globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13035
论文题名:
After more than a decade of soil moisture deficit, tropical rainforest trees maintain photosynthetic capacity, despite increased leaf respiration
作者: Rowland L.; Lobo-do-Vale R.L.; Christoffersen B.O.; Melém E.A.; Kruijt B.; Vasconcelos S.S.; Domingues T.; Binks O.J.; Oliveira A.A.R.; Metcalfe D.; da Costa A.C.L.; Mencuccini M.; Meir P.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期:12
起始页码: 4662
结束页码: 4672
语种: 英语
英文关键词: Drought ; Leaf dark respiration ; Photosynthetic capacity ; Through-fall exclusion ; Tropical rainforest
Scopus关键词: drought ; leaf ; photosynthesis ; rainforest ; respiration ; soil moisture ; stomatal conductance ; throughfall ; Amazonia ; soil ; Brazil ; carbon cycle ; chemistry ; climate change ; drought ; evapotranspiration ; photosynthesis ; physiology ; plant leaf ; rain forest ; season ; soil ; tree ; tropic climate ; Brazil ; Carbon Cycle ; Climate Change ; Droughts ; Photosynthesis ; Plant Leaves ; Plant Transpiration ; Rainforest ; Seasons ; Soil ; Trees ; Tropical Climate
英文摘要: 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. © 2015 John Wiley & Sons Ltd.
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被引频次[WOS]:61   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61862
Appears in Collections:影响、适应和脆弱性

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作者单位: School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; Forest Research Centre, School of Agriculture, University of Lisbon, Lisbon, Portugal; Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, CA, United States; EMBRAPA Amazônia Oriental, Belém, Brazil; Alterra, Wageningen UR, Wageningen, Netherlands; Departamento de Biologia, FFCLRP - Universidade de São Paulo, Ribeirão Preto, Brazil; Centro de Geosciências, Universidade Federal do Pará, Belém, Brazil; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; ICREA at CREAF, 08193 Cerdanyola del Vallés, Barcelona, Spain; Research School of Biology, Australian National University, Canberra, Australia

Recommended Citation:
Rowland L.,Lobo-do-Vale R.L.,Christoffersen B.O.,et al. After more than a decade of soil moisture deficit, tropical rainforest trees maintain photosynthetic capacity, despite increased leaf respiration[J]. Global Change Biology,2015-01-01,21(12)
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