Ecological Sensitivity Analysis In The Urban Ring Forest Belt Of Guiyang Based On GIS Technology

Urban vegetation is one of the most important factors of a city's ecological construction,which is Referred to "air purifier".Guiyang ring forest belt always impacts Guiyang ecological environment in a large degree,with the large speeding of urbanization,part of the forest belt has been damaged.Ecological sensitivity evaluation can reflect the possibility of destruction about the ecological environment in a objective and scientific way.If the ecological sensitivity level and scope can be divided reasonably,it will supply the scientific basis on determining the priority of forest ecological construction,protection and restoration,which also can apply the orientation to ring forest belt's function.This thesis Based on the previous studies,a set of indicator system was established from both natural and human perspectives to analyze the ecological environmental sensitivity of Guiyang's urban ring forest belt.And all indicators were extracted and analyzed by advanced RS and GIS technology.Ecological sensitivity of the urban ring forest belt of Guiyang was comprehensively analyzed by the combination of the traditional ecological sensitivity evaluation method and Space weighted superposition technique of GIS based on Analytic Hierarchy Process.Lastly,According to the evaluation results and the main ecological environment problems above every sensitive area,the management and protection countermeasures which can provide a scientific basis to prevent and govern the forest ecological environment problems are putted forward.In the following paper,the main research results will be mentioned:(1)This research has obtained the precise DEM data model by using ArcGIS three-dimensional instrument.And a sensitivity evaluation database has been established in GIS to storage attribute data and spatial data with a unified format and coordinate.(2)The forest vegetation coverage of Guiyang ring forest belt can be calculated by using the ENV,the results show that vegetation coverage more than 75% accounts for 12.5%,60%-75% accounts for 12%,45%-60% accounts for 34.4%,30%-45% accounts for 31.5%,less than35% is of 9.6%.(3)Based on the existing ecological environment problems of Guiyang ring forest belt,the geological environment,geological disasters,hydrological conditions,the ecological environment and human activities are selected as the primary evaluation factors.The weight of each evaluation factor has been calculated by using the analytic hierarchy process(AHP),the weight of the geological environmental factors is 0.212,geological disaster is 0.069,hydrological conditions is 0.119,the ecological environment is 0.212,and human activity is 0.387.(4)Single factor sensitivity classification map can be made by using GIS,the comprehensive partition graph of Guiyang ring forest belt would be created by space weighted technology with the weight of every single factor's layer.The research results show that the insensitive area accounts for only 0.52%,mild sensitive area accounted for 30.27%,moderate sensitive area accounted for 56.23%,highly sensitive area accounted for 12.95%,extremely sensitive area accounted for 0.03%.(5)According to susceptibility zoning maps which is obtained by synthetically evaluated,some specific planning and protection measures have been putted forward corresponding to the five different levels of the forest belt.