Relationship Between Landuse Change And Soil Erosion In Dongzhiyuan

The Loess Plateau is one of the most serious soil erosion areas in China.Dongzhiyuan is located in the hinterland of the Loess Plateau,which is one of the largest loess tableland remaining in the Loess Plateau,facing a huge threat of soil erosion.Land use is a comprehensive reflection of all kinds of human activities,and has a great impact on soil erosion.On the basis of previous studies,we take the multitemporal remote sensing data of Dongzhiyuan from 1987 to 2016 as the source of information and make use of the current situation of land use and field investigation in Dongzhiyuan to dynamic monitorof the land use of Dongzhiyuan from 1987 to 2016.Through the DEM data,remote sensing image,rainfall data and soil data,we can extract various elements that affect soil erosion to estimatethe soil erosion modulus in the study area.This paper evaluates the study area soil erosion situation from 1987 to 2016.Based on the above research,the relationship between land use change and soil erosion in the study area is studied.The results show that:?1?Dongzhiyuan's dominant land use form is cultivated land and grassland.The largest area of cultivated land and grassland is 2483.42km²,and is 89.8%of the total area of Dongzhiyuan.The Minimum area of cultivated land and grassland is2145.87km²,and is77.59%of the total area of Dongzhiyuan.From 1987 to 2016,grassland and bare land area of Dongzhiyuan increased firstly and then decreased.Shrub grass and woodland area of Dongzhiyuan decreased first and then increased.Construction land area of Dongzhiyuan has been on the rise.Cultivated land area of Domgzhiyuan fluctuates in a certain range.?2?From 1987 to 2016,the main types of land use transfer in Dongzhiyuan were mainly:Mutual transformation between low coverage vegetation,bare land and high coverage vegetation,farmland is converted to cropland,forest and grass,vegetation is reclaimed and cultivated for arable land and the conversion of cultivated land to construction land.?3?Soil erosion in Dongzhiyuan are mainly micro erosion and slight erosion.The largest area of micro erosion and slight erosion is 2178.78km²,and is78.78%of the total area of Dongzhiyuan.The Minimum area of cultivated land and grassland is1645.42km²,and is59.5%of the total area of Dongzhiyuan.?4?From 1987 to 2016,soil erosion in Dongzhiyuan deteriorated first and then slowed down.From 1987 to 2000,the average soil erosion modulus in Dongzhiyuan Increased 63.11t·ha^-2·a^-1 and soil erosion in Dongzhiyuan deteriorated.From 2000 to2016,the average soil erosion modulus in Dongzhiyuan Increased63.11t·ha^-2·a^-1reduced62.17t·ha^-2·a^-11 and soil erosion in Dongzhiyuan slowed down.?5?The degree of soil erosion corresponding to land use in Dongzhiyuan is:bare land>grassland>Construction land>Cultivated land>Shrub grass>woodland.?6?From 1987 to 2003,the main land use change to mitigate soil erosion in Dongzhiyuan is:conversion ofLow covervegetation or bare land to high coverage vegetation and the conversion of cultivated land to irrigation grassland and woodland.From 1987 to 2003,the main land use change to aggravate soil erosion in Dongzhiyuan is:the conversion of high coverage vegetation to low coverage vegetation or bare land,the transformation of grassland and woodland to cultivated land and transformation of cultivated land to construction land.