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DOI	10.1002/hyp.14051
	Evaluation of actual evapotranspiration measured by large-scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai-Tibetan Plateau
	Dai, Licong; Fu, Ruiyu; Guo, Xiaowei; Ke, Xun; Du, Yangong; Zhang, Fawei; Li, Yikang; Qian, Dawen; Zhou, Huakun; Cao, Guangmin
通讯作者	Guo, XW (通讯作者)，Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining 810001, Peoples R China.
发表日期	2021
ISSN	0885-6087
EISSN	1099-1085
卷号	35 期号:4
英文摘要	The accurate estimation of evapotranspiration (ET) is essential for assessing water availability and requirements of regional-scale terrestrial ecosystems, and for understanding the hydrological cycle in alpine ecosystems. In this study, two large-scale weighing lysimeters were employed to estimate the magnitude and dynamics of actual evapotranspiration in a humid alpine Kobresia meadow from January 2018 to December 2019 on the northeastern Qinghai-Tibetan Plateau (QTP). The results showed that daily ETa averaged 2.24 +/- 0.10 mm day (-1) throughout the study period, with values of 3.89 +/- 0.14 and 0.81 +/- 0.06 mm day(-1) during the growing season and non-growing season, respectively. The cumulative ETa during the study period was 937.39 mm, exceeding precipitation (684.20 mm) received at the site during the same period by 37%, suggesting that almost all precipitation in the lysimeters was returned to the atmosphere by evapotranspiration. Furthermore, the cumulative ETa (805.04 mm) was almost equal to the maximum potential evapotranspiration estimated by the FAO-56 reference evapotranspiration (ET0) (801.94 mm) during the growing season, but the cumulative ETa (132.25 mm) was 113.72% less than the minimum equilibrium ETeq) (282.86 mm) during the non-growing season due to the limited surface moisture in frozen soil. The crop coefficient (K-c) also showed a distinct seasonal pattern, with a monthly average of 1.01 during the growing season. Structural equation model (SEM) and boosted regression tree (BRT) show that net radiation and air temperature were the most important factors affecting daily ETa during the whole study period and growing season, but that non-growing season ETa was dominated by soil water content and net radiation. The daily K-c was dominated by net radiation. Furthermore, both ETa and K-c were also affected by aboveground biomass.
关键词	EDDY COVARIANCE ECOSYSTEM ENERGY COMPONENTS DYNAMICS CHINA
英文关键词	alpine ecosystem; boosted regression trees; hydrological cycles; Qinghai‐ Tibetan Plateau; structural equation models
语种	英语
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS记录号	WOS:000645220700052
来源期刊	HYDROLOGICAL PROCESSES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254035
作者单位	[Dai, Licong; Guo, Xiaowei; Ke, Xun; Du, Yangong; Zhang, Fawei; Li, Yikang; Qian, Dawen; Zhou, Huakun; Cao, Guangmin] Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining 810001, Peoples R China; [Dai, Licong] Jiangxi Normal Univ, Coll Geog & Environm, Nanchang, Jiangxi, Peoples R China; [Fu, Ruiyu] Nanning Normal Univ, Sch Geog & Planning, Nanning, Peoples R China
推荐引用方式 GB/T 7714	Dai, Licong,Fu, Ruiyu,Guo, Xiaowei,et al. Evaluation of actual evapotranspiration measured by large-scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai-Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,35(4).
APA	Dai, Licong.,Fu, Ruiyu.,Guo, Xiaowei.,Ke, Xun.,Du, Yangong.,...&Cao, Guangmin.(2021).Evaluation of actual evapotranspiration measured by large-scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai-Tibetan Plateau.HYDROLOGICAL PROCESSES,35(4).
MLA	Dai, Licong,et al."Evaluation of actual evapotranspiration measured by large-scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai-Tibetan Plateau".HYDROLOGICAL PROCESSES 35.4(2021).