DOI: 10.1111/gcb.14293
Scopus记录号: 2-s2.0-85047784815
论文题名: Causes of reduced leaf-level photosynthesis during strong El Niño drought in a Central Amazon forest
作者: Santos V.A.H.F.D. ; Ferreira M.J. ; Rodrigues J.V.F.C. ; Garcia M.N. ; Ceron J.V.B. ; Nelson B.W. ; Saleska S.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 9 起始页码: 4266
结束页码: 4279
语种: 英语
英文关键词: chlorophyll fluorescence
; climate change
; drought stress
; stomatal conductance
; tropical forest
; warming
英文摘要: Sustained drought and concomitant high temperature may reduce photosynthesis and cause tree mortality. Possible causes of reduced photosynthesis include stomatal closure and biochemical inhibition, but their relative roles are unknown in Amazon trees during strong drought events. We assessed the effects of the recent (2015) strong El Niño drought on leaf-level photosynthesis of Central Amazon trees via these two mechanisms. Through four seasons of 2015, we measured leaf gas exchange, chlorophyll a fluorescence parameters, chlorophyll concentration, and nutrient content in leaves of 57 upper canopy and understory trees of a lowland terra firme forest on well-drained infertile oxisol. Photosynthesis decreased 28% in the upper canopy and 17% in understory trees during the extreme dry season of 2015, relative to other 2015 seasons and was also lower than the climatically normal dry season of the following non-El Niño year. Photosynthesis reduction under extreme drought and high temperature in the 2015 dry season was related only to stomatal closure in both upper canopy and understory trees, and not to chlorophyll a fluorescence parameters, chlorophyll, or leaf nutrient concentration. The distinction is important because stomatal closure is a transient regulatory response that can reverse when water becomes available, whereas the other responses reflect more permanent changes or damage to the photosynthetic apparatus. Photosynthesis decrease due to stomatal closure during the 2015 extreme dry season was followed 2 months later by an increase in photosynthesis as rains returned, indicating a margin of resilience to one-off extreme climatic events in Amazonian forests. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110259
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Environmental Dynamics Department, Brazil′s National Institute for Amazon Research, Manaus, Brazil; Department of Forest Sciences, Federal University of Amazonas, Manaus, Brazil; Center for Distance Education, Federal University of Amazonas, Manaus, Brazil; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Santos V.A.H.F.D.,Ferreira M.J.,Rodrigues J.V.F.C.,et al. Causes of reduced leaf-level photosynthesis during strong El Niño drought in a Central Amazon forest[J]. Global Change Biology,2018-01-01,24(9)