Study On Evaluation Of The Soil Erosion In The Central And South Mountainous Area Of Shandong Province

Based on remote sensing images,rainfall,soil,land use types,landforms and other data,RS and GIS techniques are used to calculate the relevant factors of the general soil erosion equation(RUSLEE)model.To analyze and evaluate the present situation of soil erosion in different regions in different regions of middle South of Shandong.Based on the data of remote sensing image,rainfall,soil,land use type,topography and geomorphology,etc.The methods of literature research,model analysis,mathematical statistics and GIS spatial analysis were used to evaluate the present situation of soil erosion in Nanshan area of central Shandong Province.In the model analysis,the RUSLE model and the watershed area-elevation integral curve which reflect the relationship between the watershed geomorphology development stage and erosion are mainly used.Combining with the elevation integral curve to calculate the geomorphological development stage and soil erosion situation in the south mountain area of central Shandong Province,the soil erosion state and soil erosion control can be analyzed more perfectly.The main work of the study is as follows:1.Calculating the soil erosion modulus by RUSLE model in middle South of ShandongBased on RS and GIS technology,calculating each factor of soil erosion model(RUSLE)by the data of rainfall,soil,DEM,remote sensing images,land use type,then superimposing and analysing R,SL,C,K,P in each factor contribution in middle South of Shandong.2.Classification of soil erosion and analysis of erosion status.Calculating the total of soil erosion in middle South of Shandong by model of soil erosion is 48.9923 million t,the average soil erosion modulus is 1010.56t/km~2·a.According to the"northern Rocky Mountain Area comprehensive soil erosion control technology standard"(SL665-2014),soil erosion intensity in middle South of Shandong divided into slight,mild,moderate,strong,extremely strong and severe erosion grade.In erosion distribution,slight erosion area is most,up to 80%;mild erosion area is next;moderate erosion is center;strong erosion,strong,extremely strong and severe erosion of total area is smaller,less than 3%of the basic region,but it is the main cause to the soil loss in middle South of Shandong.In the regional distribution of soil erosion intensity,due to large internal mountains in Nandasha river,Beidasha river,Yufu river,Balou river,Xiaofu river,Mi river,upstream of Yi river basin,Wen river and the low vegetation coverage,the soil erosion intensity and soil erosion in southern Jinan mountainous area,Taian city and Linyi area are very high.The other areas,such as Weifang,Jining,Zaozhuang and Rizhao,in the lower reaches of Weihe,Sihe,Shuhe,Xue and Yihe,have relatively weak soil erosion intensity and are weak areas of soil erosion.3.Analysis on the Countermeasure of Soil Erosion in the middle South of ShandongTo classify the soil erosion intensity grade in the mountainous area of South-central Shandong,calculating comprehensive evaluation index of soil erosion,analyzing the current situation of soil erosion in middle South of Shandong according to the landform,physiognomy evolution stage,administrative districts,basin and soil erosion evaluation,proposed the following countermeasures:Combinating with the spatial distribution pattern of soil erosion,increasing the human science and technology and capital investment;According to the difference of landform types and geomorphological evolution stages,corresponding countermeasures are put forward for different regions,such as strengthening slope land management,preventing and controlling the key areas of soil erosion,increasing protection efforts and improving ecological restoration.