, Bolivia
- Universidad Autonoma Gabriel Rene Moreno, Santa Cruz, Bolivia
| | - Franklin Martinez
- Museo de Historia Natural Noel Kempff Mercado, Santa Cruz de la Sierra, Bolivia
- Universidad Autonoma Gabriel Rene Moreno, Santa Cruz, Bolivia
| | - Alejandro Araujo-Murakami
- Museo de Historia Natural Noel Kempff Mercado, Santa Cruz de la Sierra, Bolivia
- Universidad Autonoma Gabriel Rene Moreno, Santa Cruz, Bolivia
| | - Everton Almeida
- Instituto de Biodiversidade e Florestas, Universidade Federal do Oeste do Pará, Santarém, Brazil
| | | | - Jhon Del Aguila Pasquel
- Universidad Nacional de la Amazonia Peruana (UNAP), Iquitos, Peru
- Instituto de Investigaciones de la Amazonia Peruana, Iquitos, Peru
| | - Luís Aragāo
- National Institute for Space Research (INPE), São José dos Campos-SP, Brazil
| | | | | | - Roel Brienen
- School of Geography, University of Leeds, Leeds, UK
| | - Wendeson Castro
- Laboratório de Botânica e Ecologia Vegetal, Universidade Federal do Acre, Rio Branco, Brazil
- SOS Amazônia, Programa Governança e Proteção da Paisagem Verde na Amazônia, Rio Branco-AC, Brazil
| | | | | | - Eric G Cosio
- Sección Química, Pontificia Universidad Católica del Perú, Lima, Peru
| | | | - Richarlly da Costa Silva
- Programa de Pós-Graduação em Ecologia e Manejo de Recursos Naturais, Universidade Federal do Acre, Rio Branco, Brazil
- Instituto Federal de Educação, Ciência e Tecnologia do Acre, Campus Baixada do Sol, Rio Branco, Brazil
| | - Mathias Disney
- Department of Geography, University College London, London, UK
| | - Javier Silva Espejo
- Universidad Nacional de San Antonio Abad del Cusco, Cusco, Peru
- Departamento de Biología, Universidad de La Serena, La Serena, Chile
| | - Ted R Feldpausch
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | - Leandro Giacomin
- Departamento de Sistemática e Ecologia, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, João Pessoa, Brazil
| | - Niro Higuchi
- Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil
| | - Marina Hirota
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
- Department of Physics, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Euridice Honorio
- Instituto de Investigaciones de la Amazonia Peruana, Iquitos, Peru
| | - Walter Huaraca Huasco
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
| | - Simon Lewis
- School of Geography, University of Leeds, Leeds, UK
- Department of Geography, University College London, London, UK
| | - Gerardo Flores Llampazo
- Instituto de Investigaciones de la Amazonia Peruana, Iquitos, Peru
- Universidad Nacional Jorge Basadre de Grohmann (UNJBG), Tacna, Peru
| | - Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
| | - Abel Monteagudo Mendoza
- Universidad Nacional de San Antonio Abad del Cusco, Cusco, Peru
- Jardín Botánico de Missouri, Oxapampa, Peru
| | - Paulo Morandi
- Departamento de Ciências Biológicas, Universidade do Estado de Mato Grosso (UNEMAT), Nova Xavantina, Brazil
| | - Victor Chama Moscoso
- Universidad Nacional de San Antonio Abad del Cusco, Cusco, Peru
- Jardín Botánico de Missouri, Oxapampa, Peru
| | - Robert Muscarella
- Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden
| | - Deliane Penha
- Programa de Pós-Graduação em Biodiversidade, Universidade Federal do Oeste do Pará, Santarém, Brazil
| | - Mayda Cecília Rocha
- Instituto de Ciências e Tecnologia das Águas, Universidade Federal do Oeste do Pará, Santarém, Brazil
| | - Gleicy Rodrigues
- Programa de Pós-Graduação em Botânica, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil
| | | | - Norma Salinas
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
- Sección Química, Pontificia Universidad Católica del Perú, Lima, Peru
| | - Monique Schlickmann
- Programa de Pós-Graduação em Biodiversidade, Universidade Federal do Oeste do Pará, Santarém, Brazil
| | - Marcos Silveira
- Museu Universitário, Centro de Ciências Biológicas e da Natureza, Universidade Federal do Acre, Rio Branco, Brazil
| | - Joey Talbot
- Institute for Transport Studies, University of Leeds, Leeds, UK
| | | | - Laura Vedovato
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Simone Aparecida Vieira
- Núcleo de Estudos e Pesquisas Ambientais, Universidade Estadual de Campinas, Campinas, Brazil
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7
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McCalmont J, Kho LK, Teh YA, Chocholek M, Rumpang E, Rowland L, Basri MHA, Hill T. Oil palm (Elaeis guineensis) plantation on tropical peatland in South East Asia: Photosynthetic response to soil drainage level for mitigation of soil carbon emissions. Sci Total Environ 2023; 858:159356. [PMID: 36270353 DOI: 10.1016/j.scitotenv.2022.159356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 10/05/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
While existing moratoria in Indonesia and Malaysia should preclude continued large-scale expansion of palm oil production into new areas of South-East Asian tropical peatland, existing plantations in the region remain a globally significant source of atmospheric carbon due to drainage driven decomposition of peatland soils. Previous studies have made clear the direct link between drainage depth and peat carbon decomposition and significant reductions in the emission rate of CO2 can be made by raising water tables nearer to the soil surface. However, the impact of such changes on palm fruit yield is not well understood and will be a critical consideration for plantation managers. Here we take advantage of very high frequency, long-term monitoring of canopy-scale carbon exchange at a mature oil palm plantation in Malaysian Borneo to investigate the relationship between drainage level and photosynthetic uptake and consider the confounding effects of light quality and atmospheric vapour pressure deficit. Canopy modelling from our dataset demonstrated that palms were exerting significantly greater stomatal control at deeper water table depths (WTD) and the optimum WTD for photosynthesis was found to be between 0.3 and 0.4 m below the soil surface. Raising WTD to this level, from the industry typical drainage level of 0.6 m, could increase photosynthetic uptake by 3.6 % and reduce soil surface emission of CO2 by 11 %. Our study site further showed that despite being poorly drained compared to other planting blocks at the same plantation, monthly fruit bunch yield was, on average, 14 % greater. While these results are encouraging, and at least suggest that raising WTD closer to the soil surface to reduce emissions is unlikely to produce significant yield penalties, our results are limited to a single study site and more work is urgently needed to confirm these results at other plantations.
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Affiliation(s)
- Jon McCalmont
- College of Life and Environmental Science, University of Exeter, Streatham Campus, Rennes Drive, Exeter EX4 4RJ, UK; School of Biological Sciences, University of Aberdeen, King's College, Aberdeen AB24 3FX, UK.
| | - Lip Khoon Kho
- Peat Ecosystem and Biodiversity Unit, Biology and Sustainability Research Division, Malaysian Palm Oil Board, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia; Economic Planning Unit, Sarawak Chief Minister's Dept., 93502 Kuching, Sarawak, Malaysia
| | - Yit Arn Teh
- School of Natural and Environmental Science, Newcastle University, Drummond Building, Newcastle-upon-Tyne NE1 7RU, UK
| | - Melanie Chocholek
- Dept. Earth and Environmental Science, University of St. Andrews, Irvine Building, North Street, St. Andrews KY16 9AL, UK
| | - Elisa Rumpang
- Peat Ecosystem and Biodiversity Unit, Biology and Sustainability Research Division, Malaysian Palm Oil Board, 6, Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia
| | - Lucy Rowland
- College of Life and Environmental Science, University of Exeter, Streatham Campus, Rennes Drive, Exeter EX4 4RJ, UK
| | - Mohd Hadi Akbar Basri
- College of Life and Environmental Science, University of Exeter, Streatham Campus, Rennes Drive, Exeter EX4 4RJ, UK; Dept. of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Tim Hill
- College of Life and Environmental Science, University of Exeter, Streatham Campus, Rennes Drive, Exeter EX4 4RJ, UK
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8
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Pilon NAL, Campos BH, Durigan G, Cava MGB, Rowland L, Schmidt I, Sampaio A, Oliveira RS. Challenges and directions for open ecosystems biodiversity restoration: An overview of the techniques applied for Cerrado. J Appl Ecol 2023. [DOI: 10.1111/1365-2664.14368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Natashi A. L. Pilon
- Department of Plant Biology, Institute of Biology, P.O. Box: 6109 University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - Bruna H. Campos
- Programa de Pós‐graduação em Ecologia University of Campinas, UNICAMP, PO Box 6109, 13083 – Campinas SP Brazil
| | - Giselda Durigan
- Programa de Pós‐graduação em Ecologia University of Campinas, UNICAMP, PO Box 6109, 13083 – Campinas SP Brazil
- Laboratório de Ecologia e Hidrologia, Instituto de Pesquisas Ambientais, Caixa Postal 104, 19807‐300 Assis SP Brazil
| | - Mário G. B. Cava
- Programa de Pós‐graduação em Conservação de Recursos Naturais do Cerrado, Instituto Federal Goiano, 75790‐000 Urutaí GO Brazil
| | - Lucy Rowland
- College of Life and Environmental Sciences University of Exeter Exeter U.K
| | - Isabel Schmidt
- Department of Ecology University of Brasilia Brasília DF Brazil
| | | | - Rafael S. Oliveira
- Department of Plant Biology, Institute of Biology, P.O. Box: 6109 University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
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9
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Lewis K, Barros FDV, Moonlight PW, Hill TC, Oliveira RS, Schmidt IB, Sampaio AB, Pennington RT, Rowland L. Identifying hotspots for ecosystem restoration across heterogeneous tropical savannah-dominated regions. Philos Trans R Soc Lond B Biol Sci 2023; 378:20210075. [PMID: 36373925 PMCID: PMC9661949 DOI: 10.1098/rstb.2021.0075] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 01/24/2022] [Indexed: 11/16/2022] Open
Abstract
There is high potential for ecosystem restoration across tropical savannah-dominated regions, but the benefits that could be gained from this restoration are rarely assessed. This study focuses on the Brazilian Cerrado, a highly species-rich savannah-dominated region, as an exemplar to review potential restoration benefits using three metrics: net biomass gains, plant species richness and ability to connect restored and native vegetation. Localized estimates of the most appropriate restoration vegetation type (grassland, savannah, woodland/forest) for pasturelands are produced. Carbon sequestration potential is significant for savannah and woodland/forest restoration in the seasonally dry tropics (net biomass gains of 58.2 ± 37.7 and 130.0 ± 69.4 Mg ha-1). Modelled restoration species richness gains were highest in the central and south-east of the Cerrado for savannahs and grasslands, and in the west and north-west for woodlands/forests. The potential to initiate restoration projects across the whole of the Cerrado is high and four hotspot areas are identified. We demonstrate that landscape restoration across all vegetation types within heterogeneous tropical savannah-dominated regions can maximize biodiversity and carbon gains. However, conservation of existing vegetation is essential to minimizing the cost and improving the chances of restoration success. This article is part of the theme issue 'Understanding forest landscape restoration: reinforcing scientific foundations for the UN Decade on Ecosystem Restoration'.
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Affiliation(s)
- Kennedy Lewis
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
| | - Fernanda de V. Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
| | - Peter W. Moonlight
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
- Tropical Diversity Section, Royal Botanic Gardens Edinburgh, Edinburgh EH3 5LR, UK
| | - Timothy C. Hill
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
| | - Rafael S. Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, CEP 13083-970, Brazil
| | - Isabel B. Schmidt
- Department of Ecology, University of Brasília, Brasília, CEP 70.910-900, Brazil
| | - Alexandre B. Sampaio
- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado CBC, Instituto Chico Mendes de Conservação da Biodiversidade – ICMBio, University of Brasília, Brasília, CEP 70.670-350, Brazil
| | - R. Toby Pennington
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
- Tropical Diversity Section, Royal Botanic Gardens Edinburgh, Edinburgh EH3 5LR, UK
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, Devon EX4 4QE, UK
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10
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Silva MC, Moonlight P, Oliveira RS, Pennington RT, Rowland L. Toward diverse seed sourcing to upscale ecological restoration in the Brazilian Cerrado. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.1045591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Seed markets are vital to scaling up ecosystem restoration in the Brazilian Cerrado, home of the world’s most species-rich grasslands and savannas. We compiled lists of species traded by four major Cerrado seed supply systems to investigate the representativeness of the species currently available for seed-based restoration. We also identified whether dominant ground-layer species are being sourced for seed production. Seeds from 263 Cerrado species can be purchased for restoration, of which 68% are trees, particularly legumes (24%). 63% of the traded species were found in only one seed supply system. The five most dominant graminoids of the Cerrado ground layer were available for sale, but two additional species uncommon in old-growth areas represented 44% of the sales of a key seed trader in Central Brazil. The expansion of Cerrado seed supply systems should be supported to further increase the number of species on the market. Sourcing seeds from a diversity of herbaceous species is central to facilitating the restoration of species-rich grasslands and savannas in the Cerrado. Recovering the diversity and functioning of old-growth open ecosystems through seeds will depend on increasing the supply and demand for species typical of Cerrado’s ground layer.
