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Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations
Gu, Chunjie1; Tang, Qiuhong1,2; Zhu, Gaofeng3; Ma, Jinzhu3; Gu, Chunli4; Zhang, Kun5; Sun, Shuang6; Yu, Qiang7; Niu, Shuli2,8
2021-06-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume303Pages:10
Corresponding AuthorTang, Qiuhong(tangqh@igsnrr.ac.cn)
AbstractClimate change intensifies precipitation fluctuation and increases drought frequency around the globe. Water use efficiency (WUE) has proven to be a crucial metric to quantify the trade-off linking global carbon and water cycles in many aspects of terrestrial ecosystem function. Investigating the response of ecosystem WUE to multiannual precipitation fluctuations has major implications for our understanding of ecosystem carbon and water dynamics. However, the impacts of water availability variation on evapotranspiration- and transpiration-based ecosystem WUE and their mechanisms are poorly understood due to limited observations. We investigated ecosystem WUE in response to interannual precipitation fluctuations in order to reveal the regularity underlying WUE changes under different levels of water stress. We optimized the parameters of two remote sensing models (PT-JPL and PM) based on different biophysical processes using the differential-evolution Markov Chain (DE-MC) method. We investigated ecosystem WUEET (GPP/ET) and WUET (GPP/T) in response to interannual precipitation fluctuations at 73 sites. We found ecosystem WUET appears to decline during drought years and to increase in wet years contrasting with WUEET, which was mostly attributable to differing sensitivities of GPP, ET and T to multiannual precipitation fluctuations. The vegetation generally consumes more T to improve ecosystem GPP during dry years, meanwhile, no apparent change in WUEET during dry years because of the trade of between GPP/T and T/ET. The replenishment of soil moisture to ecosystem transpiration is higher than we thought during dry years. This was masked in analysis that considered the responses of GPP and T to annual precipitation changes separately, but was revealed by the changes in ecosystem WUET. This research advances our understanding of the consequences of water fluctuation on ecosystem carbon and water exchange.
KeywordEcosystem water use efficiency Eddy covariance PT-JPL model PM model Precipitation fluctuations Evapotranspiration partition Water availability
DOI10.1016/j.agrformet.2021.108385
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41790424] ; National Natural Science Foundation of China[41730645] ; International Partnership Program of Chinese Academy of Sciences[131A11KYSB20180034] ; International Partnership Program of Chinese Academy of Sciences[131A11KYSB20170113] ; CDIAC ; ICOS Ecosystem Thematic Center ; OzFlux office ; ChinaFlux office ; AsiaFlux office
Funding OrganizationNational Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; CDIAC ; ICOS Ecosystem Thematic Center ; OzFlux office ; ChinaFlux office ; AsiaFlux office
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000639140200018
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/161793
Collection中国科学院地理科学与资源研究所
Corresponding AuthorTang, Qiuhong
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100094, Peoples R China
3.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou, Peoples R China
4.Beijing Inst Appl Meteorol, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
6.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
7.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
8.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Gu, Chunjie,Tang, Qiuhong,Zhu, Gaofeng,et al. Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,303:10.
APA Gu, Chunjie.,Tang, Qiuhong.,Zhu, Gaofeng.,Ma, Jinzhu.,Gu, Chunli.,...&Niu, Shuli.(2021).Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations.AGRICULTURAL AND FOREST METEOROLOGY,303,10.
MLA Gu, Chunjie,et al."Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations".AGRICULTURAL AND FOREST METEOROLOGY 303(2021):10.
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