The Evaluation And Dynamic Analysis Of Rock Desertification Sensitivity In Nanming District,Guiyang City

Located in central part of Guizhou Province,Nanming District,Guiyang is the political,economic,cultural,technological and educational center of Guizhou Province,one of the first top 10 economic counties.Due to its special geographical location and historical reasons,rock desertification has become the most prominent contradiction and problem in the construction of ecological environment in this region,which has brought great harm to the local economic development.The rock desertification sensitivities is a probability of rock desertification under the natural conditions.Research on the sensitivity and the dynamic change of rock desertification is a prospective study to prevent and control it.This paper combine and classify the status quo,rock desertification sensitivity and dynamic change which provides theoretical foundation to prevent and control it.Main research contents and results:(1)This research on rocky desertification is conducted in urban and its surrounding areas outside the "traditional,small,remote,mountainous,and poor"areas.Through setting a determination criteria of non-rocky desertification areas,the research is more accurate,thus preventing urban and non Karst areas from disrupting the sensitivity evaluation.According to the research data,the total area of non-rocky desertification in 2016 reaches 8872.9 hm2,an increase of 2356 hm2 compared with that in 2011,which is a a progress out of the rapid urbanization.(2)From the three aspects of indicator detection,data preprocessing and weight calculation,the previous evaluation system for rock desertification was optimized,especially for data preprocessing,and the method is reversing from the weight calculation method,rasterizing the local survey data and transforming it into point data and exporting to eliminate the impact of area on the weight calculation results;(3)In 2016,the area of stone desertification monitoring zone in nanming district was 19680.3hm2,and the monitoring data of stone desertification was calculated through the evaluation system,and the sensitivity distribution map of stone desertification was obtained,including 2792.9hm2 insensitive areas,6047.9hm2 midly sensitive areas,1767.1hm2 moderately sensitive areas,179.3hm2 highly sensitive areas,20.2hm2 extremely sensitive areas,8872.9 hm2 areas without rock desertification;(4)Adjust the dynamic analysis of rock desertification sensitivity from change-in-level to index movement,and divide into apparent reduction,slight reduction,moderate,slight increase apparent increase according to the scale of data change.Under the condition of not triggering the areas without rock desertification,the trend of rock desertification sensitivity in Nanming District goes worse,as the sum of the apparent increase areas and apparent areas are 1056.6hm2 more than the two reduction types;(5)Combing the change types of rock desertification sensitivity,index of rock desertification sensitivity with statue quo of rock desertification,the prevention work of rock desertification in Nanming District is divided into restricted level(including 1723.0hm2 areas),supervised level(including 7408.8hm2 areas)and preventive level(including 1675.6hm2 areas),and each level has its constructive suggestion;...