| Taking Qingshuihe County of Inner Mongolia as the research area,with the support of"3S"technology,using the basic data such as remote sensing image,DEM,rainfall,soil type distribution map as the main data source,analyze the spatial and temporal pattern of forest land from 1995 to 2015;and use RUSLE The soil erosion model analyzes the spatial and temporal changes of soil erosion between 1995 and 2015;the coupled model is used to couple the relationship between forest land type and soil erosion.The results show:(1)From 1995 to 2015,the area of forest land,shrub forest,sparse forest land and other forest land in Qingshuihe County increased year by year.The area of each forest land type was from large to small,shrub forest>forest land>sparse forest land>other woodland The dynamic degree of single forest land in 2010-2015 period was faster than that in 2005-2010.The change rate of comprehensive forestland dynamics in Qingshuihe County from 1995 to 2005 was 11.51%,and the comprehensive forest dynamic degree between 2005 and 2015 was 1.83%.It indicates that the vegetation type of forest land changed rapidly in the early stage of the study period,and the rate of change in the later stage of the study period was slower.The total area of forest land transfer accounts for 20.18%of the study area,and the largest transfer area is non-forest land.The largest transfer area is also transferred from non-forest land.The northern part of Qingshuihe County has the largest area of Beibao Township and Liquhuang Village,followed by Chengguan Town in the middle,and the southwestern Yaogou Township has the smallest forest area.(2)During 1995-2015,the soil erosion intensity of forest land in Qingshuihe County was in a state of mild erosion.The area without erosion increased,and increased by 369.76km2 in 20a.At the beginning of the study,the soil erosion intensity level of Qingshuihe County was mainly moderate erosion,accounting for 46.88%of the total erosion surface.From 2005 to 2015,the erosion intensity of forest land was mainly dominated by light erosion,indicating that the overall situation of soil erosion in Qingshui County was better.In 1995,the soil erosion intensity grade was mainly moderate erosion.In 2015,the forest erosion intensity was mainly dominated by mild erosion,which indicated that the overall situation of soil erosion in Qingshui County was better.Most of the mild,moderate and intensity erosions are concentrated in most areas of Liquorzhuang,Beipu and Shantaizi Townships south of Qingshui River;most of the severe erosion is concentrated in the hilly and gully areas of Yaogou Township.The proportion of light erosion and severe erosion is the highest,indicating that the trend of soil hydraulic erosion intensity decreases.(3)in 1995-2015,due to the increasing area of forest land,the increase in non-erodible area was the largest.All kinds of forest land are mainly lightly eroded,and the intensity of erosion of shrub forest is relatively large,but the intensity erosion,extremely strong erosion and extremely strong erosion area of forest land show less trend.The comprehensive index of forestland structure in Qingshuihe County showed an upward trend,while the comprehensive evaluation index of soil erosion showed a decreasing trend.The coupling degree and coupling development degree of forestland dynamics and soil erosion are both on the rise,the coupling is getting better and better,and the overall development is coordinated. |
PDF Full Text Request