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Models for calculating phreatic water evaporation on bare and Tamarix-vegetated lands

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Chinese Science Bulletin

Abstract

Groundwater is the main source of water consumption of natural vegetation in arid regions. It is an effective approach to study ecological water demand of natural vegetation by phreatic evaporation. In order to study the ecological water demand of Tarim river basin, based on the observation data of phreatic evaporation on bare lands at the Aksu Water Balance Experimental station from 1989 to 1996, by analyzing the relationship of phreatic evaporation, depth of phreatic surface and evaporation of water, taking the limit rate of phreatic evaporation as the control condition, and based on the objective law that the relation between phreatic evaporation and evaporation of water is nonlinear, we establish models for calculating phreatic evaporation on bare land, which can fully reflect the law of phreatic evaporation in the Tarim river basin. According to the data of depth of phreatic surface and soil moisture when pheratic level decline is caused just by evapotranspiration on Tamarix-vegetated land from 2003 to 2004, we calculate the amount of phreatic evapora-tion and set up models for calculating phreatic evaporation on Tamarix-vegetated land. Phreatic evaporation on bare land and Tamarix-vegetated land could be transformed each other by a Tamarix vegetation conversion coefficient. The test results show that the calculation accuracy of the models is high and the models are suitable for Tarim river basin.

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Authors and Affiliations

  1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, 830011, China

    Hu Shunjun, Tian Changyan, Song Yudong & Li Yuetan

  2. Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Chinese Ministry of Education, Yangling, 712100, China

    Hu Shunjun

  3. Institute of Soil, Chinese Academy of Sciences, Nanjing, 210008, China

    Chen Xiaobing

  4. Graduate School of Chinese Academy of Sciences, Beijing, 100039, China

    Li Yuetan

Authors
  1. Hu Shunjun
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  2. Tian Changyan
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  3. Song Yudong
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  4. Chen Xiaobing
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  5. Li Yuetan
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Corresponding author

Correspondence to Hu Shunjun.

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Hu, S., Tian, C., Song, Y. et al. Models for calculating phreatic water evaporation on bare and Tamarix-vegetated lands. CHINESE SCI BULL 51 (Suppl 1), 43–50 (2006). https://doi.org/10.1007/s11434-006-8206-z

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  • DOI: https://doi.org/10.1007/s11434-006-8206-z

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