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Spatiotemporal Changes in Evapotranspiration from an Overexploited Water Resources Basin in Arid Northern China and Their Implications for Ecosystem Management

Author

Listed:
  • Jianfu Liu

    (Department of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, Fujian, China)

  • Yujiu Xiong

    (School of Civil Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China
    Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China, Sun Yat-sen University, Guangzhou 510275, Guangdong, China)

  • Jianlin Tian

    (School of Civil Engineering and Architecture, Jishou University, Zhangjiajie 427000, Hunan, China
    School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China)

  • Zhihang Tan

    (School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China)

Abstract

Evapotranspiration (ET), including evaporation from soil and water surfaces and transpiration from vegetation, influences water distribution in the soil-plant-atmosphere continuum, especially in arid areas where water is a key limiting factor. Therefore, understanding the spatiotemporal dynamics of ET, including its two components of soil evaporation (Es) and vegetation transpiration (Ec), can be useful for water resource management and ecological restoration in arid regions. Based on ET data from 2002 to 2012, the spatiotemporal variations in ET were evaluated in the Shiyang River Basin in arid Northwest China. The results showed the following: (1) spatially, ET decreased from upstream of the Qilian Mountains to the middle and downstream, with a mean annual value of 316 mm; (2) temporally, ET showed a single peak curve throughout the year, with the highest value occurring in summer; (3) ET showed a downward trend (from 350 to 265 mm) before 2009 and thereafter increased (from 265 to 345 mm); and (4) water use efficiency, indicated by the ratio of Ec to ET, was low in the cropland, with a mean value of 50.9%. Further analysis indicates that decreases in ET are mainly caused by vegetation decreases; in contrast, ecological restriction measures and strict water resource management policies in the middle reaches of the basin led to ET increases. It is concluded that understanding ET and its two components can elucidate the connections between water and human society.

Suggested Citation

  • Jianfu Liu & Yujiu Xiong & Jianlin Tian & Zhihang Tan, 2019. "Spatiotemporal Changes in Evapotranspiration from an Overexploited Water Resources Basin in Arid Northern China and Their Implications for Ecosystem Management," Sustainability, MDPI, vol. 11(2), pages 1-13, January.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:2:p:445-:d:198129
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    References listed on IDEAS

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    1. Guoting Geng & Robin Wardlaw, 2013. "Application of Multi-Criterion Decision Making Analysis to Integrated Water Resources Management," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(8), pages 3191-3207, June.
    2. Zhang, Yongqiang & Kendy, Eloise & Qiang, Yu & Changming, Liu & Yanjun, Shen & Hongyong, Sun, 2004. "Effect of soil water deficit on evapotranspiration, crop yield, and water use efficiency in the North China Plain," Agricultural Water Management, Elsevier, vol. 64(2), pages 107-122, January.
    3. Giorgos Papadavid & Diofantos Hadjimitsis & Leonidas Toulios & Silas Michaelides, 2013. "A Modified SEBAL Modeling Approach for Estimating Crop Evapotranspiration in Semi-arid Conditions," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 27(9), pages 3493-3506, July.
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