| Study on vegetation ecological water requirement in Ejina Oasis |
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| 作者姓名： | ZHAO WenZhi CHANG XueLi HE ZhiBin & ZHANG ZhiHui Laboratory of Watershed Hydrology and Ecology Cold and Arid Regions Environmental and Engineering Research Institute Chi-nese Academy of Sciences Lanzhou China Linze Inland River Basin Comprehensive Research Station Chinese Ecosystem Research Network Lanzhou China Geography and Resource Management College Ludong University Yantai China |
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| 作者单位： | ZHAO WenZhi1，2，CHANG XueLi3，HE ZhiBin1，2 & ZHANG ZhiHui1，2 1 Laboratory of Watershed Hydrology and Ecology，Cold and Arid Regions Environmental and Engineering Research Institute，Chi-nese Academy of Sciences，Lanzhou 730000，China; 2 Linze Inland River Basin Comprehensive Research Station，Chinese Ecosystem Research Network，Lanzhou 730000，China; 3 Geography and Resource Management College，Ludong University，Yantai 264025，China |
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| 基金项目： | 中国科学院知识创新工程项目;国家自然科学基金 |
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| 摘 要： | The Ecological Water Requirement (EWR) of desert oasis is the amount of water required to maintain a normal growth of vegetation in the special ecosystems. In this study EWR of the Ejina desert oasis is estimated through the relational equation between normalized difference vegetation index (NDVI), productivity and transpiration coefficient, which was established by a combination of the RS, GIS, GPS techniques with the field measurements of productivity. The results show that about 1.53×108 m3 water would be needed to maintain the present state of the Ejina Oasis, and the ecological water requirement would amount to 3.49×108 m3 if the existing vegetation was restored to the highest productivity level at present. Considering the domestic water requirement, river delivery loss, oasis vegetation water con-sumption, farmland water demand, precipitation recharge, etc., the draw-off discharge of the Heihe River (at Longxin Mount) should be 1.93×108―2.23 ×108 m3 to maintain the present state of the Ejina Oasis, and 4.28×108―5.17×108 m3 to make the existing vegetation be restored to the highest productiv-ity level at present.
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| 收稿时间： | 20 March 2006 |
| 修稿时间： | 8 August 2006 |
Study on vegetation ecological water requirement in Ejina Oasis |
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| ZHAO WenZhi,,CHANG XueLi,HE ZhiBin, & ZHANG ZhiHui, Laboratory of Watershed Hydrology and Ecology,Cold and Arid Regions Environmental and Engineering Research Institute,Chi-nese Academy of Sciences,Lanzhou ,China, Linze Inland River Basin Comprehensive Research Station,Chinese Ecosystem Research Network,Lanzhou ,China, Geography and Resource Management College,Ludong University,Yantai ,China.Study on vegetation ecological water requirement in Ejina Oasis[J].Science in China(Earth Sciences),2007,50(1):121-129. |
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| Authors: | Zhao WenZhi Chang XueLi He ZhiBin Zhang ZhiHui |
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| Institution: | 1. Laboratory of Watershed Hydrology and Ecology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;Linze Inland River Basin Comprehensive Research Station, Chinese Ecosystem Research Network, Lanzhou 730000, China
2. Geography and Resource Management College, Ludong University, Yantai 264025, China |
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| Abstract: | The Ecological Water Requirement (EWR) of desert oasis is the amount of water required to maintain a normal growth of vegetation
in the special ecosystems. In this study EWR of the Ejina desert oasis is estimated through the relational equation between
normalized difference vegetation index (NDVI), productivity and transpiration coefficient, which was established by a combination
of the RS, GIS, GPS techniques with the field measurements of productivity. The results show that about 1.53×108 m3 water would be needed to maintain the present state of the Ejina Oasis, and the ecological water requirement would amount
to 3.49×108 m3 if the existing vegetation was restored to the highest productivity level at present. Considering the domestic water requirement,
river delivery loss, oasis vegetation water consumption, farmland water demand, precipitation recharge, etc., the draw-off
discharge of the Heihe River (at Longxin Mount) should be 1.93×108–2.23×108 m3 to maintain the present state of the Ejina Oasis, and 4.28×108–5.17×108 m3 to make the existing vegetation be restored to the highest productivity level at present.
Spported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-329) and the National
Natural Science Foundation of China (Grant No. 40235053) |
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| Keywords: | Ejina Oasis NDVI productivity pattern vegetation ecological water requirement |
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