Habitat Quality Assessment Of Tare Earth Ore Based On In Vest Model

Land is the carrier of various ecosystems.A series of changes in land-use have a certain impact on the quality of ecological environment,and it is the intermediate transmission performance of interaction between economic and social environment and natural ecosystem.Meanwhile,rare earth,as an indispensable resource in economic production and national defense security,plays an important role in global strategic resources.With the emergence of ecological space,habitat quality and other terms,a large number of qualitative and quantitative assessments of ecological environment quality concepts and methods are also widely used.Based on the research of literature analysis,the habitat quality assessment method based on the InVEST model can be used to evaluate the habitat quality of the towns located in the rare earth ore.The method is applied to model analysis,statistical analysis and correlation analysis,which can cover the basic land-use types and specific land-use types of the research area in a comprehensive way,and can evaluate and analyze the habitat quality of the research area.This paper takes Quannan County,which is rich in rare earth in Gannan area as an example,and the research contents and achievements are summarized as follows:(1)Analysis of the characteristics of ecological space changes for the evaluation of habitat quality.Through the delineation of ecological space,the land use types of the study area are divided into two categories: ecological space(arable land,garden land,woodland,grassland,water area,unused land)and non-ecological space(construction land).The characteristics of ecological space changes are mainly analyzed from the following three aspects: the analysis of the characteristics of the changes in the number of ecological spaces,the analysis of the characteristics of changes in the types of ecological spaces,and the analysis of the dynamics of ecological spaces.The ecological space of the study area is in the main position,of which forest land accounts for the largest proportion,followed by cultivated land,garden land,grassland and water area are at the same level,and the unused land area is the least.The change of ecological space type is mainly based on the transfer of garden land,grassland,woodland,construction land to cultivated land,and construction land transfer to woodland.(2)The parameter improvement and setting of the InVEST model.The operating basis of the InVEST model is land use data,stress factor-related parameters,and the sensitivity parameters of habitat types to stress factors.This article takes into account the geographic location and regional characteristics of the research object and combines the research results of existing related literature.In summary,the stress factors suitable for rare earth mining areas are proposed: cultivated land,villages,towns,transportation land and mining land.After the stress factors are determined,the relevant parameters are determined,and the weight of the influence of the stress factors on the habitat type is determined by the entropy weight method.(3)Habitat quality analysis and evaluation based on InVEST model.The InVEST model is used to simulate the habitat quality in the study area,and quantitatively and qualitatively analyze the quantitative and spatial characteristics of the habitat quality map and the habitat degradation map.The results of statistical data show that the high habitat quality level and the higher habitat quality level account for a large proportion in the study area.The high habitat quality areas are mostly located in the forest farms of the division boundary,and the low habitat quality areas are concentrated in the central villages and towns.Statistics on the area of the habitat quality index grade at each time point.Due to urbanization,the range of low-habitat-quality areas has increased,and the high-habitat-quality areas have decreased.At the same time,the analysis of the habitat quality changes of different land types shows that the habitat quality changes of forest land and other land types are basically within 0.01,and with plus or minus 0.3 as the critical point,the changes are divided into three categories:negative changes in habitat quality(-1?-0.3),a slight change in habitat quality(-0.3?0.3),a positive change in habitat quality(0.3?1).Comprehensive experiments have shown that the results of the analysis of habitat quality in the study area based on the InVEST model are consistent with the results of the analysis of the characteristics of ecological spatial changes in the study area.From the analysis of the characteristics of ecological spatial changes based on objectively existing land use types to the evaluation of the habitat quality model of the stress factors affected by human activities,the comprehensive evaluation of the ecological environment quality of rare earth mining areas has been carried out in coordination and perfection,and related planning policies and governance methods Provide a valuable reference basis.