As a crucial national survey in China,Second National Pollution Census comprehensively verifies the discharge of various pollutants and provides data in support of the formulation of national economic and social development outlines and ecological and environmental policies.According to Second National Pollution Census Bulletins,the emissions of COD,ammonia nitrogen,total nitrogen and total phosphorus from agricultural sources accountes for 49.77%,22.44%,46.52%and 67.22%of the total national emissions,which are the main sources of water pollutants.However,there are large differences between different regions in agricultural water pollutant emissions.Therefore,it becomes an urgent problem how to dig deeper into the results of the Second National Pollution Census and scientifically assesses the water pollutant discharges from the planting-animal husbandry industry.This paper is intended to account for the gray water footprint of the planting-animal husbandry industry in 31 provinces(cities,autonomous regions,excluding Hong Kong,Macao,and Taiwan in China)based on the results of the Second National Pollution Census.And an evaluation index system and a comprehensive evaluation method was constructed,which could be used to analyze and evaluate the current situation of water pollution discharge from the planting-animal husbandry industry,and explore its characteristics and regular patterns.It was expected to provide a theoretical basis for the green development for planting-animal husbandry industry.The results showed that the total gray water footprint of the national planting industry and animal husbandry industry was 489.8 billion m3 and 684.1 billion m3 in 2017,respectively.An obvious aggregation effect in the spatial distribution was observed,showing the characteristics of'high in the South and low in the North'for planting industry,and'high in the East and low in the West'for animal husbandry industry.In the water environment pressure evaluation index,the discharge of water pollutants from the animal husbandry industry caused higher water environment pressure than the planting industry.In the comprehensive evaluation results of the gray water footprint of the planting industry,the results of Qinghai,Xinjiang,Tibet and Inner Mongolia were relatively high,while the results of Jiangsu,and Hainan were relatively low.In the animal husbandry industry,the results of Shanghai and Zhejiang were relatively high,while the results of Hebei,Tibet,Tianjin and Ningxia were relatively low.Therefore,in the future,it is urgent to reduce emissions and increase efficiency as the development goal for the planting-animal husbandry industry,and each region should adopt the corresponding methods according to the local conditions,such as,fertilizer application structure and methods should be optimized in Hainan,the production scale for planting-animal husbandry industry should be regulated scientifically to alleviate water environment pressure in the Huang-Huai-Hai region,and in the middle and lower reaches of the Yangtze River,more attention should be paid to agricultural wastewater from paddy fields.So,this research provides policy recommendations for the green development for planting-animal husbandry industry from the perspective of water environment protection in China.
gray water footprintwater environment pressureplanting industryanimal husbandry industrycom-prehensive evaluation
维普
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