Temporal and spatial characteristics of cultivated land non-point source pollution in the main grain-producing areas of the middle and lower Yangtze region
Temporal and spatial characteristics of cultivated land non-point source pollution in the main grain-producing areas of the middle and lower Yangtze region
In order to reveal the temporal and spatial patterns of non-point source pollution in cultivated land within the main grain-producing areas of the middle and lower reaches of the Yangtze River,we used statistical data for 58 cities(prefectures and districts)in this area from 2009 to 2019.These data were analyzed using spatial analysis models,barycenter models,cold and hot spot analysis,and other methods.The results revealed that the total amount and intensity of cultivated land non-point source pollution in the middle and lower Yangtze region and the four provinces of Jiangxi,Hunan,Hubei,and Anhui from 2009 to 2019 showed a trend of an initial rise and subsequent fall,among which the intensity and total amount of cultivated land non-point source pollution in Hubei Province were the most pronounced.From 2009 to 2019,the non-point source pollution intensity of cultivated land was generally characterized by a spatial distribution that was high in the west and low in the east,of which Jiangxi Province generally remained a low pollution area,whereas Hubei Province was found to be an area of high pollution concentrations.The change of the center of gravity of the non-point source pollution intensity of the cultivated land is characterized by the law of"interval shock",and the shift in the center of gravity of the non-point source pollution intensity of the cultivated land shows obvious stage characteristics.From 2009 to 2019,the non-point source pollution intensity of cultivated land showed an obvious spatial gathering trend,which was generally characterized by a spatial distribution pattern of cold in the east and hot in the west.On the basis of these findings,we established that in order to coordinate the dual goals of national food security and the ecological security of cultivated land,the middle reaches of the Yangtze River Basin,particularly the provinces of Hubei and Hunan,are key areas for further promoting the prevention and control of farmland non-point source pollution in the future.
关键词
耕地面源污染/空间分异/迁移轨迹/冷热点分析/粮食主产区/长江中下游
Key words
cultivated land non-point source pollution/spatial differentiation/migration trajectory/cold and hot spot analysis/main grain producing areas/middle and lower Yangtze region
维普
万方数据