Study On The Influence Of Residential Areas On The Spatial Distribution Of Sloping Farmland And Soil Erosio

Qingzhen City is located in the center of the karst karst area in southwest China,with a high degree of rock desertification,fragile habitat conditions,soil erosion is the primary ecological problem in the region,in 2008 Qingzhen City was listed in the country’s 100 pilot counties(cities)for comprehensive treatment of rocky desertification,and in 2011 it was listed as a key county for comprehensive treatment of rocky desertification in China,and in recent years,the rapid urbanization of Qingzhen City has greatly adjusted the type of land use,which inevitably brings great pressure to the fragile ecological environment.Under the influence of restoration and development,the relationship between people and land in Qingzhen City and the impact of humans on soil erosion deserve in-depth study.Therefore,this paper uses Arc GIS platform to extract thematic maps of settlements and slope cultivated land in Qingzhen City,calculates soil erosion in Qingzhen City using RUSLE model,uses grid analysis technology to reveal the spatial configuration relationship between settlements and cultivated land,spatial configuration relationship between settlement and soil erosion,and analyzes the correlation between settlement-cultivated land coupling mode and soil erosion by using GIS platform,in order to provide a theoretical basis for the coordinated development of new urbanization and soil erosion control in karst areas.The main conclusions of the study are as follows:(1)The total area of the study area is 138300.37hm~2,and the total sloping land area of the area is 44436.81 hm~2,accounting for 32.13%of the study area and is the second land in the study area with the trend of distribution area of forest and mild erosion accounts for 85.83%of the study area.(2)The influence of the distribution of sloping land is limited by distance,the maximum influence of sloping land spatial distribution within 200m,when the buffer distance of 200m,sloping farmland distribution area is the largest,the number of patches,after more than 200 m,the influence of sloping farmland distribution gradually reduced,and as the farming distance increases,the distribution of sloping land is more and more fragmented and scattered.(3)The distribution of residential areas and sloping land presents a positive spatial correlation."High and high cluster"is mainly distributed in Liuxiang Township,Weicheng Town,Wangzhuang Township,Xindian Town;"low and low cluster"is mostly distributed in Libo Town,Meg Township,undercurrent Town and other towns,it is mainly distributed in Hongfeng Lake Town,Chaofeng Street,Binhu Street,Qinglongshan Street,and both settlements and sloping farmland show convergence in spatial distribution,including"more north,less south,more west and less east".(4)Also,at the buffer distance of 200m,the settlement has the greatest impact on the area of soil erosion distribution and the number of patches.After exceeding 200m,the area of soil erosion distribution and the number of patches gradually decrease.(5)The distribution area of residential land is significantly correlated with the distribution area of soil erosion at 0.01(2.01)(positive correlation).At the same time,the soil erosion,the greater the soil erosion.85.06%of the total sloping area,followed by 11.49%of the total sloping area in the study area,or 3.45%of the total.