Evaluation And Prediction Of Soil Erosion In Mountainous Area Of Southern Anhui Based On CSLE Model

Soil erosion is one of the most serious natural disasters in the world and the most common environmental problem faced by human beings.The mountainous area of southern Anhui province is a serious area of soil and water loss.Regular investigation of regional soil invasion and investigation of soil and water loss can provide scientific basis for comprehensive control of regional soil and water loss.In this paper,the mountainous area of southern Anhui was selected as the research area,and the soil erosion factors were extracted and analyzed by combining GIS technology and CSLE model.The soil erosion modulus was calculated and quantitatively evaluated,and the spatial-temporal changes of soil erosion in the mountainous area of southern Anhui from 2000 to 2018 were analyzed,as well as the distribution of soil erosion under different conditions.Based on soil erosion data in 2018,soil erosion in 2026 was predicted and analyzed,to provide a theoretical basis for the prevention of soil erosion measures.The main conclusions are as follows:(1)The average soil erosion modulus in the mountainous area of southern Anhui was 1370.0 t/(km2·a)in 2000,2185.5 t/(km2·a)in 2010 and 1527.2 t/(km2·a)in 2018,showing a trend of first increasing and then decreasing.From 2000 to 2010,soil erosion increased by 29.624 million tons,and soil erosion was serious.From 2010 to 2018,soil erosion decreased by 23.962 million tons,and soil erosion gradually improved.The area of slight erosion and slight erosion accounted for more than 80%in the study area from 2000 to 2018,and they were mainly slight erosion and mild erosion.(2)The spatial pattern of soil erosion intensity map showed similar trend in the mountainous area of southern Anhui.Micro erosion are mainly distributed in Wuhu,Maanshan,and declare the northern cities such as area,mild erosion distributed in the south of the mountains in the south of Anhui,moderate erosion extremely strong erosion distribution in the southwest mountainous area,severe erosion in Chizhou,Tongling city and Huangshan city surrounding area,show that mountainous area in the south of Anhui,severe soil and water loss need to intensify efforts to comprehensive treatment.(3)From 2000 to 2018,the erosion area of mild erosion or above is mainly concentrated in the altitude of 200-500m,and the altitude range of 200-500m is the key control area of soil and water loss.The range of 5～15° in the study area is the area of serious soil erosion,and the corresponding measures should be taken to control soil erosion.In the mountainous area of southern Anhui province from 2000 to 2018,the arable land area was mainly micro erosion.The forest land is mainly mild erosion.The area of intense erosion of grassland was the largest,accounting for 27.13%,47.84%and 30.97%of the total area of grassland erosion,respectively.Water,construction land and unused land are subject to micro erosion.The results showed that grassland erosion was the most serious among land use types,and grassland protection should be strengthened in the follow-up control of soil erosion.(4)Soil erosion prediction results showed that compared with 2018,moderate erosion and severe erosion area in 2026 decreased significantly,and soil erosion control effect was significant.Soil erosion control efforts should be continued,and the prediction results can provide reference for future soil erosion control in the study area.Figure[37]Table[22]Reference[81]...