关键词: 林窗, 云杉, 土壤有机碳, 土壤微生物生物量碳, 米亚罗林区

Abstract: A sampling plot investigation was conducted on the plant resources in the Xiangtan manganese mine area of Hunan Province. In the study area, the plant resources were abundant, with 53 species belonging to 28 families. Most of the plant species were wild, and a few were cultivated. The majority of the plants were perennial,and the fewer were annual. Most plants were shrub and grass,and a few were tree. These results indicated that the current local communities were dominated by perennial shrub and grass, which were at the primary stage of succession towards subtropical evergreen broadleaved forest after the original plants were completely damaged by digging exploitation. The analysis on the Mn enrichment by the plant species showed that there was a significant difference in the Mn concentration between roots and stems or leaves. Most plant species had higher Mn concentration in their underground parts than in their aboveground parts, and only a few was in adverse. Moreover, different plant species had significant differences in their capability of enriching Mn. The Mn concentrations in Cyperus rotundus aboveground and underground parts were higher than 10000 mg·kg^-1(the critical concentration for hyperaccumulators), and the biological concentration factor (BCF) and translocation factor (TF) were larger than 1 (the assessment criteria of hyperaccumulators), indicating that C. rotundus had a super capability in enriching Mn. It was also found that the biomass of C. rotundus in medium and high Mn mine areas was 507.06 g·m^-2, which met the requirement of hyperaccumulators, i.e., hyperaccumulator should have high biomass, and suggested that C. rotundus could be the first selection of hyperaccumulator for the ecological restoration of moderately and highly Mn-polluted areas.

Key words: forest gap, Picea asperata, soil organic carbon, soil microbial biomass carbon, Miyaluo fore starea.