| Coal mining promoted the regional economy but also caused pressure to ecological environment,which was presented by vegetation.Nowadays,remote sensing technology has became an important method to monitor vegetation cover change.To analyze the dynamic variation characteristics of vegetation under mining disturbance in the Changhe Basin combining with RS and GIS,so as to provide some reference for the restoration and protection of the ecological environment.Based on multi TM images from 1987 to 2015,the dichotomous model was used to estimate vegetation coverage of Changhe Basin and the MAC method and stability analysis were adopted to analyze the spatial and temporal variation characteristics of vegetation coverage in the last 30 years.The results showed that:(1)the vegetation stability of Changhe Basin in the last 30 years was gradually increased from the east and west part to the central part and the general stability was high,but the vegetation stability of mining area was low;(2)the vegetation of Changhe Basin had a general degradation trend in the last 30 years,59.9%of the vegetation had a tendency to degenerate;after 2007,the vegetation condition of the study area was slightly improved,of which vegetation degradation area was 1.9%less than before;(3)the vegetation coverage of Changhe Basin had a significant spatial agglomeration and similar vegetation coverage values formed 4 major clustering features.The vegetation in region of high-to-high-value agglomeration showed a significant dynamic increase from 1987 to 2015,and the increase of low-low concentration clustering was not obvious.(4)The high vegetation zone was destribute in the western mining area,while the low vegetation zone was located in the eastern non-mining area.The result shows that the vegetation in the Changhe Basin has significant variance in the change trend and spatial distribution,which is the foundation for improving the theoretical system of vegetation dynamic monitoring in small watershed. |
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