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DOI10.1016/j.jhydrol.2015.09.013
Environmental and biophysical controls on the evapotranspiration over the highest alpine steppe
Ma, Ning; Zhang, Yinsheng; Guo, Yanhong; Gao, Haifeng; Zhang, Hongbo; Wang, Yefan
通讯作者Ma, N (通讯作者)
发表日期2015
ISSN0022-1694
EISSN1879-2707
起始页码980
结束页码992
卷号529
英文摘要Characterizing the water and energy flux in the alpine steppe ecosystem in Tibetan Plateau (TP) is of particular importance for elucidating hydrological cycle mechanisms in high altitude areas. In the present study, two years of actual evapotranspiration (ET) values from a semi-arid alpine steppe region (4947 m above sea level) and their environmental and biophysical controls were investigated using the energy balance Bowen ratio energy balance (BREB) method. Seasonally, ET was much lower in frozen soil period and transition period mainly because of low soil water availability. However, ample soil water supplied by rainfall during the rainy period substantially increased ET. The available energy played an important role in controlling ET in the rainy period. Also, the leaf-level stomata closure and plant leaf development could impact the ET through changing bulk surface conductance (G(s)) in rainy period. Similarly, the land-atmosphere energy exchange was dominated by latent heat flux (lambda E) in July, but was dominated by sensible heat flux (H) in December and May. Annual ET (plus sublimation) were 362.9 mm and 353.4 mm in the first and second observation year, respectively, which were close to the annual precipitation. On annual scale, the low G(s) (3.30-3.62 mm s(-1)), decoupling factor (Omega, 0.25-0.27) and the ratio of ET to equilibrium evapotranspiration (ET/ETeq, 0.34-0.35) corroborated the overall water-limited conditions for the high-altitude alpine steppe. This research provides not only the ground truth data for future hydrological modeling in the data scarce region of TP but also the insights for elucidating how the environmental and biophysical stress factors control the land surface ET in high-altitude region. (C) 2015 Elsevier B.V. All rights reserved.
关键词SURFACE-ENERGY FLUXESWATER-VAPOR EXCHANGETIBETAN PLATEAUDECIDUOUS FORESTINNER-MONGOLIAINTERANNUAL VARIATIONSPARSE GRASSLANDUSE EFFICIENCYBALANCE METHODLONG-TERM
英文关键词Evapotranspiration; Bulk surface conductance; Decoupling factor; Alpine steppe; Tibetan Plateau
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:000364249500024
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/258451
推荐引用方式
GB/T 7714
Ma, Ning,Zhang, Yinsheng,Guo, Yanhong,et al. Environmental and biophysical controls on the evapotranspiration over the highest alpine steppe[J]. 中国科学院青藏高原研究所,2015,529.
APA Ma, Ning,Zhang, Yinsheng,Guo, Yanhong,Gao, Haifeng,Zhang, Hongbo,&Wang, Yefan.(2015).Environmental and biophysical controls on the evapotranspiration over the highest alpine steppe.JOURNAL OF HYDROLOGY,529.
MLA Ma, Ning,et al."Environmental and biophysical controls on the evapotranspiration over the highest alpine steppe".JOURNAL OF HYDROLOGY 529(2015).
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