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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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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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Authors and Affiliations

  1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011, Urumqi, China

    Yaning Chen, Xiaolei Zhang, Weihong Li, Yuanming Zhang, Hailiang Xu, Hongfeng Zhang & Yapeng Chen

  2. Management Beureau od Tarim River Basin, 831102, Kurle, China

    Xiangmin Zhu

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  1. Yaning Chen
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  2. Xiaolei Zhang
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  3. Xiangmin Zhu
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  4. Weihong Li
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  5. Yuanming Zhang
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  6. Hailiang Xu
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  7. Hongfeng Zhang
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  8. Yapeng Chen
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Correspondence to Yaning Chen.

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Chen, Y., Zhang, X., Zhu, X. et al. Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River, China. Sci. China Ser. D-Earth Sci. 47, 1053–1064 (2004). https://doi.org/10.1360/03yd0101

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  • DOI: https://doi.org/10.1360/03yd0101

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