Spatial Heterogeneity Analysis Of Vegetation Dynamics And Driving Factors Of Resource-based Cities In Arid Regions Of Northwest China

The ecological destruction of mining industry development in resource-based cities is becoming more and more serious.Vegetation change is an important indicator of regional ecological environment changes.The coupling analysis of mining development and vegetation change is an important manifestation of regional human-land relationship research.The recognition of the spatial effect of mining development on vegetation change can be identified as Provide a basis and reference for land and space ecological restoration,land use planning and regional sustainable development.In this paper,the resource-based city Wuhai and its surrounding areas are used as research areas.In view of the expanding mining development process,the remote sensing images and multi-period land use data in the 72-story growth period from 1999to 2018 are used as data sources.Through trend analysis and geography Methods such as weighted regression model,analyze the vegetation dynamics at different periods,and identify the spatial heterogeneity of elevation and mining development affecting vegetation changes.The main conclusions obtained in this article are as follows:(1)The analysis of land use change and morphological spatial pattern in the study area shows that between 1999 and 2018,mining land is mainly divided into industrial sites,open mining sites and dumping/gangue fields.The expansion is very obvious,with an area of 69.03km~2.Increasing to 705.27km~2,the clusters are distributed in the west and south of the study area.The structural connectivity of mining land has been significantly strengthened,and the connectivity pattern of land destroyed by coal development has quickly become prominent.(2)Long-term remote sensing monitoring shows that the regional vegetation has experienced a trend of increasing first and then decreasing,with a decrease of more than 40%.The ability of mining development to affect regional vegetation is gradually increasing,weakening the positive effect of human ecological management and climatic conditions on vegetation improvement,and is the main factor for 86%(3304km~2)vegetation degradation in the region.Vegetation changes have significant spatial differences.Artificial ecological management and protection is an important factor to promote vegetation growth.The degree of vegetation improvement and fluctuation is closely related to the level of artificial management and protection.(3)Geographically weighted regression results show that there are significant spatial differences in the impact of mining development on vegetation.With the deepening of mining development,the ability of a single mine to affect regional vegetation is gradually reduced.The key action areas are concentrated around the mining area,and the distance threshold is generally 6-8km.The accumulation effect of the multi-mine area is obvious,and the vegetation change in the affected area is more significant.The key area is concentrated in the center of the multi-mine area in the west,with an area of 461km~2,accounting for 15%of the area of the study area.(4)The spatial relationship between elevation and vegetation change shows that the elevation affects vegetation change in different spaces.Taking the average elevation of mining land as the boundary,above the average elevation,the vegetation degradation worsens as the altitude rises,and below the average altitude,the lower the altitude,the more severe the vegetation degradation,and the correlation level boundary line and contour line distribution are more consistent.