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Prolonged drought strongly suppresses temperate grasslands actual evapotranspiration: Insights from eddy covariance observations upscaling

文献类型：期刊论文

作者Ma, Lexin1; Chen, Zhi1,2,3; Lin, Quanhong1,2; Hao, Tianxiang1; Yang, Meng1; Zhu, Jianxing1,2; Yu, Linfei1; Sun, Mingyu4; Lin, Yong1,2; Li, Tao1,2
刊名AGRICULTURAL WATER MANAGEMENT
出版日期2026-04-01
卷号326页码:110211
关键词Precipitation Chinese Grassland Transect Net ecosystem productivity Monsoon system
ISSN号0378-3774
DOI10.1016/j.agwat.2026.110211
产权排序1
文献子类Article
英文摘要Despite frequent droughts in East Asian grasslands, most studies have concentrated on their impacts on carbon balance, leaving limited understanding of actual evapotranspiration (ETa) responses under prolonged drought conditions. The Chinese Grassland Transect (CGT), located in the transition zone between croplands and grasslands, spans alpine grasslands (AG) and temperate grasslands (TG) and provides a natural laboratory for examining drought impacts on water dynamics. In this study, monthly data from 18 eddy covariance sites were used to train and evaluate 24 machine learning models, and the best-performing model was applied to estimate ETa across AG and TG. Results showed a persistent increase in ETa in AG, whereas TG experienced significant declines during 1999-2011 due to prolonged drought associated with reduced precipitation (P). The variability of P in TG was largely controlled by the El Nino-Southern Oscillation (ENSO), whereas in AG, P was primarily influenced by the South Asian monsoon system and the region was less affected by drought impacts due to the Tibetan Plateau. Interannual variability in net ecosystem productivity (NEP) closely tracked the water balance, with NEP in TG more strongly influenced by water input (P), whereas NEP in AG was more strongly influenced by water loss (ETa). These findings reveal contrasting ETa responses to prolonged drought along the CGT and highlight the key roles of ENSO and monsoon systems in regional hydrology.
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WOS关键词TERRESTRIAL EVAPOTRANSPIRATION ; LAND EVAPORATION ; CHINA ; MOISTURE ; PRECIPITATION ; ECOSYSTEM ; VAPOR ; EXCHANGE ; PATTERN ; DATASET
WOS研究方向Agriculture ; Water Resources
语种英语
WOS记录号WOS:001689633500001
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/220952]  
专题生态系统网络观测与模拟院重点实验室_外文论文
通讯作者Chen, Zhi
作者单位1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China;
3.Univ Chinese Acad Sci, Beijing Yanshan Earth Crit Zone Natl Res Stn, Beijing 101408, Peoples R China;
4.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Lexin,Chen, Zhi,Lin, Quanhong,et al. Prolonged drought strongly suppresses temperate grasslands actual evapotranspiration: Insights from eddy covariance observations upscaling[J]. AGRICULTURAL WATER MANAGEMENT,2026,326:110211.
APA Ma, Lexin.,Chen, Zhi.,Lin, Quanhong.,Hao, Tianxiang.,Yang, Meng.,...&Yu, Guirui.(2026).Prolonged drought strongly suppresses temperate grasslands actual evapotranspiration: Insights from eddy covariance observations upscaling.AGRICULTURAL WATER MANAGEMENT,326,110211.
MLA Ma, Lexin,et al."Prolonged drought strongly suppresses temperate grasslands actual evapotranspiration: Insights from eddy covariance observations upscaling".AGRICULTURAL WATER MANAGEMENT 326(2026):110211.

入库方式： OAI收割

来源：地理科学与资源研究所

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