RS-GIS-Based Investigation And Research Into The Desertification

The phenomenon of rocky desertification not only seriously affects the social and economic development in the region,but also threatens the basic conditions for human survival in the region.Due to population growth,human activities are frequent,vegetation destruction is severe in this area,soil erosion and ecological degradation are severe.Land rocky desertification is the most important ecological problem that restricts China's economic and social development.It regularly grasps the status of rocky desertification in rocky areas,the comprehensive results of rocky desertification and dynamic changes,analyzes the causes of dynamic changes in rocky desertification,and scientifically evaluates rocky desertification.The effectiveness of prevention and control is conducive to providing reliable national and local monitoring data for rocky desertification,accelerating ecological restoration of rocky desertification land,improving regional ecological environment,improving people's living standards,and achieving sustainable development of regional economy.This paper takes Wudang District of Guiyang City as the research object,and uses high-resolution remote sensing imagery(GF-1 PMS),Landsat8 OLI image combined with GIS and GPS technology to obtain information on the area,distribution,extent and other aspects of rock desertification in 2016.According to the results of the previous rocky desertification survey,the dynamic changes of rocky desertification were mastered to provide scientific decision-making for the monitoring and control of rocky desertification.The main conclusions are:(1)The area of rocky desertification land in the study area is 10339.35 hectares,accounting for 25.88% of the karst land area in the study area;the potential rocky desertification land area is 16858.31 hectares,accounting for 42.21% of the karst land area in the study area;the non-rock desertification land area is 12747.99.Hectares,accounting for 31.91% of the karst land area of the study area.The area of light rocky desertification land in rocky desertification land is 4994.33 hectares,the area of moderate rock desertification land is 5132.76 hectares,and the area of severe rocky desertification is 212.86 hectares.There is no extremely heavy rocky desertification land in the study area.The total area of desertification land is 48.30%,49.64%,and 2.06%,of which the proportion of light and moderate rocky desertification land is relatively large,accounting for more than 90% of the total area of rocky desertification land in the study area.(2)The results of this paper show that the incidence of rocky desertification is higher than 20% on average,and the incidence of rocky desertification in the slope township is the highest,reaching 35.27%.Compared with other towns and villages,the rocky desertification situation is more prominent and should be strengthened.Governance of rocky desertification land in the township.Among the status of rocky desertification land in each township,the proportion of light and moderate rocky desertification is the largest,the proportion of heavy rocky desertification land is the smallest,and the towns with the most concentrated light and moderate rocky desertification area are Shuitian Town and Baiyi Town.Xiaba Town.(3)The area of rocky desertification land in the study area accounts for 11.71% of the total land area in the karst area,the area of potential rocky desertification increases by 8.06% of the total land area in the karst area,and the area of non-rocky desertification increases the total land area of the karst area.The overall trend of rocky desertification area in the study area is 3.63%,indicating that the rocky desertification control project has achieved certain results.(4)From the image interpretation features of the study area and the current survey of vegetation conditions,the effect of forward evolution is more obvious.The evolution types of rocky desertification land are mainly gradual evolution,the rocky desertification land area is reduced,and the potential rocky desertification land and non-rock desertification land area are increased.(5)From the area of the two different stages of rocky desertification,the degree of rocky desertification in the study area is mainly concentrated on the transition from light rocky desertification land to potential rocky desertification land,and some light and moderate rocky desertification land is in a stable state..Judging from the different areas of rocky desertification in the two towns,the evolution of rocky desertification in the study area is mainly concentrated in the middle of the study area,namely,Shuitian Town,Xiaba Town,and Xinchang Town in the north.The area of light and moderate rocky desertification land decreased,and the area of potential rocky desertification land and non-rock desertification land increased.(6)The rocky desertification status changes under the comprehensive control of rocky desertification land in Wudang area.The rocky desertification land is transformed from light and moderate rocky desertification land to potential rocky desertification and non-rocky desertification land.The rocky desertification status tends to be smooth.To evolve.