Analysis on the ecological benefits

Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim R

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,Mclntosh'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.

作 者： CHEN Yaning Zhang Xiaolei ZHU Xiangmin LI Weihong ZHANG Yuanming XU Hailiang ZHANG Hongfeng CHEN Yapeng   作者单位： CHEN Yaning,Zhang Xiaolei,LI Weihong,ZHANG Yuanming,XU Hailiang,ZHANG Hongfeng,CHEN Yapeng(Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China)

ZHU Xiangmin(Management Beureau od Tarim River Basin, Kurle 831102, China) 

刊 名： 中国科学D辑（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES D  年，卷(期)： 2004 47(11)  分类号： P3  关键词： stream flow cut-off river section   stream water conveyance   groundwater level   natural vegetation   ecological benefit   Tarim River  

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