Ecological Security Early Warning Research In Karst Mountainous Areas Facing Different Scenarios

The construction of ecological civilization is conducive to the present and benefiting the future.Building an ecological civilization is the millennium of the sustainable development of the Chinese nation.With the rapid development of the social economy,the situation of global ecological environment is becoming more severe.More and more scholars have begun to study ecological security warning from different angles.This paper takes Guanling County,a typical karst mountainous area in Guizhou Province,as the research area,and selects Guanling County ecological security early warning indicator system from three aspects: water environment safety,land environmental safety and biodiversity safety.Through the 3S technology,through the processing of remote sensing images and other socio-economic data of DEM,2000,2005,2010 and 2016 in Guanling County,the elevation,slope,land use type,vegetation type and vegetation of Guanling County were obtained.Coverage,soil erosion,rocky desertification,and other relevant data were used as indicators for ecological safety assessment in Guanling County.The minimum cumulative resistance model was used to evaluate the ecological security alarms,and the ecological security alarms at different time and space scales in Guanling Countywere obtained.Evolution trend.From the results of the study,in Guanling County,the ecological security alarm area in 2000 accounted for 20.65%,the light police area accounted for 29.23%,the middle police area accounted for 25.42%,the heavy police area accounted for 14.70%,and the large police area accounted for 4.67%;In 2005,no police area accounted for 20.41%,light police area accounted for 29.53%,middle police area accounted for 25.72%,heavy police area accounted for 16.96%,and large police area accounted for 7.55%;in 2010,no police area accounted for 19.59%,and light police area accounted for 27.55%,the middle police area accounted for 25.17%,the heavy police area accounted for 18.29%,the large police area accounted for 9.39%;to the end of the study,the police-free area accounted for 18.88%,the light police area accounted for 27.31%,the middle police area accounted for 25.58%,the police The area accounted for 18.52% and the large police area accounted for 9.71%.According to the research results,Guanling County is the most serious year for ecological and environmental security in 2016.It is mainly reflected in the large increase in the area of the giant police in the main urban area.This is due to the rapid development of urbanization and the expansion of the main urban area.It has a great impact on the ecological environment of Guanling County,and the recovery rate of Guanling ecological environment is lower than the speed of urbanization development.Facing the status quo of ecological environment problems in Guanling County,based on the scenario analysis method,the ecological security under different scenarios in Guanling County was simulated by setting up water resources protection and control scenarios,cultivated land protection and control scenarios and biodiversity conservation and control scenarios.The distribution of police conditions in Guanling County under the scenario.Under the water resources protection and control situation,the unarmed area in Guanling County accounted for 19.32%;the light police area accounted for 27.94%;the middle police area accounted for 26.37%;the heavy police area accounted for 17.93% and the large police area accounted for 8.44%.The ecological security situationunder the control situation of cultivated land protection accounted for 18.92% of the area without police;the area of light police accounted for 30.97%;the area of the middle police accounted for 27.88%;the area of the middle police accounted for 15.39%;the area of heavy police accounted for 6.84%.Under the scenario of biodiversity conservation and control,the unarmed area in Guanling County accounted for 24.07%;the light police area accounted for 36.82%;the middle police area accounted for 22.75%;the heavy police area accounted for 11.45%;the large police area accounted for 4.90%.The most obvious effect under the three regulatory scenarios is scenario three,the biodiversity conservation regulation scenario.Finally,according to the actual situation of Guanling County and the early warning results set by the situation,specific control measures and strategies are proposed,including controlling sewage discharge,rationally developing water resources,rationally planning land resources,increasing water and soil conservation and rock desertification control inputs,and improving biodiversity.Sexual protection level etc.Because the study area belongs to the typical karst mountain environment,its own ecological environment system is relatively fragile,and the area is greatly affected by human activities.The soil layer is thin,the vegetation coverage is low,the soil erosion is obvious,the rock desertification is prominent,and the ecosystem restoration ability.It is weak,and its ecological security research can provide a scientific basis for the ecological environment management and government decision-making in Guanling County.This paper mainly chooses the minimum cumulative resistance model,which is less applied in ecological security early warning.Enriching ecological security early warning research methods,so this paper has certain innovation in the selection and methods of research areas,and its research results are very important for ecological security early warning research.