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11
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Bittencourt PRDL, Bartholomew DC, Banin LF, Bin Suis MAF, Nilus R, Burslem DFRP, Rowland L. Divergence of hydraulic traits among tropical forest trees across topographic and vertical environment gradients in Borneo. New Phytol 2022; 235:2183-2198. [PMID: 35633119 PMCID: PMC9545514 DOI: 10.1111/nph.18280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 05/23/2022] [Indexed: 06/13/2023]
Abstract
Fine-scale topographic-edaphic gradients are common in tropical forests and drive species spatial turnover and marked changes in forest structure and function. We evaluate how hydraulic traits of tropical tree species relate to vertical and horizontal spatial niche specialization along such a gradient. Along a topographic-edaphic gradient with uniform climate in Borneo, we measured six key hydraulic traits in 156 individuals of differing heights in 13 species of Dipterocarpaceae. We investigated how hydraulic traits relate to habitat, tree height and their interaction on this gradient. Embolism resistance increased in trees on sandy soils but did not vary with tree height. By contrast, water transport capacity increased on sandier soils and with increasing tree height. Habitat and height only interact for hydraulic efficiency, with slope for height changing from positive to negative from the clay-rich to the sandier soil. Habitat type influenced trait-trait relationships for all traits except wood density. Our data reveal that variation in the hydraulic traits of dipterocarps is driven by a combination of topographic-edaphic conditions, tree height and taxonomic identity. Our work indicates that hydraulic traits play a significant role in shaping forest structure across topographic-edaphic and vertical gradients and may contribute to niche specialization among dipterocarp species.
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Affiliation(s)
| | - David C. Bartholomew
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4QEUK
- Department of Ecology and Environmental ScienceUmeå University90736UmeåSweden
| | | | | | - Reuben Nilus
- Sabah Forestry DepartmentForest Research CentrePO Box 1407Sandakan90715SabahMalaysia
| | | | - Lucy Rowland
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4QEUK
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12
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Ellsworth DS, Crous KY, De Kauwe MG, Verryckt LT, Goll D, Zaehle S, Bloomfield KJ, Ciais P, Cernusak LA, Domingues TF, Dusenge ME, Garcia S, Guerrieri R, Ishida FY, Janssens IA, Kenzo T, Ichie T, Medlyn BE, Meir P, Norby RJ, Reich PB, Rowland L, Santiago LS, Sun Y, Uddling J, Walker AP, Weerasinghe KWLK, van de Weg MJ, Zhang YB, Zhang JL, Wright IJ. Convergence in phosphorus constraints to photosynthesis in forests around the world. Nat Commun 2022; 13:5005. [PMID: 36008385 PMCID: PMC9411118 DOI: 10.1038/s41467-022-32545-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 08/03/2022] [Indexed: 12/02/2022] Open
Abstract
Tropical forests take up more carbon (C) from the atmosphere per annum by photosynthesis than any other type of vegetation. Phosphorus (P) limitations to C uptake are paramount for tropical and subtropical forests around the globe. Yet the generality of photosynthesis-P relationships underlying these limitations are in question, and hence are not represented well in terrestrial biosphere models. Here we demonstrate the dependence of photosynthesis and underlying processes on both leaf N and P concentrations. The regulation of photosynthetic capacity by P was similar across four continents. Implementing P constraints in the ORCHIDEE-CNP model, gross photosynthesis was reduced by 36% across the tropics and subtropics relative to traditional N constraints and unlimiting leaf P. Our results provide a quantitative relationship for the P dependence for photosynthesis for the front-end of global terrestrial C models that is consistent with canopy leaf measurements. Phosphorus (P) limitation is pervasive in tropical forests. Here the authors analyse the dependence of photosynthesis on leaf N and P in tropical forests, and show that incorporating leaf P constraints in a terrestrial biosphere model enhances its predictive power.
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Affiliation(s)
- David S Ellsworth
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.
| | - Kristine Y Crous
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
| | - Martin G De Kauwe
- School of Biological Sciences, University of Bristol, Bristol, UK.,ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia
| | - Lore T Verryckt
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Daniel Goll
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France.,Lehrstuhl für Physische Geographie mit Schwerpunkt Klimaforschung, Universität Augsburg, Augsburg, Germany
| | - Sönke Zaehle
- Max Planck Institute for Biogeochemistry, Jena, Germany
| | | | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France
| | - Lucas A Cernusak
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia
| | - Tomas F Domingues
- Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Depto. de Biologia, Universidade de São Paulo-Ribeirão Preto, Ribeirão Preto, Brazil
| | - Mirindi Eric Dusenge
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden.,College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Sabrina Garcia
- National Institute of Amazonian Research (INPA), Manaus, Brazil
| | - Rossella Guerrieri
- Department of Agricultural and Food Sciences, University of Bologna, Bologna, Italy
| | - F Yoko Ishida
- Centre for Tropical Environmental and Sustainability Science, College of Science and Engineering, James Cook University, Cairns, Australia
| | - Ivan A Janssens
- Department of Biology, University of Antwerp, Antwerp, Belgium
| | - Tanaka Kenzo
- Japan International Research Centre for Agricultural Sciences, Tsukuba, Japan
| | - Tomoaki Ichie
- Faculty of Agriculture and Marine Science, Kochi University, Kochi, Japan
| | - Belinda E Medlyn
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
| | - Patrick Meir
- Research School of Biology, The Australian National University, Canberra, ACT, Australia.,School of Geosciences, Edinburgh University, Edinburgh, Scotland, UK
| | - Richard J Norby
- Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA
| | - Peter B Reich
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.,Department of Forest Resources, University of Minnesota, St. Paul, MN, USA.,Institute for Global Change Biology, and School for the Environment and Sustainability, University of Michigan, Ann Arbor, MI, 48109, US
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Louis S Santiago
- Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA, USA
| | - Yan Sun
- Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Institut Pierre Simon Laplace, CEA/CNRS/Université de Versailles Saint-Quentin-en-Yvelines/ Université de Paris Saclay, Gif-sur-Yvette, France.,College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Johan Uddling
- Department of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden
| | - Anthony P Walker
- Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | | | - Yun-Bing Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Jiao-Lin Zhang
- CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China
| | - Ian J Wright
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia.,Department of Biological Sciences, Macquarie University, North Ryde, NSW, Australia
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13
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D’Angioli AM, Giles AL, Costa PB, Wolfsdorf G, Pecoral LLF, Verona L, Piccolo F, Sampaio AB, Schmidt IB, Rowland L, Lambers H, Kandeler E, Oliveira RS, Abrahão A. Abandoned pastures and restored savannahs have distinct patterns of plant‐soil feedback and nutrient cycling compared with native Brazilian savannahs. J Appl Ecol 2022. [DOI: 10.1111/1365-2664.14193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- André M. D’Angioli
- Programa de pós‐graduação em Ecologia, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas Brasil
| | - André L. Giles
- Programa de pós‐graduação em Ecologia, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas Brasil
| | - Patricia B. Costa
- Programa de pós‐graduação em Biologia Vegetal, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas Brasil
- School of Biological Sciences University of Western Australia Perth Australia
| | - Gabriel Wolfsdorf
- Programa de pós‐graduação em Ecologia, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas Brasil
| | - Luisa L. F. Pecoral
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Campinas, São Paulo Brasil
| | - Larissa Verona
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Campinas, São Paulo Brasil
| | - Fernanda Piccolo
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Campinas, São Paulo Brasil
| | | | - Isabel B. Schmidt
- Departamento de Ecologia, Universidade de Brasília, Brasília DF Brasil
| | - Lucy Rowland
- College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Hans Lambers
- School of Biological Sciences University of Western Australia Perth Australia
| | - Ellen Kandeler
- Institute of Soil Science and Land Evaluation, Soil Biology Department University of Hohenheim Stuttgart Germany
| | - Rafael S. Oliveira
- Departamento de Biologia Vegetal, Universidade Estadual de Campinas, Campinas, São Paulo Brasil
- School of Biological Sciences University of Western Australia Perth Australia
| | - Anna Abrahão
- Programa de pós‐graduação em Biologia Vegetal, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas Brasil
- Institute of Soil Science and Land Evaluation, Soil Biology Department University of Hohenheim Stuttgart Germany
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14
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Giles AL, Rowland L, Bittencourt PRL, Bartholomew DC, Coughlin I, Costa PB, Domingues T, Miatto RC, Barros FV, Ferreira LV, Groenendijk P, Oliveira AAR, da Costa ACL, Meir P, Mencuccini M, Oliveira RS. Small understorey trees have greater capacity than canopy trees to adjust hydraulic traits following prolonged experimental drought in a tropical forest. Tree Physiol 2022; 42:537-556. [PMID: 34508606 DOI: 10.1093/treephys/tpab121] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Future climate change predictions for tropical forests highlight increased frequency and intensity of extreme drought events. However, it remains unclear whether large and small trees have differential strategies to tolerate drought due to the different niches they occupy. The future of tropical forests is ultimately dependent on the capacity of small trees (<10 cm in diameter) to adjust their hydraulic system to tolerate drought. To address this question, we evaluated whether the drought tolerance of neotropical small trees can adjust to experimental water stress and was different from tall trees. We measured multiple drought resistance-related hydraulic traits across nine common neotropical genera at the world's longest-running tropical forest throughfall-exclusion experiment and compared their responses with surviving large canopy trees. Small understorey trees in both the control and the throughfall-exclusion treatment had lower minimum stomatal conductance and maximum hydraulic leaf-specific conductivity relative to large trees of the same genera, as well as a greater hydraulic safety margin (HSM), percentage loss of conductivity and embolism resistance, demonstrating that they occupy a distinct hydraulic niche. Surprisingly, in response to the drought treatment, small trees increased specific hydraulic conductivity by 56.3% and leaf:sapwood area ratio by 45.6%. The greater HSM of small understorey trees relative to large canopy trees likely enabled them to adjust other aspects of their hydraulic systems to increase hydraulic conductivity and take advantage of increases in light availability in the understorey resulting from the drought-induced mortality of canopy trees. Our results demonstrate that differences in hydraulic strategies between small understorey and large canopy trees drive hydraulic niche segregation. Small understorey trees can adjust their hydraulic systems in response to changes in water and light availability, indicating that natural regeneration of tropical forests following long-term drought may be possible.
