| Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River,China |
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| 作者姓名： | CHEN Yaning ZHANG Xiaolei ZHU Xiangmin LI Weihong ZHANG Yuanming XU Hailiang ZHANG Hongfeng & CHEN Yapeng .Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi China .Management Beureau od Tarim River Basin Kurle China Correspondence should be addressed to Chen Yaning |
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| 基金项目： | 国家自然科学基金，中国科学院知识创新工程项目 |
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| 摘 要： | Water is the foundation of the composition, de-velopment and stability of the oasis ecosystems in thearid areas, and is the key ecological factor in the aridareas. The study results showed that in the arid areasthe biological process is weak, the biological ecosys-tems are small in scale and low in stability1— . So the 9]growth of the natural vegetation is directly influencedby the change of groundwater level, leading to thedegradation of ecosystem10,11]. Analysis on the rela-tionship betwe…
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| 收稿时间： | 21 October 2007 |
Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River,China |
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| CHEN Yaning,ZHANG Xiaolei,ZHU Xiangmin,LI Weihong,ZHANG Yuanming,XU Hailiang,ZHANG Hongfeng & CHEN Yapeng .Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi ,China,.Management Beureau od Tarim River Basin,Kurle ,China Correspondence should be addressed to Chen Yaning.Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River,China[J].Science in China(Earth Sciences),2004,47(11):1053-1064. |
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| Authors: | Email author" target="_blank">Yaning?ChenEmail author Xiaolei?Zhang Xiangmin?Zhu Weihong?Li Yuanming?Zhang Hailiang?Xu Hongfeng?Zhang Yapeng?Chen |
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| Institution: | 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
2. Management Beureau od Tarim River Basin, Kurle 831102, China |
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| Abstract: | This paper analyzes the monitored data of the 4 times of stream water conveyances to the river section where the stream flow
was cut-off, of 9 groundwater-monitoring sections and 18 vegetation plots in the lower reaches of Tarim River. The results
show that the groundwater depth in the lower reaches of Tarim River rose from 9.87 m before the conveyances to 7.74 m and
3.79 m after the first and second conveyances, 3.61 and 3.16 m after the 2 phases of the third conveyance, and 2.66 m after
the fourth conveyance. The transverse response scope of groundwater level was gradually enlarged along both sides of the channel
of conveyances, i.e., from 450 m in width after the first conveyance to 1050 m after the fourth conveyance, but the response
degree of groundwater level was reduced with the increase of the distance away from the channel of conveyances. The composition,
distribution and growth status of the natural vegetation are directly related to the groundwater depth. The indexes of Simpson’s
biodiversity, McIntosh’s evenness and Margalef’s richness, which reflect the change of the quantity of species and the degree
of biodiversity, are reduced from 0.70, 0.48 and 0.90 to 0.26, 0.17 and 0.37 respectively along with the drawdown of groundwater
level from the upper reaches to the lower reaches. After the stream water conveyances, the natural vegetation in the lower
reaches is saved and restored along with the rise of groundwater level, the response scope of vegetation is gradually enlarged,
i.e., from 200-250 m in width after the first conveyance to 800 m after the fourth conveyance. However, there is still a great
disparity to the objective of protecting the “Green Corridor” in the lower reaches of Tarim River. Thus, it is suggested to
convey the stream water in double-channel way, combine the conveyance with water supply in surface scope, or construct the
modern pipe-conveyance network systems so as to save the natural vegetation in an intensive way, achieve the efficient water
consumption and speed up the restoration and regeneration of the damaged ecosystems in the lower reaches of Tarim River. |
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| Keywords: | stream flow cut-off river section stream water conveyance groundwater level natural vegetation ecological benefit Tarim River |
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