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DOI | 10.1016/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 |
ISSN | 0022-1694 |
EISSN | 1879-2707 |
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
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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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