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Affiliation(s)
- A L Giles
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
| | - L Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - P R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - D C Bartholomew
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - I Coughlin
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
- Research School of Biology, Australian National University, 134 Linnaeus Way, Canberra ACT 2601, Australia
| | - P B Costa
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
- Biological Sciences, Stirling Highway, Perth, WA 6009, Australia
| | - T Domingues
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
| | - R C Miatto
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Av. Bandeirantes, 3900 - Vila Monte Alegre, Ribeirão Preto SP 14040-900, Brazil
| | - F V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4RJ, UK
| | - L V Ferreira
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
| | - P Groenendijk
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
| | - A A R Oliveira
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
| | - A C L da Costa
- Museu Paraense Emílio Goeldi, Av. Gov Magalhães Barata, 376 - São Brás, Belém PA 66040-170, Brazil
- Biological Sciences, Stirling Highway, Perth, WA 6009, Australia
| | - P Meir
- Research School of Biology, Australian National University, 134 Linnaeus Way, Canberra ACT 2601, Australia
- School of GeoSciences, University of Edinburgh, Drummond St Edinburgh EH9 3FF, UK
| | - M Mencuccini
- CREAF, Campus UAB, Edifici C Campus de Bellaterra Cerdanyola del Vallés 08193, Spain
- ICREA, Passeig de Lluís Companys, 23, Barcelona 08010, Spain
| | - R S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), R. Monteiro Lobato, 255 - Barão Geraldo, Campinas SP 13083-970, Brazil
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15
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Signori‐Müller C, Oliveira RS, Valentim Tavares J, Carvalho Diniz F, Gilpin M, de V. Barros F, Marca Zevallos MJ, Salas Yupayccana CA, Nina A, Brum M, Baker TR, Cosio EG, Malhi Y, Monteagudo Mendoza A, Phillips OL, Rowland L, Salinas N, Vasquez R, Mencuccini M, Galbraith D. Variation of non‐structural carbohydrates across the fast–slow continuum in Amazon Forest canopy trees. Funct Ecol 2021. [DOI: 10.1111/1365-2435.13971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Caroline Signori‐Müller
- Geography College of Life and Environmental Sciences University of Exeter Exeter UK
- Department of Plant Biology Institute of Biology Programa de Pós Graduação em Biologia Vegetal University of Campinas Campinas Brazil
- School of Geography University of Leeds Leeds UK
| | - Rafael S. Oliveira
- Department of Plant Biology Institute of Biology University of Campinas Campinas Brazil
| | | | | | | | - Fernanda de V. Barros
- Geography College of Life and Environmental Sciences University of Exeter Exeter UK
- Department of Plant Biology Institute of Biology Programa de Pós Graduação em Ecologia University of Campinas Campinas Brazil
| | - Manuel J. Marca Zevallos
- Universidad Nacional de San Antonio Abad del Cusco Cusco Peru
- Pontificia Universidad Católica del Perú Lima Perú
| | | | - Alex Nina
- Pontificia Universidad Católica del Perú Lima Perú
| | - Mauro Brum
- Department of Plant Biology Institute of Biology Programa de Pós Graduação em Ecologia University of Campinas Campinas Brazil
- Department of Ecology and Evolutionary Biology University of Arizona Tucson AZ USA
| | | | - Eric G. Cosio
- Sección Química Pontificia Universidad Católica del Perú Lima Peru
| | - Yadvinder Malhi
- Environmental Change Institute School of Geography and the Environment University of Oxford Oxford UK
| | | | | | - Lucy Rowland
- Geography College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Norma Salinas
- Sección Química Pontificia Universidad Católica del Perú Lima Peru
- Environmental Change Institute School of Geography and the Environment University of Oxford Oxford UK
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16
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Zucker A, Karwowski P, Urso M, Bustamante G, Lugo D, Rowland L, Kao J. A Prospective Trial of Clinical Intuition to Predict Survival in Patients With Metastatic Cancer Referred to Radiation Oncology. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.1361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Silveira FAO, Ordóñez‐Parra CA, Moura LC, Schmidt IB, Andersen AN, Bond W, Buisson E, Durigan G, Fidelis A, Oliveira RS, Parr C, Rowland L, Veldman JW, Pennington RT. Biome Awareness Disparity is BAD for tropical ecosystem conservation and restoration. J Appl Ecol 2021. [DOI: 10.1111/1365-2664.14060] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernando A. O. Silveira
- Department of Genetics, Ecology and Evolution Federal University of Minas Gerais Belo Horizonte Brazil
| | - Carlos A. Ordóñez‐Parra
- Department of Genetics, Ecology and Evolution Federal University of Minas Gerais Belo Horizonte Brazil
| | - Livia C. Moura
- Institute Society, Population and Nature Brasília Brazil
| | | | - Alan N. Andersen
- Research Institute for the Environment and LivelihoodsCharles Darwin University Darwin NT Australia
| | - William Bond
- Department of Biological Sciences University of Cape Town Cape Town South Africa
| | - Elise Buisson
- Institut Méditerranéen de Biodiversité et d'EcologieCNRSIRDAix Marseille UniversitéAvignon UniversitéIUT d'Avignon Avignon France
| | | | - Alessandra Fidelis
- Lab of Vegetation Ecology Universidade Estadual Paulista (UNESP) Rio Claro Brazil
| | | | - Catherine Parr
- School of Environmental Sciences University of Liverpool Liverpool UK
- Department of Zoology & Entomology University of Pretoria Pretoria South Africa
- School of Animal Plant & Environmental Sciences University of the Witwatersrand Wits South Africa
| | - Lucy Rowland
- Department of Geography College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Joseph W. Veldman
- Department of Ecology and Conservation Biology Texas A&M University College Station TX USA
| | - R. Toby Pennington
- School of Environmental Sciences University of Liverpool Liverpool UK
- Royal Botanic Garden Edinburgh Edinburgh UK
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18
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Giles AL, Costa PDB, Rowland L, Abrahão A, Lobo L, Verona L, Silva MC, Monge M, Wolfsdorf G, Petroni A, D'Angioli AM, Sampaio AB, Schimidt IB, Oliveira RS. How effective is direct seeding to restore the functional composition of neotropical savannas? Restor Ecol 2021. [DOI: 10.1111/rec.13474] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- André Luiz Giles
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - Patrícia de Britto Costa
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
- School of Plant Biology The University of Western Australia Perth WA Australia
| | - Lucy Rowland
- College of Life and Environmental Sciences University of Exeter Exeter U.K
| | - Anna Abrahão
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
- Institute of Soil Science and Land Evaluation, Soil Biology Department University of Hohenheim Emil‐Wolff‐Strasse Stuttgart 27 Germany
| | - Luisa Lobo
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - Larissa Verona
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - Mateus Cardoso Silva
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
- College of Life and Environmental Sciences University of Exeter Exeter U.K
| | - Marcelo Monge
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
- HUFU‐Herbarium, Institute of Biology Federal University of Uberlândia UFU Uberlândia MG 38400‐902 Brazil
| | - Gabriel Wolfsdorf
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - Amanda Petroni
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | - André M. D'Angioli
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
| | | | | | - Rafael S. Oliveira
- Department of Plant Biology Institute of Biology P.O. Box: 6109, University of Campinas – UNICAMP 13083‐970 Campinas SP Brazil
- School of Plant Biology The University of Western Australia Perth WA Australia
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19
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Wolfsdorf G, Abrahão A, D'Angioli AM, de Sá Dechoum M, Meirelles ST, F. L. Pecoral L, Rowland L, da Silveira Verona L, B. Schmidt I, B. Sampaio A, S. Oliveira R. Inoculum origin and soil legacy can shape plant–soil feedback outcomes for tropical grassland restoration. Restor Ecol 2021. [DOI: 10.1111/rec.13455] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Gabriel Wolfsdorf
- Departamento de Biologia Vegetal Universidade Estadual de Campinas 6109 Campinas SP Brazil
- Programa de Pós‐Graduação em Ecologia Universidade Estadual de Campinas Campinas SP Brazil
| | - Anna Abrahão
- Programa de Pós‐Graduação em Biologia Vegetal Universidade Estadual de Campinas Campinas SP Brazil
- Department of Soil Biology Institute of Soil Science and Land Evaluation, University of Hohenheim 70599 Stuttgart Germany
| | - André M. D'Angioli
- Departamento de Biologia Vegetal Universidade Estadual de Campinas 6109 Campinas SP Brazil
- Programa de Pós‐Graduação em Ecologia Universidade Estadual de Campinas Campinas SP Brazil
| | - Michele de Sá Dechoum
- Department of Ecology and Zoology Federal University of Santa Catarina Florianópolis SC 88040‐900 Brazil
| | | | - Luísa F. L. Pecoral
- Departamento de Biologia Vegetal Universidade Estadual de Campinas 6109 Campinas SP Brazil
| | - Lucy Rowland
- College of Life and Environmental Sciences University of Exeter Exeter EX4 4RJ U.K
| | | | - Isabel B. Schmidt
- Ecology Department University of Brasília, Campus Universitário Darcy Ribeiro Brasília DF 70910‐900 Brazil
| | - Alexandre B. Sampaio
- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado Instituto Chico Mendes de Conservação da Biodiversidade—ICMBio Brasília DF Brazil
| | - Rafael S. Oliveira
- Departamento de Biologia Vegetal Universidade Estadual de Campinas 6109 Campinas SP Brazil
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20
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Rowland L, Martínez-Vilalta J, Mencuccini M. Hard times for high expectations from hydraulics: predicting drought-induced forest mortality at landscape scales remains a challenge. New Phytol 2021; 230:1685-1687. [PMID: 33797779 DOI: 10.1111/nph.17317] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Affiliation(s)
- Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4QE, UK
| | - Jordi Martínez-Vilalta
- CREAF, Bellaterra (Cerdanyola del Vallès), 08193, Spain
- Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), 08193, Spain
| | - Maurizio Mencuccini
- CREAF, Bellaterra (Cerdanyola del Vallès), 08193, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona, 08010, Spain
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21
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Burt A, Boni Vicari M, da Costa ACL, Coughlin I, Meir P, Rowland L, Disney M. New insights into large tropical tree mass and structure from direct harvest and terrestrial lidar. R Soc Open Sci 2021; 8:201458. [PMID: 33972856 PMCID: PMC8074798 DOI: 10.1098/rsos.201458] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
A large portion of the terrestrial vegetation carbon stock is stored in the above-ground biomass (AGB) of tropical forests, but the exact amount remains uncertain, partly owing to the lack of measurements. To date, accessible peer-reviewed data are available for just 10 large tropical trees in the Amazon that have been harvested and directly measured entirely via weighing. Here, we harvested four large tropical rainforest trees (stem diameter: 0.6-1.2 m, height: 30-46 m, AGB: 3960-18 584 kg) in intact old-growth forest in East Amazonia, and measured above-ground green mass, moisture content and woody tissue density. We first present rare ecological insights provided by these data, including unsystematic intra-tree variations in density, with both height and radius. We also found the majority of AGB was usually found in the crown, but varied from 42 to 62%. We then compare non-destructive approaches for estimating the AGB of these trees, using both classical allometry and new lidar-based methods. Terrestrial lidar point clouds were collected pre-harvest, on which we fitted cylinders to model woody structure, enabling retrieval of volume-derived AGB. Estimates from this approach were more accurate than allometric counterparts (mean tree-scale relative error: 3% versus 15%), and error decreased when up-scaling to the cumulative AGB of the four trees (1% versus 15%). Furthermore, while allometric error increased fourfold with tree size over the diameter range, lidar error remained constant. This suggests error in these lidar-derived estimates is random and additive. Were these results transferable across forest scenes, terrestrial lidar methods would reduce uncertainty in stand-scale AGB estimates, and therefore advance our understanding of the role of tropical forests in the global carbon cycle.
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Affiliation(s)
- Andrew Burt
- Department of Geography, University College London, London, UK
| | | | | | - Ingrid Coughlin
- Research School of Biology, Australian National University, Canberra, Australia
| | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, Australia
- School of GeoSciences, University of Edinburgh, Edinburgh, UK
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Mathias Disney
- Department of Geography, University College London, London, UK
- NERC National Centre for Earth Observation (NCEO), Leicester, UK
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22
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Rowland L, Oliveira RS, Bittencourt PRL, Giles AL, Coughlin I, Costa PDB, Domingues T, Ferreira LV, Vasconcelos SS, Junior JAS, Oliveira AAR, da Costa ACL, Meir P, Mencuccini M. Plant traits controlling growth change in response to a drier climate. New Phytol 2021; 229:1363-1374. [PMID: 32981040 DOI: 10.1111/nph.16972] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
Plant traits are increasingly being used to improve prediction of plant function, including plant demography. However, the capability of plant traits to predict demographic rates remains uncertain, particularly in the context of trees experiencing a changing climate. Here we present data combining 17 plant traits associated with plant structure, metabolism and hydraulic status, with measurements of long-term mean, maximum and relative growth rates for 176 trees from the world's longest running tropical forest drought experiment. We demonstrate that plant traits can predict mean annual tree growth rates with moderate explanatory power. However, only combinations of traits associated more directly with plant functional processes, rather than more commonly employed traits like wood density or leaf mass per area, yield the power to predict growth. Critically, we observe a shift from growth being controlled by traits related to carbon cycling (assimilation and respiration) in well-watered trees, to traits relating to plant hydraulic stress in drought-stressed trees. We also demonstrate that even with a very comprehensive set of plant traits and growth data on large numbers of tropical trees, considerable uncertainty remains in directly interpreting the mechanisms through which traits influence performance in tropical forests.
