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DOI: 10.1002/2016GL068501
Title:
Canopy and physiological controls of GPP during drought and heat wave
Author: Zhang Y.; Xiao X.; Zhou S.; Ciais P.; McCarthy H.; Luo Y.
Source Publication: Geophysical Research Letters
ISSN: 0094-9124
EISSN: 1944-8855
Publishing Year: 2016
Volume: 43, Issue:7
pages begin: 3325
pages end: 3333
Language: 英语
Keyword: anomaly ; land surface temperature ; production efficiency models ; vapor pressure deficit ; vegetation indices
Scopus Keyword: Atmospheric temperature ; Climatology ; Drought ; Ecology ; Ecosystems ; Efficiency ; Forestry ; Physiology ; Reflection ; Reflectometers ; Vegetation ; Anomaly ; Land surface temperature ; Production efficiency ; Vapor pressure deficit ; Vegetation index ; Physiological models
English Abstract: Vegetation indices (VIs) derived from satellite reflectance measurements are often used as proxies of canopy activity to evaluate the impacts of drought and heat wave on gross primary production (GPP) through production efficiency models. However, GPP is also regulated by physiological processes that cannot be directly detected using reflectance measurements. This study analyzes the co-limitation of canopy and plant physiology (represented by VIs and climate anomalies, respectively) on GPP during the 2003 European summer drought and heat wave for 15 Euroflux sites. During the entire drought period, spatial pattern of GPP anomalies can be quantified by relative changes in VIs. We also find that GPP sensitivity to relative canopy changes is higher for nonforest ecosystems (1.81 ± 0.32%GPP/%enhanced vegetation index), while GPP sensitivity to physiological changes is higher for forest ecosystems (-0.18 ± 0.05 g C m-2 d-1/hPa). A conceptual model is further built to better illustrate the canopy and physiological controls on GPP during drought periods. © 2016. American Geophysical Union. All Rights Reserved.
Related Link: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981762356&doi=10.1002%2f2016GL068501&partnerID=40&md5=5c30c68f36f5075d898a8ac01bce923c
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Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/10087
Appears in Collections:科学计划与规划
气候变化与战略

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Affiliation: Department of Microbiology and Plant Biology, Center for Spatial Analysis, University of Oklahoma, Norman, OK, United States

Recommended Citation:
Zhang Y.,Xiao X.,Zhou S.,et al. Canopy and physiological controls of GPP during drought and heat wave[J]. Geophysical Research Letters,2016-01-01,43(7).
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