Li Cui, Jing Ju Hui, Liu Jin Xian, Chai Bao Feng
College of Environment and Economics, Shanxi University of Finance and Economics, Taiyuan 030006, China.
Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China.
Ying Yong Sheng Tai Xue Bao. 2018 Jun;29(6):1975-1982. doi: 10.13287/j.1001-9332.201806.040.
The maintaining mechanism of community diversity is the core of community ecology. The mine tailing is a good field for studying on the underlying mechanism of community diversity, as a kind of original bare land with heavy metal pollution, where the physicochemical characteristics of soil change with the restoration periods. We examined the driving forces for bacterial community diversity based on the investigation of edaphic factors, plant community, and bacterial communities in Shibahe copper mine tailing, Shanxi. The results showed that nutrient contents in soil increased with restoration periods. The seasonal dynamics of soil nutrient in different restoration time were different. Shannon diversity and richness of bacterial community showed an increasing trend, indicating community stability was improved with restoration. Influenced by plant community, the seasonal changes of those indices differed with restoration. Results from the RDA analysis showed that the diversity and structure of bacterial communities were determined by environmental factors (edaphic, plant and heavy metals). Results from the structure equation models further confirmed that soil nutrients (TC, TN, NO-N, NO-N), plant community, and soil enzyme activities jointly drove bacterial community assembly on the copper mine tailings.
群落多样性的维持机制是群落生态学的核心。尾矿作为一种存在重金属污染的原始裸地，其土壤理化性质随恢复时间而变化，是研究群落多样性潜在机制的良好场所。我们基于对山西石坝河铜矿尾矿土壤因子、植物群落和细菌群落的调查，研究了细菌群落多样性的驱动因素。结果表明，土壤养分含量随恢复时间增加。不同恢复时间土壤养分的季节动态不同。细菌群落的香农多样性和丰富度呈增加趋势，表明群落稳定性随恢复而提高。受植物群落影响，这些指数的季节变化因恢复情况而异。冗余分析结果表明，细菌群落的多样性和结构由环境因素（土壤、植物和重金属）决定。结构方程模型结果进一步证实，土壤养分（总碳、总氮、硝态氮、铵态氮）、植物群落和土壤酶活性共同驱动了铜矿尾矿上细菌群落的组装。
