Intergrating MSPA-MCR-landslide Susceptibility Model Into The Study Of Construction Of Ecological Security Pattern In Shuangbai County

The fast development of my country's social economy is a more or less accompanied by some ecological and environmental problems,and country's ecological security situation has become increasingly severe.Ensuring regional ecological security has become an important topic of sustainable social and economic development.Reasonable construction of an ecological security pattern can harmonize the relationship between economic development and the ecological environment,advance the rational allocation of resources,and ensure regional ecological security.To this end,this study selects Shuangbai County,Chuxiong Prefecture of Yunnan Province as the research object,using ecosystem importance evaluation and morphological pattern spatial analysis method and landslide sensitivity evaluation model including information value model,logistic regression model,maximum entropy and minimal cumulative resistance model and gravity model respectively to identify the ecological source,resistance surfaces and ecological corridors and ecological nodes respectively,and discussed ecological safety protection suggestions in Shuangbai County.The research results are of great significance for monitoring and protecting the ecological security of the study area,disaster warning and prevention,and the same time also provide reference for small-scale areas to combine their own inherent characteristics to construct ecological security pattern.The main conclusions are as follows:(1)Ecological source identification and accuracy comparison based on ecosystem importance evaluation and MSPA.The ecological source identified by MSPA cover an area of 2490 km~2,and 65%ecological red line of the study area overlaps with the ecological source,and 73%the Green Peacock spots appear on the ecological source area;while the ecological source area identified by the evaluation of the importance of ecosystems cover an area of 398 km~2,17%ecological red line overlaps with the ecological source and 13%of the Green Peacock spots appear on the ecological source area.The research results show that the ecological source based on MSPA identification is more consistent with the actual situation,and the result is more accurate.(2)Construction of resistance surface based on landslide sensitivity evaluation.The landslide sensitivity evaluation mainly uses three commonly used evaluation models such as IVM,LRM,and Max ENT.By comparing the evaluation accuracy of the three models,the basic resistance surface is corrected with the most accurate landslide sensitivity evaluation result.Among them,the evaluation accuracy of the model of IVM is 69.2%,the evaluation accuracy of the model of LRM is 82.8%,and the evaluation accuracy of the Max ENT model is 99.4%.Therefore,the landslide sensitivity result predicted by the maximum entropy model is used to modify the basic resistance surface which based on the land use/cover type.The revised high-intensity areas of resistance surface are mainly in the east,northeast and west of the study area and the areas with strong human activities.Compared with the basic resistance surface,the boundary between high and low values of the modified resistance surface is more obvious and aggregated.At the same time,there is a positive correlation between the landslide sensitivity evaluation and the resistance surface.(3)The results of constructing the ecological security pattern based on the MSPA-MCR-landslide sensitivity model.Based on MCR,a total of 136 potential corridors were obtained,which were densely distributed in the central and eastern regions of the study area.The ecological network in the eastern region was better than that in the western region,and the connectivity in the western region was poor.Among them,the important corridors are mainly concentrated in the western,northern and central regions,and cross the whole study area.In general,the ecological network in Shuangbai County is basically connected into a ring network,and patches can be connected to each other,which provides good conditions for regional ecological governance.In the future,relevant departments should strengthen the key protection of high security areas on the basis of existing protection measures to ensure their ecological security.Secondly,we should formulate relevant policies according to local conditions to alleviate the ecological and environmental problems in low and medium ecological security areas,and promote the coordinated development between economic development and environmental protection.Finally,we should pay attention to the reconstruction and ecological construction of important corridor areas,and strengthen the construction of ecological nodes,especially in the western region.