Spatial Coupling Coordination Analysis of Rural Non-point Source Pollution Intensity and Ecological Non-Sensitivity Intensity—Taking Huidong Section of Trevally River Basin as an Example
Rural non-point source pollution is a hot and difficult problem in current research.Taking the Huidong section of the Trevally River basin as an example,this paper constructs a spatial coupling coordination model of rural non-point source pollution intensity and ecological non sensitivity intensity,and the rural non-point source pollution intensity,ecological non sensitivity intensity and spatial coupling coordination de-gree of each patch were calculated and analyzed.The results show that:Although 60.55％of the land in Huidong section of Trevally River ba-sin is in high-quality coupling coordination area and good coupling coordination area,11.96％of the land is still in extreme imbalance area,and the ecological and environmental problems caused by rural non-point source pollution are still very serious;The spatial distribution of hot spots and cold spots of coupling coordination degree is very obvious,the hot spot area of 99％confidence interval accounts for 56.08％,and the cold spot area of 99％confidence interval accounts for 21.21％;Aquaculture pollution is the main non-point source pollution source in rural areas in Huidong section of Trevally River basin,and it is the main factor affecting the spatial coupling coordination.It suggests that each villa-ges and towns scientifically delimit the no breeding and limited breeding areas of animal husbandry,reasonably determine the breeding scale,and promote the combination of planting and breeding and ecological breeding mode;Ecological ridge,ecological ditch and ecological pond systems shall be scientifically arranged to prevent agricultural tail water and rural domestic sewage from being directly discharged into the river without any treatment;The impact and interference of rural economic and social activities on the ecological environment,especially the rural ecological environment in ecological highly sensitive areas should be gradually reduced.
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