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Affiliation(s)
- Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, UK
| | - Rafael S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, SP, 13083-970, Brasil
- Biological Sciences, UWA, Perth, Crawle, WA, 6009, Australia
| | - Paulo R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, UK
- Programa de Pós Graduação em Ecologia Institute of Biology, University of Campinas - UNICAMP 13083-970, PO Box 6109, Campinas, SP, Brazil
| | - Andre L Giles
- Programa de Pós Graduação em Ecologia Institute of Biology, University of Campinas - UNICAMP 13083-970, PO Box 6109, Campinas, SP, Brazil
| | - Ingrid Coughlin
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto, SP, 14040-900, Brasil
- Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Patricia de Britto Costa
- Biological Sciences, UWA, Perth, Crawle, WA, 6009, Australia
- Programa de Pós Graduação em Biologia Vegetal Institute of Biology, University of Campinas - UNICAMP, PO Box 6109, Campinas, SP, 13083-970, Brazil
| | - Tomas Domingues
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto, SP, 14040-900, Brasil
| | | | | | - João A S Junior
- Instituto de Geosciências, Universidade Federal do Pará, Belém, PA, 66075-110, Brasil
| | - Alex A R Oliveira
- School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3FF, UK
| | - Antonio C L da Costa
- Museu Paraense Emílio Goeldi, Belém, PA, 66040-170, Brasil
- EMBRAPA Amazônia Oriental, 14 Belém, PA, 66095-903, Brasil
| | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
- School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3FF, UK
| | - Maurizio Mencuccini
- CREAF, Campus UAB, Cerdanyola del Vallés, 08193, Spain
- ICREA, Barcelona, 08010, Spain
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23
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Rowland L, Costa ACL, Oliveira RS, Bittencourt PRL, Giles AL, Coughlin I, Britto Costa P, Bartholomew D, Domingues TF, Miatto RC, Ferreira LV, Vasconcelos SS, Junior JAS, Oliveira AAR, Mencuccini M, Meir P. The response of carbon assimilation and storage to long‐term drought in tropical trees is dependent on light availability. Funct Ecol 2020. [DOI: 10.1111/1365-2435.13689] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Lucy Rowland
- Department of Geography College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Antonio C. L. Costa
- Instituto de Geosciências Universidade Federal do Pará Belém Brazil
- Museu Paraense Emílio Goeldi Coordenação de Ciências da Terra e Ecologia Belém Brazil
| | | | - Paulo R. L. Bittencourt
- Department of Geography College of Life and Environmental Sciences University of Exeter Exeter UK
- Instituto de Biologia University of Campinas (UNICAMP) Campinas Brazil
| | - André L. Giles
- Instituto de Biologia University of Campinas (UNICAMP) Campinas Brazil
- Programa de Pós Graduação em Biologia Vegetal Institute of BiologyUniversity of Campinas – UNICAMP Campinas Brazil
| | - Ingrid Coughlin
- Departamento de Biologia FFCLRPUniversidade de São Paulo Ribeirão Preto Brazil
- Research School of Biology Australian National University Canberra ACT Australia
| | - Patricia Britto Costa
- Instituto de Biologia University of Campinas (UNICAMP) Campinas Brazil
- Programa de Pós Graduação em Biologia Vegetal Institute of BiologyUniversity of Campinas – UNICAMP Campinas Brazil
| | - David Bartholomew
- Department of Geography College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Tomas F. Domingues
- Departamento de Biologia FFCLRPUniversidade de São Paulo Ribeirão Preto Brazil
| | - Raquel C. Miatto
- Departamento de Biologia FFCLRPUniversidade de São Paulo Ribeirão Preto Brazil
| | - Leandro V. Ferreira
- Museu Paraense Emílio Goeldi Coordenação de Ciências da Terra e Ecologia Belém Brazil
| | | | | | - Alex A. R. Oliveira
- Research School of Biology Australian National University Canberra ACT Australia
| | | | - Patrick Meir
- Departamento de Biologia FFCLRPUniversidade de São Paulo Ribeirão Preto Brazil
- School of GeoSciences University of Edinburgh Edinburgh UK
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24
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Bartholomew DC, Bittencourt PRL, da Costa ACL, Banin LF, de Britto Costa P, Coughlin SI, Domingues TF, Ferreira LV, Giles A, Mencuccini M, Mercado L, Miatto RC, Oliveira A, Oliveira R, Meir P, Rowland L. Small tropical forest trees have a greater capacity to adjust carbon metabolism to long-term drought than large canopy trees. Plant Cell Environ 2020; 43:2380-2393. [PMID: 32643169 DOI: 10.1111/pce.13838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/30/2020] [Accepted: 07/01/2020] [Indexed: 06/11/2023]
Abstract
The response of small understory trees to long-term drought is vital in determining the future composition, carbon stocks and dynamics of tropical forests. Long-term drought is, however, also likely to expose understory trees to increased light availability driven by drought-induced mortality. Relatively little is known about the potential for understory trees to adjust their physiology to both decreasing water and increasing light availability. We analysed data on maximum photosynthetic capacity (Jmax , Vcmax ), leaf respiration (Rleaf ), leaf mass per area (LMA), leaf thickness and leaf nitrogen and phosphorus concentrations from 66 small trees across 12 common genera at the world's longest running tropical rainfall exclusion experiment and compared responses to those from 61 surviving canopy trees. Small trees increased Jmax , Vcmax , Rleaf and LMA (71, 29, 32, 15% respectively) in response to the drought treatment, but leaf thickness and leaf nutrient concentrations did not change. Small trees were significantly more responsive than large canopy trees to the drought treatment, suggesting greater phenotypic plasticity and resilience to prolonged drought, although differences among taxa were observed. Our results highlight that small tropical trees have greater capacity to respond to ecosystem level changes and have the potential to regenerate resilient forests following future droughts.
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Affiliation(s)
- David C Bartholomew
- School of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Paulo R L Bittencourt
- School of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | | | | | | | - Sarah I Coughlin
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Tomas F Domingues
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto, Brazil
| | | | - André Giles
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | - Maurizio Mencuccini
- ICREA, Barcelona, Spain
- CREAF, Universidad Autonoma de Barcelona, Barcelona, Spain
| | - Lina Mercado
- School of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- UK Centre for Ecology and Hydrology, Wallingford, UK
| | - Raquel C Miatto
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto, Brazil
| | | | - Rafael Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - Lucy Rowland
- School of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
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25
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Bittencourt PRL, Oliveira RS, da Costa ACL, Giles AL, Coughlin I, Costa PB, Bartholomew DC, Ferreira LV, Vasconcelos SS, Barros FV, Junior JAS, Oliveira AAR, Mencuccini M, Meir P, Rowland L. Amazonia trees have limited capacity to acclimate plant hydraulic properties in response to long-term drought. Glob Chang Biol 2020; 26:3569-3584. [PMID: 32061003 DOI: 10.1111/gcb.15040] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 12/30/2019] [Accepted: 02/02/2020] [Indexed: 05/29/2023]
Abstract
The fate of tropical forests under future climate change is dependent on the capacity of their trees to adjust to drier conditions. The capacity of trees to withstand drought is likely to be determined by traits associated with their hydraulic systems. However, data on whether tropical trees can adjust hydraulic traits when experiencing drought remain rare. We measured plant hydraulic traits (e.g. hydraulic conductivity and embolism resistance) and plant hydraulic system status (e.g. leaf water potential, native embolism and safety margin) on >150 trees from 12 genera (36 species) and spanning a stem size range from 14 to 68 cm diameter at breast height at the world's only long-running tropical forest drought experiment. Hydraulic traits showed no adjustment following 15 years of experimentally imposed moisture deficit. This failure to adjust resulted in these drought-stressed trees experiencing significantly lower leaf water potentials, and higher, but variable, levels of native embolism in the branches. This result suggests that hydraulic damage caused by elevated levels of embolism is likely to be one of the key drivers of drought-induced mortality following long-term soil moisture deficit. We demonstrate that some hydraulic traits changed with tree size, however, the direction and magnitude of the change was controlled by taxonomic identity. Our results suggest that Amazonian trees, both small and large, have limited capacity to acclimate their hydraulic systems to future droughts, potentially making them more at risk of drought-induced mortality.
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Affiliation(s)
- Paulo R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | - Rafael S Oliveira
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
- Biological Sciences, UWA, Perth, WA, Australia
| | | | - Andre L Giles
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | - Ingrid Coughlin
- Departamento de Biologia, FFCLRP, Universidade de São Paulo, Ribeirão Preto, Brazil
- Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Patricia B Costa
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
- Biological Sciences, UWA, Perth, WA, Australia
| | - David C Bartholomew
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | | | - Fernanda V Barros
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | - Joao A S Junior
- Instituto de Biologia, University of Campinas (UNICAMP), Campinas, Brazil
| | | | | | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, ACT, Australia
- School of GeoSciences, University of Edinburgh, Edinburgh, UK
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
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26
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Eller CB, Rowland L, Mencuccini M, Rosas T, Williams K, Harper A, Medlyn BE, Wagner Y, Klein T, Teodoro GS, Oliveira RS, Matos IS, Rosado BHP, Fuchs K, Wohlfahrt G, Montagnani L, Meir P, Sitch S, Cox PM. Stomatal optimization based on xylem hydraulics (SOX) improves land surface model simulation of vegetation responses to climate. New Phytol 2020; 226:1622-1637. [PMID: 31916258 PMCID: PMC7318565 DOI: 10.1111/nph.16419] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 01/03/2020] [Indexed: 05/23/2023]
Abstract
Land surface models (LSMs) typically use empirical functions to represent vegetation responses to soil drought. These functions largely neglect recent advances in plant ecophysiology that link xylem hydraulic functioning with stomatal responses to climate. We developed an analytical stomatal optimization model based on xylem hydraulics (SOX) to predict plant responses to drought. Coupling SOX to the Joint UK Land Environment Simulator (JULES) LSM, we conducted a global evaluation of SOX against leaf- and ecosystem-level observations. SOX simulates leaf stomatal conductance responses to climate for woody plants more accurately and parsimoniously than the existing JULES stomatal conductance model. An ecosystem-level evaluation at 70 eddy flux sites shows that SOX decreases the sensitivity of gross primary productivity (GPP) to soil moisture, which improves the model agreement with observations and increases the predicted annual GPP by 30% in relation to JULES. SOX decreases JULES root-mean-square error in GPP by up to 45% in evergreen tropical forests, and can simulate realistic patterns of canopy water potential and soil water dynamics at the studied sites. SOX provides a parsimonious way to incorporate recent advances in plant hydraulics and optimality theory into LSMs, and an alternative to empirical stress factors.
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Affiliation(s)
- Cleiton B. Eller
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4QFUK
- Department of Plant BiologyUniversity of CampinasCampinas13083‐862Brazil
| | - Lucy Rowland
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4QFUK
| | - Maurizio Mencuccini
- CREAFBellaterra08193BarcelonaSpain
- ICREAPg. Lluís Companys 2308010BarcelonaSpain
| | - Teresa Rosas
- CREAFBellaterra08193BarcelonaSpain
- ICREAPg. Lluís Companys 2308010BarcelonaSpain
| | | | - Anna Harper
- College of Engineering, Mathematics and Physical SciencesUniversity of ExeterExeterEX4 4QFUK
| | - Belinda E. Medlyn
- Hawkesbury Institute for the EnvironmentWestern Sydney UniversityLocked Bag 1797PenrithNSW2751Australia
| | - Yael Wagner
- Department of Plant & Environmental SciencesWeizmann Institute of Science76100RehovotIsrael
| | - Tamir Klein
- Department of Plant & Environmental SciencesWeizmann Institute of Science76100RehovotIsrael
| | | | - Rafael S. Oliveira
- Department of Plant BiologyUniversity of CampinasCampinas13083‐862Brazil
| | - Ilaine S. Matos
- Department of Ecology – IBRAGRio de Janeiro State University (UERJ)Rio de Janeiro20550‐013Brazil
| | - Bruno H. P. Rosado
- Department of Ecology – IBRAGRio de Janeiro State University (UERJ)Rio de Janeiro20550‐013Brazil
| | - Kathrin Fuchs
- Department of Environmental Systems ScienceETH ZurichUniversitätstrasse 28092ZurichSwitzerland
| | - Georg Wohlfahrt
- Department of EcologyUniversity of InnsbruckInnsbruck6020Austria
| | - Leonardo Montagnani
- Forest ServicesAutonomous Province of BolzanoVia Brennero 639100BolzanoItaly
| | - Patrick Meir
- Research School of BiologyThe Australian National UniversityActonACT2601Australia
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3FFUK
| | - Stephen Sitch
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4QFUK
| | - Peter M. Cox
- College of Engineering, Mathematics and Physical SciencesUniversity of ExeterExeterEX4 4QFUK
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Pereira L, Bittencourt PRL, Pacheco VS, Miranda MT, Zhang Y, Oliveira RS, Groenendijk P, Machado EC, Tyree MT, Jansen S, Rowland L, Ribeiro RV. The Pneumatron: An automated pneumatic apparatus for estimating xylem vulnerability to embolism at high temporal resolution. Plant Cell Environ 2020; 43:131-142. [PMID: 31461536 DOI: 10.1111/pce.13647] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 08/16/2019] [Accepted: 08/20/2019] [Indexed: 05/29/2023]
Abstract
Xylem vulnerability to embolism represents an important trait to determine species distribution patterns and drought resistance. However, estimating embolism resistance frequently requires time-consuming and ambiguous hydraulic lab measurements. Based on a recently developed pneumatic method, we present and test the "Pneumatron", a device that generates high time-resolution and fully automated vulnerability curves. Embolism resistance is estimated by applying a partial vacuum to extract air from an excised xylem sample, while monitoring the pressure change over time. Although the amount of gas extracted is strongly correlated with the percentage loss of xylem conductivity, validation of the Pneumatron was performed by comparison with the optical method for Eucalyptus camaldulensis leaves. The Pneumatron improved the precision of the pneumatic method considerably, facilitating the detection of small differences in the (percentage of air discharged [PAD] < 0.47%). Hence, the Pneumatron can directly measure the 50% PAD without any fitting of vulnerability curves. PAD and embolism frequency based on the optical method were strongly correlated (r2 = 0.93) for E. camaldulensis. By providing an open source platform, the Pneumatron represents an easy, low-cost, and powerful tool for field measurements, which can significantly improve our understanding of plant-water relations and the mechanisms behind embolism.
