Study On Coupling Relationship Between Forest Land Change And Soil Erosion In Wuchuan County Of Inner Mongolia

Taking the Wuchuan County of Inner Mongolia as the research area,using the basic data such as distribution map,DEM,rainfall,soil type distribution map and remote sensing image of 1:5 million public welfare forest as the main data source,the space-time dynamic change of woodland in the 2000-2015 15a was analyzed by "3S" technology.The spatial and temporal changes of soil erosion in the 2000-2015 were analyzed by using the soil erosion model of RUSLE,on the basis of which the coupling relationship between woodland and soil erosion was studied by using the coupling coordination model.The results show that:1.From 2000 to 2015,the total area of forest land in Wuchuan County showed a gradual increase trend,with a total increase of 627.99km2;among them,the largest increase in 2005-2010,an increase of 295.79km2.During the study period,the area of shrub land area changed the most,and the increase accounted for 41.78%of the total growth area of forest land.Followed by Yilindi,accounting for 25.58%of the total growth area of its forest land.The forest land structure of Wuchuan County is dominated by shrub land,suitable forest land and forest land.The area of each forest land is sorted by area:Shrubbery>Yilin land>forest land>unforested land>no standing woodland>sparse forest land.From 2000 to 2015,the forestland diversity index and the equilibrium index of Wuchuan County all showed an upward trend,and the area of various forest land showed an increasing trend.The dynamic range of integrated forest land in 2000-2015 has gradually decreased,indicating that the rate of change of forest land has shown a slowdown.2.From 2000 to 2015,the average annual rainfall erosivity and rainfall erosivity of Wuchuan County showed a decreasing trend.The areas with large rainfall erosivity were concentrated in the northeastern part of Wuchuan County,and the rainfall erosivity factors in the central part were also larger.In 2015,the rainfall erosion potential of Wuchuan County gradually weakened,and the vegetation coverage showed an increasing trend.The area occupied by micro-erosion has increased to some extent between 2000 and 2015,and the area occupied by mild and above soil erosion grades has decreased.The soil erosion intensity grade from 2000 to 2015 is dominated by micro-degree and light erosion,and other soil erosion grades account for a small proportion.The distribution of strong,extremely intense and severely erosive areas is very small,mainly distributed in the tops of the southwest and south central towns and villages with low vegetation coverage.Moderately eroded areas have a small distribution area,mainly distributed in Flarahe Shaoxiang,Deshenggou Township and Daqingshan Township.The lightly eroded areas are evenly distributed in various towns and towns in the central and western regions.The slightly eroded area has the largest distribution and is evenly distributed throughout the county.3.From 2000 to 2015,the annual average maximum erosion modulus and soil erosion intensity decreased,and slight erosion and mild erosion dominated,and the area of severe erosion was less.The coupling degree and coupling development degree of forest land type and soil erosion all showed an upward trend,and the coupling was very good and the overall development was coordinated.