Landscape Pattern Evolution And Its Influence On Plant Diversity In Xilinhot Coal Power Base

In order to ascertain the evolution of the landscape pattern and its influence on plant diversity and primary productivity in the northern grassland area of my country under the background of mining mining,a large coal power base in Xilinhot was selected as the research object,and the land use/cover change and landscape pattern in this area were analyzed.The impact of dynamic changes and landscape pattern changes on major ecological indicators(species Shannon diversity index,species evenness index,species richness index,grassland primary productivity).The main conclusions are as follows:(1)In terms of vegetation composition in the study area,a total of 27 families,56 genera,and82 species of plants were recorded,and a total of 9 species of community types were recorded.(2)From 1991 to 2016,the area of grassland as the main land use type continued to decrease,the number of patches continued to increase,and patch fragmentation was significant.The area and quantity of the main artificial patch industrial and mining storage land,transportation land and residential land continue to increase,and the increase in the types of artificial patches is the main reason for the fragmentation of grass patches.(3)The mining of minerals increases the type of landscape structure composition in the study area,which reduces the connectivity of the mining area and its surrounding landscapes.Large-area patches with strong connectivity are replaced by fragmented habitats dominated by small patches.(4)In terms of the dynamics of plant community types in the study area,the vegetation area of natural grassland and low-wetland as the main dominant patch types has been decreasing,the area of artificial patches has increased significantly,and the degree of grassland shrubbery has increased.(5)In a small-scale landscape(a buffer zone with a radius of 1 km),the current species diversity distribution pattern of grassland communities has a weak correlation with the landscape pattern,while in a larger-scale landscape(a buffer zone with a radius of 2 km and 3 km),both The correlation between the community is relatively strong,and does not show a dependence on the time scale;compared with the small-scale(1 km radius buffer),the community uniformity has an impact on the landscape on a larger scale(2 km radius and 3 km buffer).The historical response is more sensitive,and there is no significant difference in the time series.(6)The primary productivity of grassland is closely related to the current surrounding landscape pattern.Fragmentation of the landscape is not conducive to the increase of primary productivity.The better the connectivity of the landscape,the better the increase of primary productivity.