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Affiliation(s)
- Luciano Pereira
- Laboratory of Plant Physiology "Coaracy M. Franco", Center R&D in Ecophysiology and Biophysics, Agronomic Institute (IAC), Campinas, Brazil
- Laboratory of Crop Physiology, Department of Plant Biology, Institute of Biology, P.O. Box 6109, University of Campinas (UNICAMP), Campinas, 13083-970, Brazil
| | - Paulo R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom
- Department of Plant Biology, Institute of Biology, P.O. Box 6109, UNICAMP, Campinas, 13083-970, Brazil
| | - Vinícius S Pacheco
- Department of Plant Biology, Institute of Biology, P.O. Box 6109, UNICAMP, Campinas, 13083-970, Brazil
| | - Marcela T Miranda
- Laboratory of Plant Physiology "Coaracy M. Franco", Center R&D in Ecophysiology and Biophysics, Agronomic Institute (IAC), Campinas, Brazil
| | - Ya Zhang
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, 89081, Germany
| | - Rafael S Oliveira
- Department of Plant Biology, Institute of Biology, P.O. Box 6109, UNICAMP, Campinas, 13083-970, Brazil
| | - Peter Groenendijk
- Department of Plant Biology, Institute of Biology, P.O. Box 6109, UNICAMP, Campinas, 13083-970, Brazil
| | - Eduardo C Machado
- Laboratory of Plant Physiology "Coaracy M. Franco", Center R&D in Ecophysiology and Biophysics, Agronomic Institute (IAC), Campinas, Brazil
| | - Melvin T Tyree
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, 321004, China
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Ulm, 89081, Germany
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom
| | - Rafael V Ribeiro
- Laboratory of Crop Physiology, Department of Plant Biology, Institute of Biology, P.O. Box 6109, University of Campinas (UNICAMP), Campinas, 13083-970, Brazil
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28
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Mencuccini M, Rosas T, Rowland L, Choat B, Cornelissen H, Jansen S, Kramer K, Lapenis A, Manzoni S, Niinemets Ü, Reich P, Schrodt F, Soudzilovskaia N, Wright IJ, Martínez-Vilalta J. Leaf economics and plant hydraulics drive leaf : wood area ratios. New Phytol 2019; 224:1544-1556. [PMID: 31215647 DOI: 10.1111/nph.15998] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 06/08/2019] [Indexed: 06/09/2023]
Abstract
Biomass and area ratios between leaves, stems and roots regulate many physiological and ecological processes. The Huber value Hv (sapwood area/leaf area ratio) is central to plant water balance and drought responses. However, its coordination with key plant functional traits is poorly understood, and prevents developing trait-based prediction models. Based on theoretical arguments, we hypothesise that global patterns in Hv of terminal woody branches can be predicted from variables related to plant trait spectra, that is plant hydraulics and size and leaf economics. Using a global compilation of 1135 species-averaged Hv , we show that Hv varies over three orders of magnitude. Higher Hv are seen in short small-leaved low-specific leaf area (SLA) shrubs with low Ks in arid relative to tall large-leaved high-SLA trees with high Ks in moist environments. All traits depend on climate but climatic correlations are stronger for explanatory traits than Hv . Negative isometry is found between Hv and Ks , suggesting a compensation to maintain hydraulic supply to leaves across species. This work identifies the major global drivers of branch sapwood/leaf area ratios. Our approach based on widely available traits facilitates the development of accurate models of above-ground biomass allocation and helps predict vegetation responses to drought.
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Affiliation(s)
- Maurizio Mencuccini
- CREAF, Bellaterra, 08193, Barcelona, Spain
- ICREA, Pg. Lluís Companys 23, 08010, Barcelona, Spain
| | - Teresa Rosas
- CREAF, Bellaterra, 08193, Barcelona, Spain
- Universitat Autònoma de Barcelona, Bellaterra, 08193, Barcelona, Spain
| | - Lucy Rowland
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, EX4 4QE, Exeter, UK
| | - Brendan Choat
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, 2751, NSW, Australia
| | - Hans Cornelissen
- Systems Ecology, Department of Ecological Science, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, the Netherlands
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Koen Kramer
- Wageningen University and Research, Droevendaalsesteeg 1, 6700 AA, Wageningen, the Netherlands
| | - Andrei Lapenis
- Department of Geography, New York State University at Albany, Albany, NY, 12222, USA
| | - Stefano Manzoni
- Physical Geography, Stockholm University, SE-10691, Stockholm, Sweden
- Bolin Centre for Climate Research, Stockholm University, SE-10691, Stockholm, Sweden
| | - Ülo Niinemets
- Estonian University of Life Science, Kreutzwladi 1, 51006, Tartu, Estonia
- Estonian Academy of Sciences, Kohtu 6, 10130, Tallinn, Estonia
| | - Peter Reich
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, 2751, NSW, Australia
- Department of Forest Resources, University of Minnesota, St Paul, MN, 55108, USA
| | - Franziska Schrodt
- School of Geography, University of Nottingham, NG7 2RD, Nottingham, UK
| | - Nadia Soudzilovskaia
- Institute of Environmental Sciences, CML, Leiden University, Einsteinweg 2, 2333 CC, Leiden, the Netherlands
| | - Ian J Wright
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Jordi Martínez-Vilalta
- CREAF, Bellaterra, 08193, Barcelona, Spain
- Universitat Autònoma de Barcelona, Bellaterra, 08193, Barcelona, Spain
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Harrison ME, Ottay JB, D’Arcy LJ, Cheyne SM, Anggodo, Belcher C, Cole L, Dohong A, Ermiasi Y, Feldpausch T, Gallego‐Sala A, Gunawan A, Höing A, Husson SJ, Kulu IP, Soebagio SM, Mang S, Mercado L, Morrogh‐Bernard HC, Page SE, Priyanto R, Ripoll Capilla B, Rowland L, Santos EM, Schreer V, Sudyana IN, Taman SBB, Thornton SA, Upton C, Wich SA, Veen FJF. Tropical forest and peatland conservation in Indonesia: Challenges and directions. People and Nature 2019. [DOI: 10.1002/pan3.10060] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Mark E. Harrison
- Borneo Nature Foundation Palangka Raya Indonesia
- School of Geography, Geology and the Environment University of Leicester Leicester UK
| | | | - Laura J. D’Arcy
- Borneo Nature Foundation Palangka Raya Indonesia
- Zoological Society of London (ZSL) London UK
| | - Susan M. Cheyne
- Borneo Nature Foundation Palangka Raya Indonesia
- Oxford Brookes University Oxford UK
| | - Anggodo
- Sebangau National Park Office Palangka Raya Indonesia
| | - Claire Belcher
- School of Geography College of Life and Environmental Science University of Exeter Exeter UK
| | - Lydia Cole
- School of Geography and Sustainable Development University of St Andrews St Andrews UK
| | - Alue Dohong
- Peatland Restoration Agency Jakarta Indonesia
- University of Palangka Raya Palangka Raya Indonesia
| | | | - Ted Feldpausch
- School of Geography College of Life and Environmental Science University of Exeter Exeter UK
| | - Angela Gallego‐Sala
- School of Geography College of Life and Environmental Science University of Exeter Exeter UK
| | - Adib Gunawan
- Nature Conservation Agency Central Kalimantan (BSKDA KALTENG)Palangka Raya Indonesia
| | - Andrea Höing
- Borneo Nature Foundation Palangka Raya Indonesia
- Institute of Oriental and Asian Studies Rheinische Friedrich‐Wilhems‐Universität Bonn Bonn Germany
| | | | - Ici P. Kulu
- UPT CIMTROP University of Palangka Raya Palangka Raya Indonesia
| | | | - Shari Mang
- Borneo Nature Foundation Palangka Raya Indonesia
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
| | - Lina Mercado
- School of Geography College of Life and Environmental Science University of Exeter Exeter UK
| | - Helen C. Morrogh‐Bernard
- Borneo Nature Foundation Palangka Raya Indonesia
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
| | - Susan E. Page
- Borneo Nature Foundation Palangka Raya Indonesia
- School of Geography, Geology and the Environment University of Leicester Leicester UK
| | | | | | - Lucy Rowland
- School of Geography College of Life and Environmental Science University of Exeter Exeter UK
| | - Eduarda M. Santos
- Environmental Biology Research Group College of Life and Environmental Sciences University of Exeter Exeter UK
| | | | | | | | - Sara A. Thornton
- Borneo Nature Foundation Palangka Raya Indonesia
- School of Geography, Geology and the Environment University of Leicester Leicester UK
| | - Caroline Upton
- School of Geography, Geology and the Environment University of Leicester Leicester UK
| | | | - F. J. Frank Veen
- Centre for Ecology and Conservation College of Life and Environmental Sciences University of Exeter Penryn UK
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30
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Binks O, Mencuccini M, Rowland L, da Costa ACL, de Carvalho CJR, Bittencourt P, Eller C, Teodoro GS, Carvalho EJM, Soza A, Ferreira L, Vasconcelos SS, Oliveira R, Meir P. Foliar water uptake in Amazonian trees: Evidence and consequences. Glob Chang Biol 2019; 25:2678-2690. [PMID: 31012521 DOI: 10.1111/gcb.14666] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 04/05/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
The absorption of atmospheric water directly into leaves enables plants to alleviate the water stress caused by low soil moisture, hydraulic resistance in the xylem and the effect of gravity on the water column, while enabling plants to scavenge small inputs of water from leaf-wetting events. By increasing the availability of water, and supplying it from the top of the canopy (in a direction facilitated by gravity), foliar uptake (FU) may be a significant process in determining how forests interact with climate, and could alter our interpretation of current metrics for hydraulic stress and sensitivity. FU has not been reported for lowland tropical rainforests; we test whether FU occurs in six common Amazonian tree genera in lowland Amazônia, and make a first estimation of its contribution to canopy-atmosphere water exchange. We demonstrate that FU occurs in all six genera and that dew-derived water may therefore be used to "pay" for some morning transpiration in the dry season. Using meteorological and canopy wetness data, coupled with empirically derived estimates of leaf conductance to FU (kfu ), we estimate that the contribution by FU to annual transpiration at this site has a median value of 8.2% (103 mm/year) and an interquartile range of 3.4%-15.3%, with the biggest sources of uncertainty being kfu and the proportion of time the canopy is wet. Our results indicate that FU is likely to be a common strategy and may have significant implications for the Amazon carbon budget. The process of foliar water uptake may also have a profound impact on the drought tolerance of individual Amazonian trees and tree species, and on the cycling of water and carbon, regionally and globally.
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Affiliation(s)
- Oliver Binks
- Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia
| | | | - Lucy Rowland
- Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | | | - Paulo Bittencourt
- Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Cleiton Eller
- Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | | | - Azul Soza
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
| | | | | | - Rafael Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas, Campinas, Brazil
| | - Patrick Meir
- Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, Australia
- School of Geosciences, University of Edinburgh, Edinburgh, UK
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31
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Eller CB, Rowland L, Oliveira RS, Bittencourt PRL, Barros FV, da Costa ACL, Meir P, Friend AD, Mencuccini M, Sitch S, Cox P. Modelling tropical forest responses to drought and El Niño with a stomatal optimization model based on xylem hydraulics. Philos Trans R Soc Lond B Biol Sci 2018; 373:20170315. [PMID: 30297470 PMCID: PMC6178424 DOI: 10.1098/rstb.2017.0315] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2018] [Indexed: 11/12/2022] Open
Abstract
The current generation of dynamic global vegetation models (DGVMs) lacks a mechanistic representation of vegetation responses to soil drought, impairing their ability to accurately predict Earth system responses to future climate scenarios and climatic anomalies, such as El Niño events. We propose a simple numerical approach to model plant responses to drought coupling stomatal optimality theory and plant hydraulics that can be used in dynamic global vegetation models (DGVMs). The model is validated against stand-scale forest transpiration (E) observations from a long-term soil drought experiment and used to predict the response of three Amazonian forest sites to climatic anomalies during the twentieth century. We show that our stomatal optimization model produces realistic stomatal responses to environmental conditions and can accurately simulate how tropical forest E responds to seasonal, and even long-term soil drought. Our model predicts a stronger cumulative effect of climatic anomalies in Amazon forest sites exposed to soil drought during El Niño years than can be captured by alternative empirical drought representation schemes. The contrasting responses between our model and empirical drought factors highlight the utility of hydraulically-based stomatal optimization models to represent vegetation responses to drought and climatic anomalies in DGVMs.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.
