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Water consumption in artificial desert oasis based on net primary productivity

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Abstract

Analysis of the water consumption is the basis for water allocation in oasis. However, the method of estimating oasis water consumption remains a great challenge. Based on net primary productivity (NPP) and the transpiration coefficient, a vegetation water consumption model was developed to estimate the water consumption in desert oasis in ERDAS environment. Our results demonstrated that the ecosystem in the middle reaches of the Heihe oasis consumed water of 18.41×108–21.9×108 m3 for irrigation. Without taking precipitation into account, the water consumption in farmland accounted for 77.1%–77.8% (or about 13.97×108–16.84×108 m3) of the oasis vegetation water consumption and in the farmland protection system accounting for 22%. The growing period precipitation in desert environments is about 7.02×10u m3, and the total annual precipitation is about 8.29×108 m3. The modeled water consumption of desert vegetation, however, is about 4.57×108 m3, equivalent to only 65% of the growing period precipitation or 55% of the total annual precipitation. The modeled value equals to the cumulative precipitation of greater than 5 mm, which is defined as the effective precipitation in arid desert.

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Authors and Affiliations

  1. Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China

    WenZhi Zhao, ZuiRong Niu & ShouBo Li

  2. Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, Lanzhou, 730000, China

    WenZhi Zhao & ShouBo Li

  3. Geography and Resource Management College, Ludong University, Yantai, 264025, China

    XueLi Chang

Authors
  1. WenZhi Zhao
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  2. ZuiRong Niu
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  3. XueLi Chang
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  4. ShouBo Li
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Correspondence to WenZhi Zhao.

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Zhao, W., Niu, Z., Chang, X. et al. Water consumption in artificial desert oasis based on net primary productivity. Sci. China Earth Sci. 53, 1358–1364 (2010). https://doi.org/10.1007/s11430-010-4028-6

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  • DOI: https://doi.org/10.1007/s11430-010-4028-6

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