三峡库区面源污染的时空特征及EKC分析

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Abstract Total Nitrogen(TN) and total phosphorous(TP) emissions of agricultural non-point source pollution in 19 regions of the Three Gorges Reservoir Area(TGRA) were estimated from 2008 to 2018. Their spatial-temporal variation characteristics were further analyzed. According to Environmental Kuznets Curve (EKC) theory, a regression model based on panel data was constructed to explore the relationship between agricultural economy development and non-point source pollution emission intensity in TGRA. Our study found that TN emissions of agriculture decreased with fluctuation, and TP increased with fluctuation in TGRA. The average annual emissions of TN and TP in each region ranged from 374~6046 tons and 105~1267 tons respectively. Agricultural fertilizer and livestock breeding units contributed to more than 80% of total TN and TP. There were significant "inverted U-shape" EKC relationships to TN emission intensity, TN/TP emission intensity in livestock & poultry breeding unit and rural living unit, indicating that the turning points have been showed in these curves. There were significant "linear" EKC relationships to TP emission intensity in agricultural fertilizer unit, TN/TP emission intensity in aquaculture unit and farmland solid-waste unit, indicating a simultaneous growth with economy. The research finally proposed that agricultural fertilizer unit should upgrade the pollution prevention capacity, so as to improve rural living environment and reduce regional TN and TP emission.

Key words： agricultural non-point source pollution unit analysis method Environmental Kuznets Curve (EKC) Three Gorges reservoir area(TGRA)

Received: 17 December 2021

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X501

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	FENG Lin
	ZHANG Wan-ting
	ZHANG Jun-ke
	MAO Xin-hui
	YU Xin
	YE Cheng-song
	CHANG Tian-yang

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FENG Lin,ZHANG Wan-ting,ZHANG Jun-ke等. Analysis on spatial-temporal characteristics and Environmental Kuznets Curve of non-point source pollution in the Three Gorges Reservoir Area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3325-3333.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3325

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