Through taking 26 districts and counties in the Three Gorges Reservoir Area as the research objects,the study analyzes the spatial and temporal distribution of agriculture in the reservoir area from 2011 to 2021,uses ArcGIS for spatial visualization,and analyzes agricultural pollution and its influencing factors in the Three Gorges Reservoir Area with grey correlation model.From 2011 to 2021,the amount of agricultural fertilizer applied in the Three Gorges Reservoir Area showed a change trend of first increase and then decrease,the overall number of pig production showed a trend of decline,the overall number of poultry production and poultry egg production showed a trend of increase,the overall use of pesticides showed a trend of decline,the total agricultural product showed a trend of growth,and the rural population decreased year by year.According to the analysis of the influencing factors of agricultural non-point source pollutants in the Three Gorges Reservoir Area from 2011 to 2021,the rural population has the greatest impact on agricultural non-point source pollution,and the highest correlation degree is 0.858,followed by crop sown area,ratio of grain to economy,total agricultural output value,agriculture,forestry,animal husbandry and fishery.The correlation degree is 0.852,0.702,0.556 and 0.555,respectively.This shows that the total output value of agriculture,forestry,livestock,and fishery has the least influence on agricultural non-point source pollution.In terms of correlation degree,agricultural population has the greatest impact on agricultural non-point source pollution.Agriculture,forestry,animal husbandry and fishery have the least impact on agricultural non-point source pollution.
关键词
三峡库区/空间可视化/灰色关联模型/影响因素
Key words
Three Gorges Reservoir Area/Spatial visualization/Grey correlation model/Influencing factor
维普
万方数据