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Affiliation(s)
- Cleiton B Eller
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Rafael S Oliveira
- Department of Plant Biology, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Paulo R L Bittencourt
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- Department of Plant Biology, Institute of Biology, UNICAMP, Campinas, Brazil
| | - Fernanda V Barros
- Department of Plant Biology, Institute of Biology, UNICAMP, Campinas, Brazil
| | | | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, Australia
- School of GeoSciences, University of Edinburgh, Edinburgh, UK
| | - Andrew D Friend
- Department of Geography, University of Cambridge, Cambridge, UK
| | | | - Stephen Sitch
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - Peter Cox
- College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK
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32
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Meir P, Mencuccini M, Binks O, da Costa AL, Ferreira L, Rowland L. Short-term effects of drought on tropical forest do not fully predict impacts of repeated or long-term drought: gas exchange versus growth. Philos Trans R Soc Lond B Biol Sci 2018; 373:20170311. [PMID: 30297468 PMCID: PMC6178433 DOI: 10.1098/rstb.2017.0311] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2018] [Indexed: 11/12/2022] Open
Abstract
Are short-term responses by tropical rainforest to drought (e.g. during El Niño) sufficient to predict changes over the long-term, or from repeated drought? Using the world's only long-term (16-year) drought experiment in tropical forest we examine predictability from short-term measurements (1-2 years). Transpiration was maximized in droughted forest: it consumed all available throughfall throughout the 16 years of study. Leaf photosynthetic capacity [Formula: see text] was maintained, but only when averaged across tree size groups. Annual transpiration in droughted forest was less than in control, with initial reductions (at high biomass) imposed by foliar stomatal control. Tree mortality increased after year three, leading to an overall biomass loss of 40%; over the long-term, the main constraint on transpiration was thus imposed by the associated reduction in sapwood area. Altered tree mortality risk may prove predictable from soil and plant hydraulics, but additional monitoring is needed to test whether future biomass will stabilize or collapse. Allocation of assimilate differed over time: stem growth and reproductive output declined in the short-term, but following mortality-related changes in resource availability, both showed long-term resilience, with partial or full recovery. Understanding and simulation of these phenomena and related trade-offs in allocation will advance more effectively through greater use of optimization and probabilistic modelling approaches.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.
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Affiliation(s)
- Patrick Meir
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
- School of Geosciences, University of Edinburgh, Kings Buildings, Mayfield Road, Edinburgh EH9 3FF, UK
| | - Maurizio Mencuccini
- CREAF, Campus UAB, Cerdanyola del Vallés 08193, Spain
- ICREA, Barcelona 08193, Spain
| | - Oliver Binks
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Antonio Lola da Costa
- Instituto de Geosciências, Universidade Federal do Pará, Belém, PA 66075-110, Brazil
| | | | - Lucy Rowland
- Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Exeter EX4 4RJ, UK
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33
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Malhi Y, Rowland L, Aragão LEOC, Fisher RA. New insights into the variability of the tropical land carbon cycle from the El Niño of 2015/2016. Philos Trans R Soc Lond B Biol Sci 2018; 373:rstb.2017.0298. [PMID: 30297460 DOI: 10.1098/rstb.2017.0298] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/14/2018] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, OX1 3QY, UK
| | - Lucy Rowland
- Department of Geography, University of Exeter College of Life and Environmental Sciences, Exeter EX4 4RJ, UK
| | - Luiz E O C Aragão
- National Institute for Space Research - INPE, São José dos Campos, Brazil.,University of Exeter, College of Life and Environmental Sciences, Exeter EX4 4RJ, UK
| | - Rosie A Fisher
- Climate and Global Dynamics. National Center for Atmospheric Research, Boulder, Colorado, 31500 USA
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34
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Rowland L, da Costa ACL, Oliveira AAR, Oliveira RS, Bittencourt PL, Costa PB, Giles AL, Sosa AI, Coughlin I, Godlee JL, Vasconcelos SS, Junior JAS, Ferreira LV, Mencuccini M, Meir P. Drought stress and tree size determine stem CO 2 efflux in a tropical forest. New Phytol 2018; 218:1393-1405. [PMID: 29397028 PMCID: PMC5969101 DOI: 10.1111/nph.15024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 12/22/2017] [Indexed: 05/10/2023]
Abstract
CO2 efflux from stems (CO2_stem ) accounts for a substantial fraction of tropical forest gross primary productivity, but the climate sensitivity of this flux remains poorly understood. We present a study of tropical forest CO2_stem from 215 trees across wet and dry seasons, at the world's longest running tropical forest drought experiment site. We show a 27% increase in wet season CO2_stem in the droughted forest relative to a control forest. This was driven by increasing CO2_stem in trees 10-40 cm diameter. Furthermore, we show that drought increases the proportion of maintenance to growth respiration in trees > 20 cm diameter, including large increases in maintenance respiration in the largest droughted trees, > 40 cm diameter. However, we found no clear taxonomic influence on CO2_stem and were unable to accurately predict how drought sensitivity altered ecosystem scale CO2_stem , due to substantial uncertainty introduced by contrasting methods previously employed to scale CO2_stem fluxes. Our findings indicate that under future scenarios of elevated drought, increases in CO2_stem may augment carbon losses, weakening or potentially reversing the tropical forest carbon sink. However, due to substantial uncertainties in scaling CO2_stem fluxes, stand-scale future estimates of changes in stem CO2 emissions remain highly uncertain.
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Affiliation(s)
- Lucy Rowland
- College of Life and Environmental SciencesUniversity of ExeterExeterEX4 4RJUK
| | | | | | | | | | | | | | - Azul I. Sosa
- Instituto de BiologiaUNICAMPCampinasSP13083‐970Brasil
| | - Ingrid Coughlin
- Departamento de BiologiaFFCLRPUniversidade de São PauloRibeirão PretoSP14040‐900Brasil
| | - John L. Godlee
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FFUK
| | | | - João A. S. Junior
- Instituto de GeosciênciasUniversidade Federal do ParáBelémPA66075‐110Brasil
| | | | | | - Patrick Meir
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FFUK
- Research School of BiologyAustralian National UniversityCanberraACT2601Australia
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35
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Eller CB, de V Barros F, Bittencourt PRL, Rowland L, Mencuccini M, Oliveira RS. Xylem hydraulic safety and construction costs determine tropical tree growth. Plant Cell Environ 2018; 41:548-562. [PMID: 29211923 DOI: 10.1111/pce.13106] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 11/17/2017] [Indexed: 05/25/2023]
Abstract
Faster growth in tropical trees is usually associated with higher mortality rates, but the mechanisms underlying this relationship are poorly understood. In this study, we investigate how tree growth patterns are linked with environmental conditions and hydraulic traits, by monitoring the cambial growth of 9 tropical cloud forest tree species coupled with numerical simulations using an optimization model. We find that fast-growing trees have lower xylem safety margins than slow-growing trees and this pattern is not necessarily linked to differences in stomatal behaviour or environmental conditions when growth occurs. Instead, fast-growing trees have xylem vessels that are more vulnerable to cavitation and lower density wood. We propose the growth - xylem vulnerability trade-off represents a wood hydraulic economics spectrum similar to the classic leaf economic spectrum, and show through numerical simulations that this trade-off can emerge from the coordination between growth rates, wood density, and xylem vulnerability to cavitation. Our results suggest that vulnerability to hydraulic failure might be related with the growth-mortality trade-off in tropical trees, determining important life history differences. These findings are important in furthering our understanding of xylem hydraulic functioning and its implications on plant carbon economy.
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Affiliation(s)
- Cleiton B Eller
- Department of Plant Biology, Institute of Biology, UNICAMP, 6109, Campinas, Brazil
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, EX4 4RJ, Exeter, UK
| | - Fernanda de V Barros
- Department of Plant Biology, Institute of Biology, UNICAMP, 6109, Campinas, Brazil
| | | | - Lucy Rowland
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, EX4 4RJ, Exeter, UK
| | - Maurizio Mencuccini
- ICREA, Pg. Lluís Companys 23, 08010, Barcelona, Spain
- CREAF, Cerdanyola del Valles, 08193, Barcelona, Spain
| | - Rafael S Oliveira
- Department of Plant Biology, Institute of Biology, UNICAMP, 6109, Campinas, Brazil
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36
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da Costa ACL, Rowland L, Oliveira RS, Oliveira AAR, Binks OJ, Salmon Y, Vasconcelos SS, Junior JAS, Ferreira LV, Poyatos R, Mencuccini M, Meir P. Stand dynamics modulate water cycling and mortality risk in droughted tropical forest. Glob Chang Biol 2018; 24:249-258. [PMID: 28752626 DOI: 10.1111/gcb.13851] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 06/09/2017] [Indexed: 05/25/2023]
Abstract
Transpiration from the Amazon rainforest generates an essential water source at a global and local scale. However, changes in rainforest function with climate change can disrupt this process, causing significant reductions in precipitation across Amazonia, and potentially at a global scale. We report the only study of forest transpiration following a long-term (>10 year) experimental drought treatment in Amazonian forest. After 15 years of receiving half the normal rainfall, drought-related tree mortality caused total forest transpiration to decrease by 30%. However, the surviving droughted trees maintained or increased transpiration because of reduced competition for water and increased light availability, which is consistent with increased growth rates. Consequently, the amount of water supplied as rainfall reaching the soil and directly recycled as transpiration increased to 100%. This value was 25% greater than for adjacent nondroughted forest. If these drought conditions were accompanied by a modest increase in temperature (e.g., 1.5°C), water demand would exceed supply, making the forest more prone to increased tree mortality.
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Affiliation(s)
| | - Lucy Rowland
- Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | | | - Oliver J Binks
- Research School of Biology, Australian National University, Canberra, Australia
| | - Yann Salmon
- Department of Physics, University of Helsinki, Helsinki, Finland
| | | | - João A S Junior
- Instituto de Geosciências, Universidade Federal do Pará, Belém, Brasil
| | | | - Rafael Poyatos
- CREAF, Campus UAB, Cerdanyola del Vallés, Spain
- Laboratory of Plant Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | | | - Patrick Meir
- Research School of Biology, Australian National University, Canberra, Australia
- School of GeoSciences, University of Edinburgh, Edinburgh, UK
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Esquivel-Muelbert A, Galbraith D, Dexter KG, Baker TR, Lewis SL, Meir P, Rowland L, Costa ACLD, Nepstad D, Phillips OL. Biogeographic distributions of neotropical trees reflect their directly measured drought tolerances. Sci Rep 2017; 7:8334. [PMID: 28827613 PMCID: PMC5567183 DOI: 10.1038/s41598-017-08105-8] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 07/10/2017] [Indexed: 11/09/2022] Open
Abstract
High levels of species diversity hamper current understanding of how tropical forests may respond to environmental change. In the tropics, water availability is a leading driver of the diversity and distribution of tree species, suggesting that many tropical taxa may be physiologically incapable of tolerating dry conditions, and that their distributions along moisture gradients can be used to predict their drought tolerance. While this hypothesis has been explored at local and regional scales, large continental-scale tests are lacking. We investigate whether the relationship between drought-induced mortality and distributions holds continentally by relating experimental and observational data of drought-induced mortality across the Neotropics to the large-scale bioclimatic distributions of 115 tree genera. Across the different experiments, genera affiliated to wetter climatic regimes show higher drought-induced mortality than dry-affiliated ones, even after controlling for phylogenetic relationships. This pattern is stronger for adult trees than for saplings or seedlings, suggesting that the environmental filters exerted by drought impact adult tree survival most strongly. Overall, our analysis of experimental, observational, and bioclimatic data across neotropical forests suggests that increasing moisture-stress is indeed likely to drive significant changes in floristic composition.
