Decoupling relationship between agricultural wastewater non-point source pollution and agricultural economic growth in the Yangtze River Economic Belt
PENG Jia-chao1, XIAO Jian-zhong1, LI Gang2, YI Ming1
1. School of Economics and Management, China University of Geosciences(Wuhan), Wuhan 430074, China;
2. School of Management and Economics, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
It is an urgent requirement for achieving high-quality agricultural economic development to promote the decoupling of agricultural wastewater non-point source pollution from agricultural economic growth in the Yangtze River Economic Belt. The decoupling relationship and its evolution trend were analyzed between ammonia emissions, chemical oxygen demand, total phosphorus, and total nitrogen emissions from agricultural wastewater in the Yangtze River Economic Belt from 2011 to 2016. The results showed that: the total decoupling index of non-point source pollution was small and less than 0 in Yangtze River Economic Belt, but the decoupling degree of each pollution source has been deteriorated from 2015 to 2016. In terms of statistical results by province, the decoupling of ammonia emissions and chemical oxygen demand were expansion negative decoupling in agricultural wastewater in Sichuan. The chemical oxygen demand emissions were absolute decoupling in Guizhou, Jiangsu, Jiangxi, Shanghai, Yunnan, and Chongqing. The provinces and cities were mainly located in the middle reaches of the Yangtze River Economic Belt with absolute decoupling of pollutant emissions. There were obvious about heterogeneous spatial boundary spillover effects of Chemical Oxygen Demand, homogeneous spillover effects of total phosphorus and total nitrogen. Moran's I of non-point source pollution emissions from agricultural wastewater increases with distance, but as the geographic distance of the spatial boundary increases, the spatial spillover effect of agricultural wastewater non-point source pollution in the Yangtze River Economic Belt pulses decreases. The long-term impact of ammonia emissions, chemical oxygen demand, total phosphorus and total nitrogen were U-shaped trend on agricultural economic growth. Effects greatest contribution was the chemical oxygen demand, followed by ammonia emissions, total phosphorus and total nitrogen, and the continued positive impact of total phosphorus.
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