关键词: 喀斯特天坑, 生境, 生物入侵, 紫茎泽兰, 功能多样性, 土壤微生物

Abstract: To clarify the dynamics of fractional vegetation coverage (FVC) in Yushenfu coalmine, the spatiotemporal distribution and inter-annual changes of FVC were assessed using the pixel dichotomy model, linear regression trend and correction coefficient for topographic areas, based on the MOD13Q1 of MODIS data during 2005-2016. The relationships between FVC change and topography, land-use and land-cover change (LUCC) and mining activity were analyzed. The results showed that: (1) In the study period, FVC in Yushenfu coalmine showed drastic changes. The area with low VC was distributed in the south of Wulanmulun River and the north of Wuding River, while the area with high FVC was located in Shenfu mining and the south of Yuheng mining. (2) The inter-annual changes of FVC showed an improved trend with first descending and then raising from northeast to southwest, and areas with FVC improvement accounted for more than 90% of Yushenfu coalmine. (3) In the areas within elevation 899-1000 m, slope 8-12 degrees and plain, the mean FVC was the highest. The area ratio of vegetation improved type was the largest at the elevation 1000-1437 m, slope 4-28 degrees and hill. In addition, the overall vegetation situation of LUCC in 2010-2015 was better than that in 2005-2010, and vegetation was dominated by improved type. (4) Comparing the FVC in the ore occurrences, workshop, dumps, subsided land and buffer zone showed that mining activity had obvious influence on vegetation.

Key words: Eupatorium adenophorum, soil microbial community, biological invasion, habitat, karst tiankeng, functional diversity.