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学科主题: 地理学::自然地理学
题名: Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau
作者: Coners, H (Coners, Heinz)1; Babel, W (Babel, Wolfgang)2, 3, 4; Willinghofer, S (Willinghoefer, Sandra)1; Biermann, T (Biermann, Tobias)2, 9; Kohler, L (Koehler, Lars)1; Seeber, E (Seeber, Elke)5, 8; Foken, T (Foken, Thomas)2, 4; Ma, YM (Ma, Yaoming)6; Yang, YP (Yang, Yongping)7; Miehe, G (Miehe, Georg)8; Leuschner, C (Leuschner, Christoph)1
通讯作者: Leuschner, C
刊名: JOURNAL OF HYDROLOGY
发表日期: 2016
DOI: 10.1016/j.jhydrol.2015.12.021
卷: 533, 期:0, 页:557-566
收录类别: SCI
合作性质: 国际
文章类型: Article
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.
语种: 英语
WOS记录号: WOS:000370086200046
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7768
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Univ Gottingen, Plant Ecol & Ecosyst Res, D-37073 Gottingen, Germany
2.Univ Bayreuth, Dept Micrometeorol, Bayreuth, Germany
3.Univ Bayreuth, Grp Micrometeorol, Bayreuth, Germany
4.Univ Bayreuth, Bayreuth Ctr Ecol & Environm Res, Bayreuth, Germany
5.Senckenberg Museum Nat Hist Gorlitz, Dept Bot, Gorlitz, Germany
6.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing, Peoples R China
7.Chinese Acad Sci, Key Lab Plant Divers & Biogeog East Asia, Kunming Inst Bot, Kunming, Peoples R China
8.Univ Marburg, Fac Geog, D-35032 Marburg, Germany
9.Lund Univ, Ctr Environm & Climate Res, Lund, Sweden

Recommended Citation:
Coners, H ,Babel, W ,Willinghofer, S ,et al. Evapotranspiration and water balance of high-elevation grassland on the Tibetan Plateau[J]. JOURNAL OF HYDROLOGY,2016,533(0):557-566.
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