Study On Ecological Carrying Capacity Loss Assessment Caused By Landslide Disasters In Mountainous Areas In Southeastern Jilin Province

Geological disasters are widely distributed in various regions,and they occur frequently and have great destructive power.Because the monitoring research on them is not thorough and cannot prevent pre-disaster prevention,suddenness is also an important feature of geological disasters.Among various types of land disasters,landslide hazards are typical and common dangers in geological disasters.Its “launch-impact-stack” movement characteristics pose great risks to people's life and property safety and natural ecological environment.Due to the unique geological environment and seasonal climate characteristics in the southeastern part of Jilin Province,geological disasters occur frequently in spring and autumn.Jilin City is located in the eastern part of Jilin Province.It is located in the Yitong-Shulan fault zone,and the landslide hazard is more serious.Therefore,this paper chooses Jilin City as the research area.Firstly,according to the geological disaster investigation record of Jilin Province,the landslide point is counted,and the landslide is finely photographed and processed by the drone shooting technology,and the high-precision drone is obtained.Based on the results of remote sensing imagery and traditional satellite remote sensing,the landslide area was extracted by multisource remote sensing technology.Based on the extraction results,the discrete element numerical model was used to simulate the landslide movement morphology,and the landslide disaster area was obtained.And by constructing a localized ecosystem service value table and combining the “pressure-state-response” model,the evaluation index system of Jilin city's ecological carrying capacity was established and its ecosystem value was evaluated.The area affected by the landslide was coupled with the assessment results,and the ecosystem loss caused by the landslide was evaluated.The vulnerability curve of “landslide area-bearing capacity loss” was established,which provided a basis for the rapid assessment of losses caused by landslides in the future.research shows:(1)UAV aerial photography technology has obtained a remote sensing image with a spatial resolution of 0.03 meters.Combined with satellite remote sensing technology and supervised classification method,it can realize the automatic extraction of landslide range,which can play a greater role in the study of geological disasters.(2)The research on the value of ecosystem services in Jilin City shows that the value of ecosystem service per unit area in Jilin City is higher than the average value in China.The ecological service value per unit area of each ecosystem is: 1,400.22 yuan for forest ecosystem,and grassland ecosystem is 5804.51 yuan,the cultivated land ecosystem is 3894.34 yuan,the water area is 22586.66 yuan,and the unused land is 636.31 yuan.(3)Jilin City “Slope Area – Bearing Capacity Loss Vulnerability Curve”,the formula is: y=393.487x^2+5421.600x+382.684(R2=0.921).Generally speaking,although the landslide disasters in the flood season in Jilin City are frequent,the impact on the ecological carrying capacity of Jilin City is small due to the small volume of the landslide,the low elevation of the slope,and the distance from the residents' gathering points.