In order to better improve the quality of water environment,it is necessary to explore the nonpoint source pollution situation in Weifang.With the help of ENVI and ArcGIS software,combined with network data and field re-search,the improved output coefficient model was utilized to estimate the nonpoint source pollution load of total nitro-gen(TN)and total phosphorus(TP)in Weifang from 2004 to 2020 to analyze its spatial and temporal change charac-teristics and pollution sources and evaluate the degree of nitrogen and phosphorus pollution by the method of load coeffi-cient per unit area.The results are as follows.The non-point source pollution load of nitrogen and phosphorus in Wei-fang City shows a decreasing and then increasing trend,and the total pollution load of TN is 7.15～7.37 times of that of TP.The overall distribution is uneven,showing ＂low in the middle and high in the surroundings＂.Residential life and land use are the main sources of pollution,of which,arable land is the most significant source of pollution.Nitro-gen and phosphorus pollution in Weifang City has a greater impact on the environment.
关键词
非点源污染/污染负荷/改进输出系数模型/总氮/总磷/潍坊地区
Key words
non-point source pollution/pollution loads/improved output coefficient model/total nitrogen/to-tal phosphorus/Weifang City
维普
万方数据