Analysis on the relationship between fish diversity and watershed features in the Yangtze River Basin
SHI Ruijie1, TANG Lihua1, GAO Guangdong2, YANG Dawen1, XU Xiangyu3
1. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China; 2. Hydrology Bureau of Liaocheng, Shandong, Liaocheng 252000, China; 3. China Renewable Energy Engineering Institute of the Ministry of Water Resources, Beijing 100120, China
Abstract：Fish diversity is a key indicator of the quality of a river water ecosystem. This study used the fish diversity to analyze the main factors influencing the Yangtze River water ecosystem. A correlation analysis and a gray correlation analysis were used to identify the main factors influencing the fish diversity. A quantitative relationship between the fish diversity and the watershed features was developed using a multiple variable regression. The results show that the main factors influencing the fish diversity in the mainstream and its tributaries in the upper reaches of the Yangtze River are natural factors such as elevation and basin area. Runoff is the main factor influencing the mainstream and its tributaries in the upper reaches except Tongtian, the upper part of Jinsha River and the Yalong River with altitude exceeding 3 500 m. The main factor influencing the fish diversity in the middle and lower reaches is land use types. The transition of the key factors from natural factors to land use types reflects the increasing influence of human activities on the river water ecosystem.
石睿杰, 唐莉华, 高广东, 杨大文, 徐翔宇. 长江流域鱼类多样性与流域特性关系分析[J]. 清华大学学报（自然科学版）, 2018, 58(7): 650-657.
SHI Ruijie, TANG Lihua, GAO Guangdong, YANG Dawen, XU Xiangyu. Analysis on the relationship between fish diversity and watershed features in the Yangtze River Basin. Journal of Tsinghua University(Science and Technology), 2018, 58(7): 650-657.
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2018, Vol. 58 
