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Darenova E, Acosta M, Pokorny R, Pavelka M. Variability in temperature dependence of stem CO2 efflux from Norway spruce trees. Tree Physiol 2018; 38:1333-1344. [PMID: 29425384 DOI: 10.1093/treephys/tpy006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/10/2018] [Indexed: 06/08/2023]
Abstract
This study presents results from continuous measurements of stem CO2 efflux carried out for seven experimental seasons (from May to October) in a young Norway spruce forest. The objectives of the study were to determine variability in the response of stem CO2 efflux to stem temperature over the season and to observe differences in the calculated relationship between stem temperature and CO2 efflux based on full growing season data or on data divided into periods according to stem growth rate. Temperature sensitivity of stem CO2 efflux (Q10) calculated for the established periods ranged between 1.61 and 3.46 and varied over the season, with the lowest values occurring in July and August. Q10 calculated using data from the full growing seasons ranged between 2.30 and 2.94 and was often significantly higher than Q10 calculated for the individual periods. Temperature-normalized stem CO2 efflux (R10) determined using Q10 from growing season data was overestimated when the temperature was below 10 °C and underestimated when the temperature was above 10 °C, compared with R10 calculated using Q10 established for the individual periods. The differences in daily mean R10 calculated by these two approaches ranged between -0.9 and 0.2 μmol CO2 m-2 s-1. The results of this study confirm that long periods for determining the temperature dependence of stem CO2 efflux encompass different statuses of the wood (especially in relation to stem growth). This may cause bias in models using this relationship for estimating stem CO2 efflux as a function of temperature.
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Affiliation(s)
- Eva Darenova
- Global Change Research Institute CAS, v.v.i., Belidla 4a, Brno, Czech Republic
| | - Manuel Acosta
- Global Change Research Institute CAS, v.v.i., Belidla 4a, Brno, Czech Republic
| | - Radek Pokorny
- Mendel University in Brno, Zemedelská 3, Brno, Czech Republic
| | - Marian Pavelka
- Global Change Research Institute CAS, v.v.i., Belidla 4a, Brno, Czech Republic
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Han F, Wang X, Zhou H, Li Y, Hu D. Temporal dynamics and vertical variations in stem CO 2 efflux of Styphnolobium japonicum. J Plant Res 2017; 130:845-858. [PMID: 28536983 DOI: 10.1007/s10265-017-0951-3] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 04/14/2017] [Indexed: 06/07/2023]
Abstract
CO2 efflux (ECO2) from stems and branches is highly variable within trees. To investigate the mechanisms underlying the temporal dynamics and vertical variations in ECO2, we measured the stem ECO2 by infrared gas analysis (IRGA) and meteorological conditions at 10 different heights from 0.1 to 3.7 m aboveground on two consecutive days every month for 1 year in six Styphnolobium japonicum trees with a similar size. The results indicated that the seasonal change in ECO2 roughly followed the seasonal variations in woody tissue temperature (TW) and stem radial diameter increment (Di). Together, TW and Di explained the monthly change in ECO2, and the contributions of TW and Di changed with the stem positions and growth stages. The diurnal patterns of ECO2 differed greatly between the growing and dormant season, showing a bimodal distribution with an obvious midday depression in the former and a unimodal distribution in the latter. The strong vertical variation in the day-time ECO2 of the growing season was mainly caused by the vertical gradients of TW, Di and difference in sapwood volume per unit of the stem surface along the trunk. The temperature-sensitivity coefficient (Q10) was not constant, as assumed in some models, but was instead vertically altered and highly dependent on the measurement temperature. For all stem positions, the highest Q10 value appeared at approximately 5 °C, and both higher and lower temperatures decreased Q10. Our study demonstrated that application of a constant Q10 would cause an estimation error when scaling up chamber-based measurements to annual carbon budgets at the whole-stem level.
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Affiliation(s)
- Fengsen Han
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049, Republic of China
| | - Xiaolin Wang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, Republic of China
| | - Hongxuan Zhou
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, Republic of China
| | - Yuanzheng Li
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, Republic of China
- University of Chinese Academy of Sciences, Beijing, 100049, Republic of China
| | - Dan Hu
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, Republic of China.
