| West Tianshan region of Xinjiang is extremely rich in natural resources and there are a large area of wild fruit tree genetic resources which are relatively rare in Central Asia and even in the world.However,due to the influence of precipitation,snowmelt and human activities,the occurrence of landslides,collapses and ice and snow freezing in the wild fruit forest area of West Tianshan Mountain in Xinjiang is frequent,which poses a serious threat to the production and life of local residents and the social and economic development.At the same time,the wild fruit forest ecosystem also suffered severe damage.the study on the ecological risk distribution pattern of natural disasters is of great significance in reducing the loss of wild fruit forest caused by natural disasters,protecting the ecological environment and promoting the economic and social development of wild fruit forest in western Tianshan Mountains.In this study,the Mohe watershed of wild fruit forest in the western Tianshan Mountains was selected as the study area,based on multi-source remote sensing data and field measured data.using RS and GIS technology,the ecological risk assessment model of landslide disaster is constructed from three dimensions: danger of landslide disaster,fragility of ecosystem and potential loss of ecosystem,to study the ecological risk assessment of mountain landslide disasters in the Da Mohe watershed in the wild fruit forest area.this paper studies the ecological risk assessment of landslide disaster in wild fruit forest region of Mohe River basin.According to the historical statistical data of landslide disaster in the study area,in combination with field investigations.in this paper,the disaster-inducing environment,meteorological conditions and human activities of landslide are studied.Slope,aspect,elevation,plane curvature,section curvature,distance from road,DNVI,annual precipitation and lithology were selected to evaluate the risk of landslide in wild fruit forest region.the remote sensing image of the study area in 2020 is used as the data source,the eight landscape types of wild fruit forest(wild apple,wild apricot,wild hawthorn),other forest land(conifer forest,broad-leaved forest,mixed conifer and broad-leaved forest),grassland,cultivated land,water area,road,residential building land,landslide,etc.ecological frangibility was characterized by landscape pattern index.evaluation of habitat quality in 2020 wild fruit forest region using In VEST model,The threat degree of threat sources to biodiversity was calculated by land cover map,And the potential ecological loss was measured by habitat quality.On the basis of the above analysis and research,a three-dimensional evaluation model of“Danger-vulnerability-potential loss” is constructed,to assess the ecological risk of landslide hazards in wild fruit forest region,It provides valuable reference for the conservation of wild fruit forest resources,at the same time,it provides a new analytical method for regional ecological risk assessment under the stress of landslide disaster.The main conclusions of this study are as follows:(1)Through field survey and multi-source remote sensing image interpretation results data,the plane morphological characteristics of the landslide in wild fruit forest region of the West Tian shan Mountains can be divided into: Circle chair,Dustpan,semicircle and compound,the profiles are mainly linear,concave,convex and trapezoidal.according to the density map of landslide spatial distribution,from 1980 to 2020,the kernel density of landslide sites in wild fruit forest area gradually increased,the maximum value was 1.48/km2,1.53/km2 and 4.06/km2,respectively.The distribution of kernel density was basically consistent with that of landslide sites.(2)From 1980 to 2020,the ecological risk of landslide disaster of wild fruit forest Mountain in West Tian shan mountain showed an aggravating trend.In terms of time,in 1980,the ecosystem was relatively stable,the overall ecological risk level was relatively low,and the regional ecological risk level of historical landslide was high,and the ecosystem stability was poor.from 1980 to 2000,the ecological risk level in the northern part of the wild fruit forest area changed from medium risk to high risk.as the northern part of the country is plain and flat.In addition to the rapid economic development,the material needs of local residents have increased,a lot of arable land has been cultivated,causing increased ecological risk.in 2020,the area of high ecological risk grades along the rivers in the central part of the study area increased significantly,in recent years,the wild fruit forest area has been seriously disturbed by human activities,human engineering activities are frequent in the region,road construction along the road led to the soil on both sides of the loose,and the precipitation will increase,so the risk sources will increase.(3)The area proportion of low-risk and low-risk areas in the study area showed a decreasing trend from 1980 to 2020.The medium ecological risk areas are mainly distributed in the areas along rivers and the areas with relatively concentrated population in the northern region.Due to the relatively flat terrain,little fluctuation,dense personnel,relatively more economic activities and a large number of risk receptors in this part,the medium ecological risk areas are mainly distributed in the areas with relatively concentrated population.The areas with high ecological risk and high ecological risk were mainly concentrated in the valley areas along rivers and the areas inhabited by people,and the area proportion showed an upward trend.the overall ecological risk trend of wild fruit forest is on the rise.Because wild fruit forest is mainly distributed in mountainous areas with high terrain,large slope and heavy rainfall in flood season,it is easy to lead to geological disasters such as loose soil and landslides in mountains.Along the river in the middle of the study area,traffic trunk lines are dense,and there are a large number of risk disaster bodies. |
