Spatial-temporal Characteristics and Treatment Countermeasures of Agricultural Non-point Source Pollution in Hubei Province
The total amount of chemical oxygen demand(COD),total nitrogen(TN)and total phosphorus(TP)emissions and emission intensity of 17 prefectures(cities)in Hubei province from 2010 to 2020 were calculated by inventory analysis method,standard pollution method and GIS tech-nology,and their temporal and spatial variation characteristics were analyzed.The results showed that the total COD,TN and TP emissions in Hubei province showed a significant downward trend in 2010-2020,and the reductions of COD,TN,TP and total pollutants were 9.29%,21.54.%,17.38%and 13.87%,respectively.The main pollution source of COD is livestock and poultry breeding;the main pollution sources of TN and TP are farmland fertilizer and livestock and poultry breeding;the contribution rate of farmland solid waste is relatively low;and the aquaculture pollu-tion production shows a clear upward trend.In 2010-2020,the emission of agricultural non-point source pollution in Hubei province showed a significant downward trend,and the contribution rate of 3 types of pollutants to the total pollutants was TN＞TP＞COD,TN and TP were key pollutants.The contribution rate of pollution production of the five types of pollution sources is farmland fertilizer＞livestock and poultry breeding＞rural life＞aquaculture＞farmland solid waste,and farmland fertilizer and livestock and poultry breeding are the key pollution sources.The emission intensity of agricul-tural non-point source pollution in Hubei province has strong regional differentiation characteristics,and the pollution degree is"eastern＞western＞central"in terms of space affected by topography,climate and water resources.
agricultural non-point source pollutionspatiotemporal characteristicsgovernance re-sponsesHubei province
国家科技期刊平台
NSTL
万方数据
维普
