Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations

doi:10.1016/j.agrformet.2021.108385

	Discrepant responses between evapotranspiration- and transpiration-based ecosystem water use efficiency to interannual precipitation fluctuations
	Gu, Chunjie 3; Tang, Qiuhong 3,4; Zhu, Gaofeng 5; Ma, Jinzhu 5; Gu, Chunli 6; Zhang, Kun 7; Sun, Shuang 8; Yu, Qiang 1; Niu, Shuli 2,4
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-06-15
卷号	303 页码:10
关键词	Ecosystem water use efficiency Eddy covariance PT-JPL model PM model Precipitation fluctuations Evapotranspiration partition Water availability
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2021.108385
通讯作者	Tang, Qiuhong(tangqh@igsnrr.ac.cn)
英文摘要	Climate 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.
资助项目	National 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
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000639140200018
资助机构	National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; CDIAC ; ICOS Ecosystem Thematic Center ; OzFlux office ; ChinaFlux office ; AsiaFlux office
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161792]
专题	中国科学院地理科学与资源研究所
通讯作者	Tang, Qiuhong
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100094, Peoples R China 5.Lanzhou Univ, Coll Earth & Environm Sci, Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou, Peoples R China 6.Beijing Inst Appl Meteorol, Beijing 100029, Peoples R China 7.Chinese Acad Sci, Natl Tibetan Plateau Data Ctr, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China 8.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
推荐引用方式 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.