Analysis on the relationship between fish diversity and watershed features in the Yangtze River Basin

SHI Ruijie; TANG Lihua; GAO Guangdong; YANG Dawen; XU Xiangyu

doi:10.16511/j.cnki.qhdxxb.2018.22.033

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Journal of Tsinghua University(Science and Technology) ›› 2018, Vol. 58 ›› Issue (7) : 650-657. DOI: 10.16511/j.cnki.qhdxxb.2018.22.033

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Analysis on the relationship between fish diversity and watershed features in the Yangtze River Basin

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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.

Key words

river water ecosystem / fish diversity / watershed features / multiple stepwise regression / gray correlation analysis

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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[J]. Journal of Tsinghua University(Science and Technology). 2018, 58(7): 650-657 https://doi.org/10.16511/j.cnki.qhdxxb.2018.22.033

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