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Affiliation(s)
| | - David Galbraith
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
| | - Kyle G Dexter
- Royal Botanic Garden of Edinburgh, EH3 5LR, Edinburgh, UK
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - Timothy R Baker
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
| | - Simon L Lewis
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
- Department of Geography, University College London, London, UK
| | - Patrick Meir
- School of Geosciences, University of Edinburgh, Edinburgh, UK
- Research School of Biology, Australian National University, Canberra, Australia
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, UK
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Rowland L, Zaragoza‐Castells J, Bloomfield KJ, Turnbull MH, Bonal D, Burban B, Salinas N, Cosio E, Metcalfe DJ, Ford A, Phillips OL, Atkin OK, Meir P. Scaling leaf respiration with nitrogen and phosphorus in tropical forests across two continents. New Phytol 2017; 214:1064-1077. [PMID: 27159833 PMCID: PMC5412872 DOI: 10.1111/nph.13992] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 03/30/2016] [Indexed: 05/27/2023]
Abstract
Leaf dark respiration (Rdark ) represents an important component controlling the carbon balance in tropical forests. Here, we test how nitrogen (N) and phosphorus (P) affect Rdark and its relationship with photosynthesis using three widely separated tropical forests which differ in soil fertility. Rdark was measured on 431 rainforest canopy trees, from 182 species, in French Guiana, Peru and Australia. The variation in Rdark was examined in relation to leaf N and P content, leaf structure and maximum photosynthetic rates at ambient and saturating atmospheric CO2 concentration. We found that the site with the lowest fertility (French Guiana) exhibited greater rates of Rdark per unit leaf N, P and photosynthesis. The data from Australia, for which there were no phylogenetic overlaps with the samples from the South American sites, yielded the most distinct relationships of Rdark with the measured leaf traits. Our data indicate that no single universal scaling relationship accounts for variation in Rdark across this large biogeographical space. Variability between sites in the absolute rates of Rdark and the Rdark : photosynthesis ratio were driven by variations in N- and P-use efficiency, which were related to both taxonomic and environmental variability.
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Affiliation(s)
- Lucy Rowland
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3JNUK
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterAmory BuildingExeterEX4 4RJUK
| | - Joana Zaragoza‐Castells
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3JNUK
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterAmory BuildingExeterEX4 4RJUK
| | - Keith J. Bloomfield
- Division of Plant SciencesResearch School of BiologyAustralian National UniversityCanberra2601ACTAustralia
| | - Matthew H. Turnbull
- Centre for Integrative EcologySchool of Biological SciencesUniversity of CanterburyPrivate Bag4800ChristchurchNew Zealand
| | - Damien Bonal
- INRAUMR 1137 Ecologie et Ecophysiologie ForestieresChampenoux54280France
| | - Benoit Burban
- INRA UMR‐ECOFOGCampus agronomique ‐ BP 31697379KourouFrench GuianaFrance
| | - Norma Salinas
- Environmental Change InstituteSchool of Geography and the EnvironmentUniversity of OxfordSouth Parks RoadOxfordOX1 3QYUK
| | - Eric Cosio
- Pontificia Universidad Catolica del PeruSeccion QuimicaAv Universitaria 1801, San MiguelLimaPeru
| | - Daniel J. Metcalfe
- CSIROLand and WaterTropical Forest Research CentreAthertonQLD4883Australia
| | - Andrew Ford
- CSIROLand and WaterTropical Forest Research CentreAthertonQLD4883Australia
| | | | - Owen K. Atkin
- Division of Plant SciencesResearch School of BiologyAustralian National UniversityCanberra2601ACTAustralia
- ARC Centre of Excellence in Plant Energy BiologyDivision of Plant SciencesResearch School of BiologyAustralian National UniversityCanberra2601ACTAustralia
| | - Patrick Meir
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterAmory BuildingExeterEX4 4RJUK
- Division of Plant SciencesResearch School of BiologyAustralian National UniversityCanberra2601ACTAustralia
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Meir P, Shenkin A, Disney M, Rowland L, Malhi Y, Herold M, da Costa ACL. Plant Structure-Function Relationships and Woody Tissue Respiration: Upscaling to Forests from Laser-Derived Measurements. Advances in Photosynthesis and Respiration 2017. [DOI: 10.1007/978-3-319-68703-2_5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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Binks O, Meir P, Rowland L, da Costa ACL, Vasconcelos SS, de Oliveira AAR, Ferreira L, Mencuccini M. Limited acclimation in leaf anatomy to experimental drought in tropical rainforest trees. Tree Physiol 2016; 36:1550-1561. [PMID: 27614360 PMCID: PMC5165703 DOI: 10.1093/treephys/tpw078] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 07/12/2016] [Accepted: 07/16/2016] [Indexed: 05/10/2023]
Abstract
Dry periods are predicted to become more frequent and severe in the future in some parts of the tropics, including Amazonia, potentially causing reduced productivity, higher tree mortality and increased emissions of stored carbon. Using a long-term (12 year) through-fall exclusion (TFE) experiment in the tropics, we test the hypothesis that trees produce leaves adapted to cope with higher levels of water stress, by examining the following leaf characteristics: area, thickness, leaf mass per area, vein density, stomatal density, the thickness of palisade mesophyll, spongy mesophyll and both of the epidermal layers, internal cavity volume and the average cell sizes of the palisade and spongy mesophyll. We also test whether differences in leaf anatomy are consistent with observed differential drought-induced mortality responses among taxa, and look for relationships between leaf anatomy, and leaf water relations and gas exchange parameters. Our data show that trees do not produce leaves that are more xeromorphic in response to 12 years of soil moisture deficit. However, the drought treatment did result in increases in the thickness of the adaxial epidermis (TFE: 20.5 ± 1.5 µm, control: 16.7 ± 1.0 µm) and the internal cavity volume (TFE: 2.43 ± 0.50 mm3 cm-2, control: 1.77 ± 0.30 mm3 cm-2). No consistent differences were detected between drought-resistant and drought-sensitive taxa, although interactions occurred between drought-sensitivity status and drought treatment for the palisade mesophyll thickness (P = 0.034) and the cavity volume of the leaves (P = 0.025). The limited response to water deficit probably reflects a tight co-ordination between leaf morphology, water relations and photosynthetic properties. This suggests that there is little plasticity in these aspects of plant anatomy in these taxa, and that phenotypic plasticity in leaf traits may not facilitate the acclimation of Amazonian trees to the predicted future reductions in dry season water availability.
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Affiliation(s)
- Oliver Binks
- School of Geosciences, The Crew Building, The King's Buildings, University of Edinburgh, Edinburgh, EH9 3JN, UK
| | - Patrick Meir
- School of Geosciences, The Crew Building, The King's Buildings, University of Edinburgh, Edinburgh, EH9 3JN, UK
- Research School of Biology, Australian National University, Canberra, ACT 2601, Australia
| | - Lucy Rowland
- College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4QD, UK
| | | | | | | | | | - Maurizio Mencuccini
- School of Geosciences, The Crew Building, The King's Buildings, University of Edinburgh, Edinburgh, EH9 3JN, UK
- ICREA at CREAF , 08193 Cerdanyola del Vallés, Spain
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Binks O, Meir P, Rowland L, da Costa ACL, Vasconcelos SS, de Oliveira AAR, Ferreira L, Christoffersen B, Nardini A, Mencuccini M. Plasticity in leaf-level water relations of tropical rainforest trees in response to experimental drought. New Phytol 2016; 211:477-88. [PMID: 27001030 PMCID: PMC5071722 DOI: 10.1111/nph.13927] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 02/07/2016] [Indexed: 05/25/2023]
Abstract
The tropics are predicted to become warmer and drier, and understanding the sensitivity of tree species to drought is important for characterizing the risk to forests of climate change. This study makes use of a long-term drought experiment in the Amazon rainforest to evaluate the role of leaf-level water relations, leaf anatomy and their plasticity in response to drought in six tree genera. The variables (osmotic potential at full turgor, turgor loss point, capacitance, elastic modulus, relative water content and saturated water content) were compared between seasons and between plots (control and through-fall exclusion) enabling a comparison between short- and long-term plasticity in traits. Leaf anatomical traits were correlated with water relation parameters to determine whether water relations differed among tissues. The key findings were: osmotic adjustment occurred in response to the long-term drought treatment; species resistant to drought stress showed less osmotic adjustment than drought-sensitive species; and water relation traits were correlated with tissue properties, especially the thickness of the abaxial epidermis and the spongy mesophyll. These findings demonstrate that cell-level water relation traits can acclimate to long-term water stress, and highlight the limitations of extrapolating the results of short-term studies to temporal scales associated with climate change.
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Affiliation(s)
- Oliver Binks
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FEUK
| | - Patrick Meir
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FEUK
- Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - Lucy Rowland
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FEUK
| | | | | | | | | | | | - Andrea Nardini
- Dipartimento di Scienze della VitaUniversitá di TriesteVia L. Giorgieri 1034127TriesteItaly
| | - Maurizio Mencuccini
- School of GeoSciencesUniversity of EdinburghEdinburghEH9 3FEUK
- ICREA at CREAF08193Cerdanyola del VallésSpain
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Anderegg WRL, Martinez-Vilalta J, Cailleret M, Camarero JJ, Ewers BE, Galbraith D, Gessler A, Grote R, Huang CY, Levick SR, Powell TL, Rowland L, Sánchez-Salguero R, Trotsiuk V. When a Tree Dies in the Forest: Scaling Climate-Driven Tree Mortality to Ecosystem Water and Carbon Fluxes. Ecosystems 2016. [DOI: 10.1007/s10021-016-9982-1] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Sane RS, Ramsden D, Sabo JP, Cooper C, Rowland L, Ting N, Whitcher-Johnstone A, Tweedie DJ. Contribution of Major Metabolites toward Complex Drug-Drug Interactions of Deleobuvir: In Vitro Predictions and In Vivo Outcomes. Drug Metab Dispos 2015; 44:466-75. [DOI: 10.1124/dmd.115.066985] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 12/17/2015] [Indexed: 12/13/2022] Open
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Rowland L, Lobo‐do‐Vale RL, Christoffersen BO, Melém EA, Kruijt B, Vasconcelos SS, Domingues T, Binks OJ, Oliveira AAR, Metcalfe D, da Costa ACL, Mencuccini M, Meir P. After more than a decade of soil moisture deficit, tropical rainforest trees maintain photosynthetic capacity, despite increased leaf respiration. Glob Chang Biol 2015; 21:4662-72. [PMID: 26179437 PMCID: PMC4989466 DOI: 10.1111/gcb.13035] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 12/26/2014] [Accepted: 07/03/2015] [Indexed: 05/25/2023]
Abstract
Determining climate change feedbacks from tropical rainforests requires an understanding of how carbon gain through photosynthesis and loss through respiration will be altered. One of the key changes that tropical rainforests may experience under future climate change scenarios is reduced soil moisture availability. In this study we examine if and how both leaf photosynthesis and leaf dark respiration acclimate following more than 12 years of experimental soil moisture deficit, via a through-fall exclusion experiment (TFE) in an eastern Amazonian rainforest. We find that experimentally drought-stressed trees and taxa maintain the same maximum leaf photosynthetic capacity as trees in corresponding control forest, independent of their susceptibility to drought-induced mortality. We hypothesize that photosynthetic capacity is maintained across all treatments and taxa to take advantage of short-lived periods of high moisture availability, when stomatal conductance (gs ) and photosynthesis can increase rapidly, potentially compensating for reduced assimilate supply at other times. Average leaf dark respiration (Rd ) was elevated in the TFE-treated forest trees relative to the control by 28.2 ± 2.8% (mean ± one standard error). This mean Rd value was dominated by a 48.5 ± 3.6% increase in the Rd of drought-sensitive taxa, and likely reflects the need for additional metabolic support required for stress-related repair, and hydraulic or osmotic maintenance processes. Following soil moisture deficit that is maintained for several years, our data suggest that changes in respiration drive greater shifts in the canopy carbon balance, than changes in photosynthetic capacity.
