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Actual daily evapotranspiration and crop coefficients for an alpine meadow in the Qilian Mountains, northwest China

Yong Yang, Rensheng Chen, Yaoxuan Song, Chuntan Han, Jiufeng Liu, Zhangwen Liu
Available Online 29 July 2016, nh2016124; DOI: 10.2166/nh.2016.124
Yong Yang
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Rensheng Chen
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Yaoxuan Song
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Chuntan Han
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Jiufeng Liu
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Zhangwen Liu
Qilian Alpine Ecology and Hydrology Research Station, Key Laboratory of Ecohydrology Inland River Basin, Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China E-mail: yy177@lzb.ac.cn
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Abstract

Actual daily evapotranspiration (ETa) was measured in two weighing micro-lysimeters, from 1 July 2009 to 30 June 2011 on an alpine meadow in the Qilian Mountains, northwest China. The findings showed that the mean daily ETa in the unfrozen and frozen periods was 2.0 mm and 0.2 mm, respectively. The dominant factor affecting ETa in the unfrozen period was net radiation (RN), whereas those in the frozen period were soil surface temperature (Ts) and air temperature (Ta). The mean value of the daily crop coefficient (Kc) was 0.82 in the unfrozen period, and 0.19 in the frozen period. Regression analysis of Kc and the environmental variables indicated that Ta, Ts, relative humidity and soil surface water content (SWC), rather than RN, were the major factors influencing Kc throughout the whole measurement period and in the unfrozen period, although no clear correlative relationships were found between Kc and meteorological factors in the frozen period. Three daily empirical ETa models for an alpine meadow were developed, also utilizing the FAO-56 Penman–Monteith approach to estimate reference evapotranspiration. They all exhibited good performances in the unfrozen period, but none were found suitable for the frozen period.

  • crop coefficient
  • evapotranspiration
  • micro-lysimeter
  • mountainous region
  • First received 14 January 2016.
  • Accepted in revised form 11 June 2016.
  • © IWA Publishing 2016

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Hydrology Research: 49 (2)
  Volume 49,issue 2

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Actual daily evapotranspiration and crop coefficients for an alpine meadow in the Qilian Mountains, northwest China
Yong Yang, Rensheng Chen, Yaoxuan Song, Chuntan Han, Jiufeng Liu, Zhangwen Liu
Hydrology Research Jul 2016, nh2016124; DOI: 10.2166/nh.2016.124
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Actual daily evapotranspiration and crop coefficients for an alpine meadow in the Qilian Mountains, northwest China
Yong Yang, Rensheng Chen, Yaoxuan Song, Chuntan Han, Jiufeng Liu, Zhangwen Liu
Hydrology Research Jul 2016, nh2016124; DOI: 10.2166/nh.2016.124

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Keywords

crop coefficient
evapotranspiration
micro-lysimeter
mountainous region
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