Remote Sensing Analysis Of Grassland Rock Desertification And Grassland Degradation In Guizhou Province

Grassland is an important part of the ecosystem.It accurately grasps the spatial distribution,rocky desertification and degradation of grassland resources in Guizhou Province.It is a stable and perfect grassland contracting management system,strictly implementing the grassland grazing ban,animal husbandry and grassland and animal husbandry balance system,and strengthening basic grassland.Protection,an important basis for scientific management of grassland resources.At present,the research on grassland is mainly concentrated in the northern region,while the hydrothermal conditions in the southern region are better,the grassland species are diversified,the land types are more complex,the distribution is scattered,and the forest shrubs are mixed and grown.Guizhou is a key area for rocky desertification and has a fragile ecological environment.It is the province with the largest area of Using the field grass sample survey and the Landsat8 remote sensing image with 30 m resolution from July to September,the standard monitoring method for remote sensing monitoring of grassland desertification in karst area and the grading index of natural grassland degradation,desertification and salinization were adopted.Rocky desertification and grassland degradation in Guizhou;spatial relationship analysis of grassland desertification and grassland degradation through spatial autocorrelation;driving force analysis of three major factors: natural background,ecological environment and human activities,and study of Guizhou by means of dimensionality reduction The main driving force for grassland desertification and grassland degradation in the province.(1)the grassland in guizhou is mainly distributed in the south of guizhou.The area of the grassland in southeast guizhou and south guizhou is the largest,accounting for 40.22% and 64.23% of the grassland in guizhou.The area of the grassland in central guizhou in the north guizhou is the smallest,accounting for 20.34% of the grassland in guizhou.Rocky desertification of grassland in guizhou province accounts for 7.07% of the grassland area of the whole province,and grassland degradation accounts for 15.39% of the grassland area of the whole province.There is no serious rocky desertification of grassland in guizhou,and rocky desertification and grassland degradation are mainly distributed in northern guizhou,western guizhou and southwestern guizhou.(2)The autocorrelation analysis of grassland rocky desertification and grassland degradation index was carried out.With the increase of spatial threshold distance,the Moran I index of grassland desertification and grassland degradation showed a logarithmic function law,and the rate of decline of Liupanshui was fast.The distribution of grassland desertification and grassland degradation is more diversified.With the increase of distance,the spatial coupling is not significant.Most of the southeastern Guizhou Province belongs to non-karst areas,and the decline rate is relatively stable,indicating that the grassland is desertified in this area.Grassland degradation is relatively uniform,and as space increases,spatial coupling declines slowly.Through LISA clustering analysis,it is concluded that the grassland rocky desertification and grassland degradation HH aggregation patterns are mainly reflected in the northeastern Yunnan,western Yunnan and southwestern Yunnan regions,reflecting the main occurrence areas of grassland rocky desertification and grassland degradation.The LL aggregation model is mainly reflected in The southeastern and southern Fujian regions reflect areas with good grassland quality.(3)in the further study of the grassland desertification and grassland degradation based on the driving force,the guizhou lithology,altitude,elevation,gradient,slope direction,soil layer thickness,the annual average temperature,annual average rainfall,vegetation coverage,breeding stock,Overload rate and arable land accounted for a total of 11 driving force index,index system of driving force to build strength,different driving force factor reflects the different characteristics of grassland desertification and grassland degradation index.Based on the principal component analysis of GIS,the driving factors of rocky desertification and grassland degradation in guizhou province were calculated as lithology,slope direction,annual average rainfall,soil thickness and vegetation coverage.