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Inoue A, Sakamoto M. Comparing the methods for quantifying the culm surface area of bamboo, Phyllostachys pubescens. Ecol Res 2017. [DOI: 10.1007/s11284-017-1453-4] [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: 10/19/2022]
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Wagner F, Rossi V, Aubry-Kientz M, Bonal D, Dalitz H, Gliniars R, Stahl C, Trabucco A, Hérault B. Pan-tropical analysis of climate effects on seasonal tree growth. PLoS One 2014; 9:e92337. [PMID: 24670981 PMCID: PMC3966775 DOI: 10.1371/journal.pone.0092337] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [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: 11/01/2013] [Accepted: 02/21/2014] [Indexed: 12/04/2022] Open
Abstract
Climate models predict a range of changes in tropical forest regions, including increased average temperatures, decreased total precipitation, reduced soil moisture and alterations in seasonal climate variations. These changes are directly related to the increase in anthropogenic greenhouse gas concentrations, primarily CO2. Assessing seasonal forest growth responses to climate is of utmost importance because woody tissues, produced by photosynthesis from atmospheric CO2, water and light, constitute the main component of carbon sequestration in the forest ecosystem. In this paper, we combine intra-annual tree growth measurements from published tree growth data and the corresponding monthly climate data for 25 pan-tropical forest sites. This meta-analysis is designed to find the shared climate drivers of tree growth and their relative importance across pan-tropical forests in order to improve carbon uptake models in a global change context. Tree growth reveals significant intra-annual seasonality at seasonally dry sites or in wet tropical forests. Of the overall variation in tree growth, 28.7% was explained by the site effect, i.e. the tree growth average per site. The best predictive model included four climate variables: precipitation, solar radiation (estimated with extrasolar radiation reaching the atmosphere), temperature amplitude and relative soil water content. This model explained more than 50% of the tree growth variations across tropical forests. Precipitation and solar radiation are the main seasonal drivers of tree growth, causing 19.8% and 16.3% of the tree growth variations. Both have a significant positive association with tree growth. These findings suggest that forest productivity due to tropical tree growth will be reduced in the future if climate extremes, such as droughts, become more frequent.
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Affiliation(s)
- Fabien Wagner
- Remote Sensing Division, National Institute for Space Research - INPE, São José dos Campos, SP, Brazil
- Cirad, UMR 93 “Ecologie des Forêts de Guyane,” Kourou, France
| | - Vivien Rossi
- Cirad, UR 105 “Biens et services des écosystèmes forestiers tropicaux,” Montpellier, France
- Université de Yaoundé 1, UMI 209 “Modélisation Mathématique et Informatique de Systèmes Complexes,” Yaoundé, Cameroun
| | - Mélaine Aubry-Kientz
- Université des Antilles et de la Guyane, UMR 93 “Ecologie des Forêts de Guyane,” Kourou, France
| | | | - Helmut Dalitz
- Institute of Botany, University of Hohenheim, Stuttgart, Germany
| | - Robert Gliniars
- Institute of Botany, University of Hohenheim, Stuttgart, Germany
| | - Clément Stahl
- Cirad, UMR 93 “Ecologie des Forêts de Guyane,” Kourou, France
- CIRAD, UMR “Systèmes d'Elevage en Milieux Méditerranéens et Tropicaux,” Kourou, France
| | - Antonio Trabucco
- Euro-Mediterranean Centre for Climate Change, Sassari, Italy
- Division of Forest, Nature, and Landscape, KU Leuven, Leuven, Belgium
| | - Bruno Hérault
- Cirad, UMR 93 “Ecologie des Forêts de Guyane,” Kourou, France
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Zach A, Horna V, Leuschner C, Zimmermann R. Patterns of wood carbon dioxide efflux across a 2,000-m elevation transect in an Andean moist forest. Oecologia 2009; 162:127-37. [PMID: 19707793 PMCID: PMC2776160 DOI: 10.1007/s00442-009-1438-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [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: 03/09/2008] [Accepted: 08/03/2009] [Indexed: 11/24/2022]
Abstract
During a 1-year measurement period, we recorded the CO2 efflux from stems (RS) and coarse woody roots (RR) of 13–20 common tree species at three study sites at 1,050, 1,890 and 3,050 m a.s.l. in an Andean moist forest. The objective of this work was to study elevation changes of woody tissue CO2 efflux and the relationship to climate variation, site characteristics and growth. Furthermore, we aim to provide insights into important respiration–productivity relationships of a little studied tropical vegetation type. We expected RS and RR to vary with dry and humid season conditions. We further expected RS to vary more than RR due to a more stable soil than air temperature regime. Seasonal variation in woody tissue CO2 efflux was indeed mainly attributable to stems. At the same time, temperature played only a small role in triggering variations in RS. At stand level, the ratio of C release (g C m−2 ground area year−1) between stems and roots varied from 4:1 at 1,050 m to 1:1 at 3,050 m, indicating the increasing prevalence of root activity at high elevations. The fraction of growth respiration from total respiration varied between 10 (3,050 m) and 14% (1,050 m) for stems and between 5 (1,050 m) and 30% (3,050 m) for roots. Our results show that respiratory activity and hence productivity is not driven by low temperatures towards higher elevations in this tropical montane forest. We suggest that future studies should examine the limitation of carbohydrate supply from leaves as a driver for the changes in respiratory activity with elevation.
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Affiliation(s)
- Alexandra Zach
- Plant Ecology, Albrecht von Haller Institute for Plant Sciences, University of Göttingen, Gottingen, Germany.
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