Assessment and Feature Analysis of Soil Erosion in Mountainous Area of Guangdong Province Based on USLE

Taking reasonable soil erosion factors from remote sensing and GIS spatial analysis,we estimated the soil erosion situation by universal soil loss equation(USLE)in mountain area of Guangdong Province.The spatial changes of soil erosion with laud use,soil type,slope degree and elevations also be analyzed in this paper.The results indicate that the annual average soil erosion amounted to 1.23×108 t with the mean soil erosion modulus of 1 080t/(km2·a)classified as slight degree erosion.Among different types of land use,the strongest soil erosion occurred in dry land with the erosion modulus of 2 055t/(km2·a)and the weakest erosion was in forest and grassland with the erosion modulus of 908and 932t/(km2·a)respectiely.And the soil erosion intensity increased with slope gradient,the greater of the slope gradient,the more intense of the soil erosion.In different elevation zones,the soil erosion intensity increases with the elevation until to 1 600meters,after which the erosion intensity decreased.