干旱区生态环境知识资源中心(Arid): Dynamics and environmental controls of evapotranspiration for typical alpine meadow in the northeastern Tibetan Plateau

Arid

DOI	10.1016/j.jhydrol.2022.128282
	Dynamics and environmental controls of evapotranspiration for typical alpine meadow in the northeastern Tibetan Plateau
	Chang, Yaping; Ding, Yongjian; Zhang, Shiqiang; Qin, Jia; Zhao, Qiudong
通讯作者	Ding, YJ ; Zhao, QD
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2022
卷号	612
英文摘要	To understand the water, energy, and carbon cycles in the Tibetan Plateau (TP), it is essential to estimate seasonal and inter-annual variations in energy fluxes and evapotranspiration (ET) for alpine meadow ecosystems. The multiyear (2014-2019) energy fluxes and ET, for a typical alpine meadow at Arou station (northeastern TP), and their environmental and biophysical controls were evaluated using the eddy covariance method in this study. Latent heat flux (LE) was the dominant component of energy consumption during the growing season, whereas sensible heat flux (H) dominated energy partitioning during the non-growing season. H showed the opposite trend to LE, while the seasonal variation of soil heat flux (G) was small. The daily ET was primarily controlled by the available energy on the seasonal scale. Soil water content (SWC) and normalized difference vegetation index (NDVI) displayed secondary effects on ET during the non-growing and growing seasons, respectively. The inter-annual ET was relatively stable, ranging from 562.6 to 661.9 mm (coefficient of variation; CV = 7.4 %); this was slightly higher than the annual precipitation despite large variations in inter-annual precipitation (CV = 19.9 %) and was most likely due to snow and frozen ground melting. The cumulative ET in the growing season was about 77 % of the annual ET. There was a nonlinear increase in the daily Priestley-Taylor coefficient (alpha = ET/ETeq, where ETeq is the equilibrium evaporation) with an increase in bulk surface conductance (g(c)), which was insensitive to increases in g(c) that exceeded 15 mm s(-1). There was a good relationship between gc and NDVI. This study provides insights into the driving mechanisms of long-term variations in the energy partitioning and biophysical controls on ET in alpine meadow ecosystems.
英文关键词	Energy flux Evapotranspiration Bulk surface conductance Decoupling factor Alpine meadow Tibetan Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000844387300001
WOS关键词	SURFACE-ENERGY BUDGET ; HEIHE RIVER-BASIN ; EDDY-COVARIANCE ; CARBON-DIOXIDE ; ARID REGION ; EXCHANGE ; WATER ; FLUX ; ECOSYSTEMS ; GRASSLAND
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393502
推荐引用方式 GB/T 7714	Chang, Yaping,Ding, Yongjian,Zhang, Shiqiang,et al. Dynamics and environmental controls of evapotranspiration for typical alpine meadow in the northeastern Tibetan Plateau[J],2022,612.
APA	Chang, Yaping,Ding, Yongjian,Zhang, Shiqiang,Qin, Jia,&Zhao, Qiudong.(2022).Dynamics and environmental controls of evapotranspiration for typical alpine meadow in the northeastern Tibetan Plateau.JOURNAL OF HYDROLOGY,612.
MLA	Chang, Yaping,et al."Dynamics and environmental controls of evapotranspiration for typical alpine meadow in the northeastern Tibetan Plateau".JOURNAL OF HYDROLOGY 612(2022).