globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13509
论文题名:
Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales
作者: Wu J.; Guan K.; Hayek M.; Restrepo-Coupe N.; Wiedemann K.T.; Xu X.; Wehr R.; Christoffersen B.O.; Miao G.; da Silva R.; de Araujo A.C.; Oliviera R.C.; Camargo P.B.; Monson R.K.; Huete A.R.; Saleska S.R.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期:3
起始页码: 1240
结束页码: 1257
语种: 英语
英文关键词: environmental limitation ; leaf demography ; leaf quality ; leaf quantity ; light-use efficiency ; phenology ; physiology ; temperature sensitivity on productivity
英文摘要: Gross ecosystem productivity (GEP) in tropical forests varies both with the environment and with biotic changes in photosynthetic infrastructure, but our understanding of the relative effects of these factors across timescales is limited. Here, we used a statistical model to partition the variability of seven years of eddy covariance-derived GEP in a central Amazon evergreen forest into two main causes: variation in environmental drivers (solar radiation, diffuse light fraction, and vapor pressure deficit) that interact with model parameters that govern photosynthesis and biotic variation in canopy photosynthetic light-use efficiency associated with changes in the parameters themselves. Our fitted model was able to explain most of the variability in GEP at hourly (R2= 0.77) to interannual (R2= 0.80) timescales. At hourly timescales, we found that 75% of observed GEP variability could be attributed to environmental variability. When aggregating GEP to the longer timescales (daily, monthly, and yearly), however, environmental variation explained progressively less GEP variability: At monthly timescales, it explained only 3%, much less than biotic variation in canopy photosynthetic light-use efficiency, which accounted for 63%. These results challenge modeling approaches that assume GEP is primarily controlled by the environment at both short and long timescales. Our approach distinguishing biotic from environmental variability can help to resolve debates about environmental limitations to tropical forest photosynthesis. For example, we found that biotically regulated canopy photosynthetic light-use efficiency (associated with leaf phenology) increased with sunlight during dry seasons (consistent with light but not water limitation of canopy development) but that realized GEP was nonetheless lower relative to its potential efficiency during dry than wet seasons (consistent with water limitation of photosynthesis in given assemblages of leaves). This work highlights the importance of accounting for differential regulation of GEP at different timescales and of identifying the underlying feedbacks and adaptive mechanisms. © 2016 John Wiley & Sons Ltd
资助项目: Wu, J. ; Environmental & Climate Sciences Department, Brookhaven National Lab, UptonUnited States ; 电子邮件: jinwu@bnl.gov
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61043
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Department of Natural Resources and Environmental Sciences, University of Illinois at Urbana Champaign, Urbana, IL, United States; National Center for Supercomputing Applications, University of Illinois at Urbana Champaign, Urbana, IL, United States; John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Plant Functional Biology and Climate Change Cluster, University of Technology Sydney, Sydney, NSW, Australia; Department of Geosciences, Princeton University, Princeton, NJ, United States; Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Forestry and Environmental Resources, North Carolina State University at Raleigh, Raleigh, NC, United States; Department of Environmental Physics, University of Western Para-UFOPA, Para, Brazil; Embrapa Amazonia Oriental, Belem, Brazil; Embrapa Amazônia Oriental, Santarém, Brazil; Laboratorio de Ecologia Isotopica, Centro de Energia Nuclear na Agricultura (CENA), Universidade de Sao Paulo, Piracicaba, SP, Brazil; Department of Ecology and Evolutionary Biology and Laboratory of Tree Ring Research, University of Arizona, Tucson, AZ, United States; Environmental & Climate Sciences Department, Brookhaven National Lab, Upton, New York, NY, United States

Recommended Citation:
Wu J.,Guan K.,Hayek M.,et al. Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales[J]. Global Change Biology,2017-01-01,23(3)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Wu J.]'s Articles
[Guan K.]'s Articles
[Hayek M.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Wu J.]'s Articles
[Guan K.]'s Articles
[Hayek M.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Wu J.]‘s Articles
[Guan K.]‘s Articles
[Hayek M.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.