Spatio-temporal Coupling Relationship Between Soil Erosion And LUCC In Duolun County,Inner Mongolia

Based on the "3S" and combined with the remote sensing data,topography,rainfall,soil types and the other basic data of Duolun County.We analyze the LUCC and changes of soil erosion during 2004-2014 by using the RUSLE model and Standards for Classification and Gradation of Soil Erosion(SL190-2007).On the.basis of the present research,the study shows the spatio-temporal coupling relationship between soil erosion and LUCC and finally the suggestions on controlling the soil erosion were put forward.The result shows that:1.Land Use/Cover Change has been changed obviously in Duolun County from 2004 to 2014,therein forest land increased dramatically by 907.40km2 in the past ten years,and unused land has been reduced significantly by 470.23km2 in total.At the beginning of the study,the main land types of land use structure were grassland,unused land and farmland,whereas grassland,forestland and farmland are dominant in the end of the study,it should be noted that grassland is top priority and accounted for 48 percent in 2004,2009 and 2014.The spatial distribution of construction land is obviously concentrated,but water areas and unused land have the tendency of decreasing concentration in the past ten years.In addition,the Gini coefficient values of farmland,forest land and grassland were less than 0.4,which indicated that these three types of landuse have the homogenous and stable spatial distribution.2.1n ten years,soil erosion in study area was getting better year after year.The area of water erosion has decreased by 354.85 km,the total erosion amount has reduced by 10.25×104t,the intensity of water erosion was minor and mild,and the area of minor erosion in 2004,2009 and 2014 made up 39%,41.46%and 43.25%respectively.The area of regional wind erosion was declined from 1577.52km2 in 2004 to 1033.41km2 in 2014,and the total reduction was 544.11 km2,the erosion intensity was from the above medium level to moderate level,which pointed out the regional wind erosion is improved gradually.3.Soil erosion always occurs among farmland,forestland,grassland and unused land in Duolun County.The area of water erosion and wind erosion on grassland were maximal,while the intensity of water erosion is minor and slight,the wind erosion was moderate.In the beginning of study,the water erosion and wind erosion of unused land have decreased from 442.09km2 and 461.47km2 in 2004 to 2.42km2 and 5.19km2 in 2014.Furthermore,the erosion intensity is showed as following:the water erosion turned from distinct,extremely distinct to minor and slight,whereas the wind erosion was obvious all the time.On the other hand,the erosion area of farmland is relatively larger,meanwhile,the intensity of the water erosion and wind erosion was apparent in different periods.The erosion intensity of forestland is minor and slight in ten years.4.Soil erosion mainly occur on farmland and grassland,farmland should take into consideration the comprehensive prevention of water and wind erosion.And grassland should be take into account wind erosion prevention,the former takes the following measures:steep slope farmland,slope terracing.and no tillage and stubble no tillage,the latter should take the measures from the perspective of the vegetation cover,including the "enclosure" and "the prohibition of grazing",artificial grass etc.