基于GIS的菏泽市农业面源污染时空分布

Spatial and temporal distribution of agricultural non-point source pollution in Heze City based on GIS

为了揭示菏泽市农业面源污染的关键污染源和主要污染区,采用GIS技术分析了菏泽市2012-2021年的统计数据,绘制了污染物空间分布图,核算了污染排放量,分析了农业面源污染的时空分布特征。结果表明:菏泽市化肥施用强度逐年降低,但仍高于国际化肥预警值(225 kg·hm^(-2)),西北部地区污染较为严重;禽类养殖数量逐渐升高,北部和西部畜禽污染处于中度污染范围;2015年后,化肥和农药的投入量稳步降低,降幅分别达到12.52%和18.91%。

In order to reveal the key pollution sources and main pollution areas of agricultural non-point source pollution in Heze City,the statistical data of Heze City from 2012 to 2021 was analyzed with GIS technology.The spatial distribution map of pollutants was drawn,the pollution emissions were calculated,and the temporal and spatial distribution characteristics of agricultural non-point source pollution were analyzed.The results showed that the application intensity of chemical fertilizer in Heze City decreased year by year,but it was still higher than the international early warning value of chemical fertilizer(225 kg·hm^(-2)).The chemical fertilizer pollution in the northwest of Heze City was more serious than the other areas.The number of poultry breeding gradually increased.The level of livestock and poultry pollution in the north and west of Heze City was medium pollution.After 2015,the use of chemical fertilizer and pesticide steadily decreased by 12.52%and 18.91%,respectively.