Coal Mining: Impact on Vegetation Variation in Watershed in Loess Plateau ——A Case for Changhe Basin in Jincheng

doi:10.11924/j.issn.1000-6850.casb16110017

Abstract

Abstract: The study aims to analyze the dynamic variation characteristics of vegetation under mining disturbance in Changhe Basin combining with RS and GIS, so as to provide some references for the restoration and protection of 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 recent 30 years. The results showed that: (1) the vegetation stability of Changhe Basin in recent 30 years gradually increased from the eastern and western 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, 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- high- value agglomeration showed a significant dynamic increase from 1987 to 2015, and the increase of low-low-value agglomeration was not obvious. The results show that the vegetation in Changhe Basin has significant variance in change trend and spatial distribution, and the study can provide a foundation for improving the theoretical system of vegetation dynamic monitoring in small watershed.

CLC Number:

Q948

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