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Affiliation(s)
- Lucy Rowland
- School of GeoSciencesUniversity of EdinburghEdinburghUK
| | | | - Bradley O. Christoffersen
- School of GeoSciencesUniversity of EdinburghEdinburghUK
- Earth and Environmental SciencesLos Alamos National LaboratoryLos AlamosCAUSA
| | | | - Bart Kruijt
- AlterraWageningen URWageningenthe Netherlands
| | | | - Tomas Domingues
- Departamento de BiologiaFFCLRP ‐ Universidade de São PauloRibeirão PretoBrasil
| | | | | | - Daniel Metcalfe
- Department of Physical Geography and Ecosystem ScienceLund UniversityLundSweden
| | | | - Maurizio Mencuccini
- School of GeoSciencesUniversity of EdinburghEdinburghUK
- ICREA at CREAF08193 Cerdanyola del VallésBarcelonaSpain
| | - Patrick Meir
- School of GeoSciencesUniversity of EdinburghEdinburghUK
- Research School of BiologyAustralian National UniversityCanberraAustralia
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Rowland L, da Costa ACL, Galbraith DR, Oliveira RS, Binks OJ, Oliveira AAR, Pullen AM, Doughty CE, Metcalfe DB, Vasconcelos SS, Ferreira LV, Malhi Y, Grace J, Mencuccini M, Meir P. Death from drought in tropical forests is triggered by hydraulics not carbon starvation. Nature 2015; 528:119-22. [DOI: 10.1038/nature15539] [Citation(s) in RCA: 370] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 09/02/2015] [Indexed: 11/09/2022]
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Meir P, Wood TE, Galbraith DR, Brando PM, Da Costa ACL, Rowland L, Ferreira LV. Threshold Responses to Soil Moisture Deficit by Trees and Soil in Tropical Rain Forests: Insights from Field Experiments. Bioscience 2015; 65:882-892. [PMID: 26955085 PMCID: PMC4777016 DOI: 10.1093/biosci/biv107] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Many tropical rain forest regions are at risk of increased future drought. The net effects of drought on forest ecosystem functioning will be substantial if important ecological thresholds are passed. However, understanding and predicting these effects is challenging using observational studies alone. Field-based rainfall exclusion (canopy throughfall exclusion; TFE) experiments can offer mechanistic insight into the response to extended or severe drought and can be used to help improve model-based simulations, which are currently inadequate. Only eight TFE experiments have been reported for tropical rain forests. We examine them, synthesizing key results and focusing on two processes that have shown threshold behavior in response to drought: (1) tree mortality and (2) the efflux of carbon dioxdie from soil, soil respiration. We show that: (a) where tested using large-scale field experiments, tropical rain forest tree mortality is resistant to long-term soil moisture deficit up to a threshold of 50% of the water that is extractable by vegetation from the soil, but high mortality occurs beyond this value, with evidence from one site of increased autotrophic respiration, and (b) soil respiration reaches its peak value in response to soil moisture at significantly higher soil moisture content for clay-rich soils than for clay-poor soils. This first synthesis of tropical TFE experiments offers the hypothesis that low soil moisture–related thresholds for key stress responses in soil and vegetation may prove to be widely applicable across tropical rain forests despite the diversity of these forests.
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Affiliation(s)
- Patrick Meir
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - Tana E Wood
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - David R Galbraith
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - Paulo M Brando
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - Antonio C L Da Costa
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - Lucy Rowland
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
| | - Leandro V Ferreira
- Patrick Meir is affiliated with the Research School of Biology at Australian National University, in Canberra, and with the School of Geosciences at the University of Edinburgh, in the United Kingdom. Tana E. Wood is affiliated with the US Department of Agriculture Forest Service's International Institute of Tropical Forestry, in Rio Piedras, Puerto Rico, and with the Fundación Puertorriqueña de Conservación, in San Juan, Puerto Rico. David R. Galbraith is affiliated with the School of Geography at the University of Leeds, in the United Kingdom. Paulo M. Brando is with the Instituto Pesquisa Ambiental Amazonia, in Belém, Brazil. Antonio C. L. da Costa is affiliated with the Universidade Federal de Para, in Belém, Brazil. Lucy Rowland is with the Research School of Biology at Australian National University, in Canberra. Leandro V. Ferreira is affiliated with the Museu Paraense Emílio Goeldi, in Belém, Brazil
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Rowland L, Hill TC, Stahl C, Siebicke L, Burban B, Zaragoza-Castells J, Ponton S, Bonal D, Meir P, Williams M. Evidence for strong seasonality in the carbon storage and carbon use efficiency of an Amazonian forest. Glob Chang Biol 2014; 20:979-91. [PMID: 23996917 PMCID: PMC4298765 DOI: 10.1111/gcb.12375] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 08/14/2013] [Indexed: 05/25/2023]
Abstract
The relative contribution of gross primary production and ecosystem respiration to seasonal changes in the net carbon flux of tropical forests remains poorly quantified by both modelling and field studies. We use data assimilation to combine nine ecological time series from an eastern Amazonian forest, with mass balance constraints from an ecosystem carbon cycle model. The resulting analysis quantifies, with uncertainty estimates, the seasonal changes in the net carbon flux of a tropical rainforest which experiences a pronounced dry season. We show that the carbon accumulation in this forest was four times greater in the dry season than in the wet season and that this was accompanied by a 5% increase in the carbon use efficiency. This seasonal response was caused by a dry season increase in gross primary productivity, in response to radiation and a similar magnitude decrease in heterotrophic respiration, in response to drying soils. The analysis also predicts increased carbon allocation to leaves and wood in the wet season, and greater allocation to fine roots in the dry season. This study demonstrates implementation of seasonal variations in parameters better enables models to simulate observed patterns in data. In particular, we highlight the necessity to simulate the seasonal patterns of heterotrophic respiration to accurately simulate the net carbon flux seasonal tropical forest.
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Affiliation(s)
- Lucy Rowland
- School of Geosciences, University of EdinburghEdinburgh, EH9 3JN, UK
| | | | | | | | | | | | - Stephane Ponton
- INRA, UMR 1137 Ecologie et Ecophysiologie ForestièresChampenoux, 54280, France
| | - Damien Bonal
- INRA, UMR 1137 Ecologie et Ecophysiologie ForestièresChampenoux, 54280, France
| | - Patrick Meir
- School of Geosciences, University of EdinburghEdinburgh, EH9 3JN, UK
- Research School of Biology, Division of Plant Sciences, Australian National UniversityCanberra, ACT, 0200, Australia
| | - Mathew Williams
- School of Geosciences, University of EdinburghEdinburgh, EH9 3JN, UK
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48
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Powell TL, Galbraith DR, Christoffersen BO, Harper A, Imbuzeiro HMA, Rowland L, Almeida S, Brando PM, da Costa ACL, Costa MH, Levine NM, Malhi Y, Saleska SR, Sotta E, Williams M, Meir P, Moorcroft PR. Confronting model predictions of carbon fluxes with measurements of Amazon forests subjected to experimental drought. New Phytol 2013; 200:350-365. [PMID: 23844931 DOI: 10.1111/nph.12390] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 05/20/2013] [Indexed: 05/08/2023]
Abstract
Considerable uncertainty surrounds the fate of Amazon rainforests in response to climate change. Here, carbon (C) flux predictions of five terrestrial biosphere models (Community Land Model version 3.5 (CLM3.5), Ecosystem Demography model version 2.1 (ED2), Integrated BIosphere Simulator version 2.6.4 (IBIS), Joint UK Land Environment Simulator version 2.1 (JULES) and Simple Biosphere model version 3 (SiB3)) and a hydrodynamic terrestrial ecosystem model (the Soil-Plant-Atmosphere (SPA) model) were evaluated against measurements from two large-scale Amazon drought experiments. Model predictions agreed with the observed C fluxes in the control plots of both experiments, but poorly replicated the responses to the drought treatments. Most notably, with the exception of ED2, the models predicted negligible reductions in aboveground biomass in response to the drought treatments, which was in contrast to an observed c. 20% reduction at both sites. For ED2, the timing of the decline in aboveground biomass was accurate, but the magnitude was too high for one site and too low for the other. Three key findings indicate critical areas for future research and model development. First, the models predicted declines in autotrophic respiration under prolonged drought in contrast to measured increases at one of the sites. Secondly, models lacking a phenological response to drought introduced bias in the sensitivity of canopy productivity and respiration to drought. Thirdly, the phenomenological water-stress functions used by the terrestrial biosphere models to represent the effects of soil moisture on stomatal conductance yielded unrealistic diurnal and seasonal responses to drought.
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Affiliation(s)
- Thomas L Powell
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA
| | - David R Galbraith
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, OX1 3QY, UK
| | | | - Anna Harper
- College of Engineering, Mathematics, and Physical Science, University of Exeter, Exeter, EX4 4QF, UK
- Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA
| | - Hewlley M A Imbuzeiro
- Grupo de Pesquisas em Interação Atmosfera-Biosfera, Universidade Federal de Viçosa, Viçosa, CEP 36570-000, Minas Gerias, Brazil
| | - Lucy Rowland
- School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
| | - Samuel Almeida
- Museu Paraense Emilio Goeldi, Belém, CEP 66077-530, Pará, Brazil
| | - Paulo M Brando
- Instituto de Pesquisa Ambiental da Amazônia, CEP 71503-505, Brasília, Distrito Federal, Brazil
| | | | - Marcos Heil Costa
- Grupo de Pesquisas em Interação Atmosfera-Biosfera, Universidade Federal de Viçosa, Viçosa, CEP 36570-000, Minas Gerias, Brazil
| | - Naomi M Levine
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA
| | - Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, OX1 3QY, UK
| | - Scott R Saleska
- Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, 85721, USA
| | | | - Mathew Williams
- School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
| | - Patrick Meir
- School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
| | - Paul R Moorcroft
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA
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49
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Rowland L, Malhi Y, Silva-Espejo JE, Farfán-Amézquita F, Halladay K, Doughty CE, Meir P, Phillips OL. The sensitivity of wood production to seasonal and interannual variations in climate in a lowland Amazonian rainforest. Oecologia 2013; 174:295-306. [PMID: 24026500 DOI: 10.1007/s00442-013-2766-9] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2013] [Accepted: 08/29/2013] [Indexed: 10/26/2022]
Abstract
Understanding climatic controls on tropical forest productivity is key to developing more reliable models for predicting how tropical biomes may respond to climate change. Currently there is no consensus on which factors control seasonal changes in tropical forest tree growth. This study reports the first comprehensive plot-level description of the seasonality of growth in a Peruvian tropical forest. We test whether seasonal and interannual variations in climate are correlated with changes in biomass increment, and whether such relationships differ among trees with different functional traits. We found that biomass increments, measured every 3 months on the two plots, were reduced by between 40 and 55% in the peak dry season (July-September) relative to peak wet season (January-March). The seasonal patterns of biomass accumulation are significantly (p < 0.01) associated with seasonal patterns of rainfall and soil water content; however, this may reflect a synchrony of seasonal cycles rather than direct physiological controls on tree growth rates. The strength of the growth seasonality response among trees is significantly correlated to functional traits: consistent with a hypothesised trade-off between maximum potential growth rate and hydraulic safety, tall and fast-growing trees with broad stems had the most strongly seasonal biomass accumulation, suggesting that they are more productive in the wet season, but more vulnerable to water limitation in the dry season.
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Affiliation(s)
- Lucy Rowland
- School of Geosciences, The University of Edinburgh, Edinburgh, UK,
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50
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Huang F, Allen L, Huang DB, Moy F, Vinisko R, Nguyen T, Rowland L, MacGregor TR, Castles MA, Robinson P. Evaluation of steady-state pharmacokinetic interactions between ritonavir-boosted BILR 355, a non-nucleoside reverse transcriptase inhibitor, and lamivudine/zidovudine in healthy subjects. J Clin Pharm Ther 2010; 37:81-8. [PMID: 21128991 DOI: 10.1111/j.1365-2710.2010.01235.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE BILR 355 is a second generation non-nucleoside reverse transcriptase inhibitor. It has shown promising in vitro anti-HIV-1 activities and favourable human pharmacokinetic properties after co-administration with ritonavir (RTV). Lamivudine (3TC) is a nucleoside reverse transcriptase inhibitor. It is excreted predominantly in urine by a transporter-mediated pathway. These two drugs are likely to be given together to HIV-infected patients. The objective of this study was to investigate any steady-state pharmacokinetic interactions between RTV-boosted BILR 355 and 3TC/zidovudine (ZDV). METHODS This was a randomized, open label, prospective study. In group A, 39 healthy subjects were given 3TC/ZDV (150 mg/300 mg) twice daily (b.i.d.) for 7 days, and then BILR 355 and RTV (BILR 355/r, 150 mg/100 mg) were co-administered with this regimen for an additional 7 days. Intensive blood samples were taken on days 7 and 14 for pharmacokinetic assessments. In group B, 12 healthy subjects were given BILR 355/r (150 mg/100 mg) b.i.d. for 7 days. The pharmacokinetic data from group B were pooled with data from group B subjects in other similar studies performed in parallel (BILR 355 alone group in BILR 355 drug-drug interaction studies with tipranavir, lopinavir/RTV, and emtricitabine/tenofovir DF; BILR 355 regimen was the same). RESULTS AND DISCUSSION After co-administration with BILR 355/r, the AUC(12,ss) and C(max,ss) of 3TC increased by 45% and 24%, respectively; the elimination half-life (t(1/2) ,ss) of 3TC was significantly increased. However, the pharmacokinetics of ZDV was unchanged. Co-administration with 3TC/ZDV resulted in a 22% decrease in AUC(12,ss) and a 20% decrease in C(max,ss) for BILR 355. The observed increase in exposure and prolongation of t(1/2,ss) of 3TC is potentially related to inhibition of OCT-mediated urinary excretion of 3TC. WHAT IS NEW AND CONCLUSION Concomitant administration of BILR 355 with 3TC/ZDV resulted in a modest decrease in exposure to BILR 355 and a 45% increase in exposure to 3TC.
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Affiliation(s)
- F Huang
- Boehringer Ingelheim Pharmaceuticals, Inc., Ridgefield, CT 06877-0368, USA.
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