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Grazing alters environmental control mechanisms of evapotranspiration in an alpine meadow of the Tibetan Plateau

文献类型：期刊论文

作者An, Tingting2; Xu, Mingjie2; Zhang, Tao2; Yu, Chengqun1; Li, Yingge2; Chen, Ning1; Zu, Jiaxing1; Li, Junxiang3; Zhu, Juntao1; Sun, Yi2
刊名JOURNAL OF PLANT ECOLOGY
出版日期2019-10-01
卷号12期号:5页码:834-845
关键词grazing evapotranspiration environmental factors alpine meadow path analysis
ISSN号1752-9921
DOI10.1093/jpe/rtz021
通讯作者Zhang, Tao(84395611@qq.com) ; Yu, Chengqun(yucq@igsnrr.ac.cn)
英文摘要Aims Evapotranspiration (ET) is an important component of the terrestrial water cycle and is easily affected by external disturbances, such as climate change and grazing. Identifying ET responses to grazing is instructive for determining grazing activity and informative for understanding the water cycle. Methods This study utilized 2 years (2014 and 2017) of eddy covariance data to test how grazing regulated ET for an alpine meadow ecosystem on the Tibetan Plateau (TP) by path analysis. Important Findings Radiation dominated ET with a decision coefficient of 64-74%. The soil water content (SWC) worked as the limiting factor in the fenced site. However, in the grazing site, the limiting factor was the vapor pressure deficit (VPD). Grazing had large effects on ET because it greatly affected the water conditions. The SWC and VPD were enhanced by 14.63% and 4.36% in the grazing site, respectively. Therefore, sufficient water was supplied to ET, especially during drought, and strengthened the transpiration pull. As a result, a favorable micrometeorological environment was created for ET. Grazing shifted the limiting factor of ET from the SWC to VPD, which weakened the limiting effect of the water conditions on ET and advanced the ET peak time. In addition, grazing altered the compositions of ET by changing the community structure, which directly resulted in an increased ET. In summary, grazing enhanced ET through altering the community structure and micrometeorological environments. The findings of this study further improve our understanding of the driving mechanisms of grazing on ET and will improve our predictions for the global water cycle.
WOS关键词GAP FILLING STRATEGIES ; SURFACE-ENERGY FLUXES ; WATER-USE EFFICIENCY ; CLIMATE-CHANGE ; INNER-MONGOLIA ; SOIL-WATER ; CARBON FLUXES ; LAND-SURFACE ; NAGQU-COUNTY ; ECOSYSTEM
资助项目National Natural Science Foundation of China[31600362] ; National Natural Science Foundation of China[31500360] ; National Natural Science Foundation of China[41725003] ; National Natural Science Foundation of China[41571195] ; China Postdoctoral Science Foundation[2018M631819] ; National Key Research and Development Project of China[2016YFC0502001] ; Science and Technology Project of State Grid Corporation of China[SGxzzzlwzhbGCJS1700095] ; National Key R&D Program of China[2017YFA0604801]
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000491991000005
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Key Research and Development Project of China ; Science and Technology Project of State Grid Corporation of China ; National Key R&D Program of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/129676]  
专题地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心
通讯作者Zhang, Tao; Yu, Chengqun
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Shenyang Agr Univ, Coll Agron, Shenyang 110866, Liaoning, Peoples R China
3.Peking Univ, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China
推荐引用方式
GB/T 7714		 An, Tingting,Xu, Mingjie,Zhang, Tao,et al. Grazing alters environmental control mechanisms of evapotranspiration in an alpine meadow of the Tibetan Plateau[J]. JOURNAL OF PLANT ECOLOGY,2019,12(5):834-845.
APA An, Tingting.,Xu, Mingjie.,Zhang, Tao.,Yu, Chengqun.,Li, Yingge.,...&Yu, Guirui.(2019).Grazing alters environmental control mechanisms of evapotranspiration in an alpine meadow of the Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,12(5),834-845.
MLA An, Tingting,et al."Grazing alters environmental control mechanisms of evapotranspiration in an alpine meadow of the Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 12.5(2019):834-845.

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来源：地理科学与资源研究所

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