Study On Key Factors Of Regional Soil Erosion Model

China is one of the countries with the most serious soil erosion in the world.For more than a century,scholars at home and abroad have been exploring the law of soil erosion,and have made good progress in micro-scale,such as district,slope and watershed.However,the research on regional scale is still in the exploratory stage.In this paper,the impact of regional soil erosion is significant.Rainfall,soil,slope,runoff path and surface cover,which are easily accessible by current technology,are the key factors of regional soil erosion model.Referring to the ideas and advantages of statistical empirical model,the spatial model of soil erosion was established by using spatial information technology Meanwhile,the meanings of the factors in the model are agreed and the corresponding parameterization methods are proposed.On this basis,the model was used to estimate the soil erosion modulus of Chaobai River Basin in Beijing in 2017.Finally,the feasibility of the model is analyzed by comparing the estimation results of the spatial model of soi1 erosion with those of RUSLE.The main conclusions are as follows:(1)The key factors selected in this paper,such as rainfall erosivity,soil erodibility,slope,runoff path and surface coverage,can generally reflect the impact of natural and man-made disturbances on the spatial pattern of soil erosion.(2)The parameterization method of key factors proposed in this paper is reliable and can reflect the impact of each factor on regional soil erosion quickly and quantitatively.The interpolation method proposed by GPM satellite data and Jin Qiutong has high accuracy in estimating rainfall erosivity,and the runoff path factor can accurately reflect the actual topographic erosion situation and the potential of erosion.The index can better reflect the actual vegetation cover and effectively describe the impact of vegetation on soil erosion under different quality and vertical structure(3)Unifying the data of each factor with a resolution of 30m can meet the needs of dynamic monitoring of regional soil erosion in China.The spatial model of soil erosion has the advantages of simple structure,convenient data acquisition,low cost and high parametric processing efficiency.It can effectively shorten the monitoring time of regional soil erosion and reduce costs.(4)There are unreasonable land use in Chaobai River Basin of Beijing,and the land use pattern of sloping farmland is the serious cause of soil erosion.In addition,the deterioration of forest and grassland quality is the main cause of soil erosion.Therefore,the protection of natural forests should be continued in this region,the closure of mountains should be strengthened,and the natural restoration ability of mountain environment should be brought into full play.At the same time,on the basis of continuing to pay attention to the prevention and control of soil erosion in sloping farlland,we should strengthen the supervision of soil erosion in inefficient plantations with low coverage and incomplete vertical structure and unmanaged grasslands at the initial stage of conversion and after abandonment.