气候变化领域集成服务门户(CCPortal): Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau

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DOI	10.1016/j.jhydrol.2015.12.021
	Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau
	Coners, Heinz; Babel, Wolfgang; Willinghoefer, Sandra; Biermann, Tobias; Koehler, Lars; Seeber, Elke; Foken, Thomas; Ma, Yaoming; Yang, Yongping; Miehe, Georg; Leuschner, Christoph
通讯作者	Leuschner, C (通讯作者)
发表日期	2016
ISSN	0022-1694
EISSN	1879-2707
起始页码	557
结束页码	566
卷号	533
英文摘要	High-elevation grasslands of the Cyperaceae Kobresia pygmaea cover nearly half a million km(2) on the Tibetan Plateau. As a consequence of climate change, precipitation patterns in this monsoon influenced region may change with possible consequences for grassland productivity. Yet, not much is known about the water cycle in this second largest alpine ecosystem of the world. We measured the evapotranspiration of a high-elevation Kobresia pasture system at 4400 m a.s.l. in the south-eastern part of the plateau in two summers using three different approaches, weighable micro-lysimeters, eddy covariance measurements, and water balance modeling with the soil-plant-atmosphere transfer model SEWAB. In good agreement among the three approaches, we found ET rates of 4-6 mm d(-1) in moist summer periods (June-August) and similar to 2 mm d(-1) in dry periods, despite the high elevation and a leaf area index of only similar to 1. Measured ET rates were comparable to rates reported from alpine grasslands at 1500-2500 m a.s.l. in temperate mountains, and also matched ET rates of managed lowland grasslands in the temperate zone. At the study site with 430 mm annual precipitation, low summer rainfall reduced ET significantly and infiltration into the subsoil occurred only in moist periods. Our results show that the evapotranspiration of high-elevation grasslands at 4400 m can be as high as in lowland grasslands despite large elevational changes in abiotic and biotic drivers of ET, and periodic water shortage is likely to influence large parts of the Tibetan Kobresia pastures. (C) 2015 Elsevier B.V. All rights reserved.
关键词	EDDY-COVARIANCE MEASUREMENTS PLANT-COMMUNITIES ENERGY ECOSYSTEMS EXTENSION CLIMATE CHINA TIME
英文关键词	Alpine pasture; Drought; Eddy covariance system; Grassland evapotranspiration; Lysimeter
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000370086200046
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258855
推荐引用方式 GB/T 7714	Coners, Heinz,Babel, Wolfgang,Willinghoefer, Sandra,et al. Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2016,533.
APA	Coners, Heinz.,Babel, Wolfgang.,Willinghoefer, Sandra.,Biermann, Tobias.,Koehler, Lars.,...&Leuschner, Christoph.(2016).Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau.JOURNAL OF HYDROLOGY,533.
MLA	Coners, Heinz,et al."Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau".JOURNAL OF HYDROLOGY 533(2016).