基于冗余分析的城市河湖水污染成因及尺度效应

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Abstract The relation between the factors potentially causing pollution of urban water bodies and the quality of the water was analyzed based on redundancy analysis method. The basin of Dongsha lake at the central urban area of Wuhan was selected as the target area. Ten characteristics of rainfall and the underlying surface were selected as the factors and 18water quality indicators were selected as the response variables. The results showed that the ratios of the areas of impermeable pavement and river water are the main factors and the contribution rates were 0.703 and 0.652, respectively. The ratio of urban road area was the main factor when the size of buffer was more than 3000 m and the contribution rate was 0.796. Spatial distribution of rainfall had a contribution rate lower than 0.371 and was not the main factor. The scale of buffer had influence on determination of the factors and such an influence was closely related to the presence or absence of the drainage system and the area of the hydrological catchment unit. The river and lake pollution in the basin of Dongsha lake was due to the non-point source pollution at the surface of the impermeable pavement and the point source pollution at the discharge points of the drainage system. The ratio of the area of rivers was the key factor to improve water quality.

Key words： causes of water pollution underlying surface rainfall water quality indicators scale effect city

Received: 15 March 2022

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	LIU Shu-ying
	ZHANG Xiang
	XU Jing
	GU Fang-hua
	JIA Hai-feng

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LIU Shu-ying,ZHANG Xiang,XU Jing等. Analysis of the causes for pollution of urban river and lake waters based on the redundancy analysis method and the influence from selection of scales[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4768-4779.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4768

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