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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. THE NEW PHYTOLOGIST 2023; 240:1405-1420. [PMID: 37705460 DOI: 10.1111/nph.19257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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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Hiiragi K, Matsuo N, Sakai S, Kawahara K, Ichie T, Kenzo T, Aurelia DC, Kume T, Nakagawa M. Water uptake patterns of tropical canopy trees in Borneo: species-specific and temporal variation and relationships with aboveground traits. TREE PHYSIOLOGY 2022; 42:1928-1942. [PMID: 35656927 DOI: 10.1093/treephys/tpac061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 05/13/2022] [Indexed: 06/15/2023]
Abstract
Root water uptake depth and its temporal variation are important determinants of tree mortality, resource partitioning and drought resistance; however, their effects on tropical trees remain poorly understood. In this study, we investigated interspecific differences in water uptake depth and its temporal variation using stable isotope analysis and examined the relationships between water uptake depth and aboveground traits in a humid aseasonal tropical rainforest in Borneo. Species-specific differences in water uptake depth were examined for six dominant dipterocarp species. Temporal variation in water uptake depth for various canopy trees was assessed in three periods with different soil moisture conditions. We then examined the relationships between water uptake depth and aboveground traits including wood density, maximum tree height, flowering frequency and growth rate. Dipterocarpus globosus appeared to be more reliant on deep water resources than the other dipterocarp species. Water uptake from the soil layers varied among the three sampling periods. Trees generally utilized deeper soil water during the second driest sampling period, when temperatures were lowest. During the driest and wettest sampling periods, species with higher flowering frequencies tended to preferentially uptake deep soil water. These results suggest that low temperature and soil moisture promote increased deep soil water uptake in the study region. Dynamic relationships between water uptake patterns and aboveground tree traits may be related to resource partitioning among co-existing species.
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Affiliation(s)
- Katsuura Hiiragi
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Naoko Matsuo
- Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan
| | - Shoko Sakai
- Center for Ecological Research, Kyoto University, Otsu 520-2113, Japan
| | - Kazuma Kawahara
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Tomoaki Ichie
- Faculty of Agriculture and Marine Science, Kochi University, 783-8502, Japan
| | - Tanaka Kenzo
- Japan International Research Center for Agricultural Sciences, Tsukuba 305-8686, Japan
| | - Dulce Chung Aurelia
- Research, Development and Innovation Division, Forest Department Sarawak, 93250 Kuching, Sarawak, Malaysia
| | - Tomonori Kume
- Kasuya Research Forest, Kyusyu University, Sasaguri, Kasuya, Fukuoka 811-2415, Japan
| | - Michiko Nakagawa
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Ichie T, Igarashi S, Yoshihara R, Takayama K, Kenzo T, Niiyama K, Nur Hajar ZS, Hyodo F, Tayasu I. Verification of the accuracy of the recent 50 years of tree growth and long‐term change in intrinsic water‐use efficiency using xylem Δ
14
C and δ
13
C in trees in an aseasonal tropical rainforest. Methods Ecol Evol 2022. [DOI: 10.1111/2041-210x.13823] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomoaki Ichie
- Faculty of Agriculture and Marine Science Kochi University Nankoku Japan
| | - Shuichi Igarashi
- Faculty of Agriculture and Marine Science Kochi University Nankoku Japan
| | - Ryo Yoshihara
- Graduate School of Integrated Arts and Sciences Kochi University Nankoku Japan
| | - Kanae Takayama
- Faculty of Agriculture and Marine Science Kochi University Nankoku Japan
| | - Tanaka Kenzo
- Japan International Research Center for Agricultural Sciences Tsukuba Japan
| | - Kaoru Niiyama
- Forestry and Forest Products Research Institute Tsukuba Japan
| | | | - Fujio Hyodo
- Research Core for Interdisciplinary Sciences Okayama University Okayama Japan
| | - Ichiro Tayasu
- Research Institute for Humanity and Nature Kyoto Japan
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