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[Dynamic tendency of arid oasis under the influence of water resources decrease--a case study of Ejina oasis in Heihe
Genxu Wang1, Guodong Cheng, Yongping Shen
1Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000. gxwang@ns.lzb.ac.cn
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|August 17, 2002
Summary
Maintaining the Ejina oasis requires at least 5.7 x 10^8 m^3 of water. To preserve the current oasis area by 2015, incoming runoff must reach 6.0 x 10^8 m^3.
Area of Science:
- Hydrology and Ecology
- Arid land management
- Water resource allocation
Background:
- Arid inland river runoff changes significantly impact lower-reach oasis formations.
- The Ejina oasis in the Heihe River Basin faces dynamic changes due to water resource allocation.
Purpose of the Study:
- To analyze the dynamic tendency of the Ejina oasis under different water resource allocations.
- To estimate water demand for ecological systems and human needs within the oasis.
Main Methods:
- Oasis patches dynamic modeling
- Vegetation-water interrelated analysis
- Ecological water demand estimation
Main Results:
- Minimum water demand to preserve the current oasis area is approximately 5.7 x 10^8 m^3.
- Incoming runoff of 6.0 x 10^8 m^3 is needed at Langxinshan to maintain the oasis by 2015, accounting for human/livestock needs and water loss.
- Regaining the 1980s oasis area requires 8.9 x 10^8 m^3 incoming runoff, with Zhengyixia section runoff between 10.9 x 10^8 m^3 and 13.1 x 10^8 m^3.
Conclusions:
- Rational water resource management is crucial for oasis sustainability.
- Future water resource allocation must balance ecological, human, and livestock demands.
- Specific runoff targets are identified for preserving and restoring the Ejina oasis.
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