植物群落对铜尾矿废弃地土壤微生物量和酶活性的影响

以铜尾矿废弃地为对象,研究了铜尾矿废弃地上植物群落发展与表层尾矿微生物量C、N和脱氢酶、过氧化氢碱性磷酸酶和脲酶活性的变化,探讨了植物群落-微生物量C、N_土壤酶活性之间的相互关系.结果表明,随着植物群落的发展,铜尾矿废弃地表层尾矿微生物量和酶活性在不断增加;铜官山老尾矿废弃地白茅群落下表层尾矿(TBM)微生物量和酶活性与杨山冲尾矿废弃地及铜官山新尾矿废弃地表层尾矿微生物量和酶活性存在显著差异性(p<0.05).相关分析表明铜尾矿废弃地表层尾矿微生物量C、N与土壤有机质、总氮之间呈显著正相关(P<0.01);脱氧酶、碱性磷酸酶及脲酶与微生物量C、微生物量N、土壤有机质、总氮之问呈显著正相关(P<0.01),但过氧化氢酶与微生物量C、微生物量N、土壤有机质、总氮之间呈显著负相关(P<0.01).

Effects of plant communities on soil microbial biomass and enzyme activities in copper mine tailings dumps.

The microbial biomass C, N and dehydrogenase, catalase, alkaline phosphatase and urease activities in the upper layer of new Tongguanshan, Yangshanchong and old Tongguanshan copper mine tailings dumps with different plant communities were investigated in order to explore the relationships among plant community, microbial biomass C, N and soil enzyme activities. The results indicated that microbial biomass C, N and soil enzyme activities in the upper layer of copper mine tailings increased with development of vascular plant communities. A significant difference(p<0.01) was observed in the microbial biomass C, N and soil enzyme activities from the upper layer of Yangshanchong and new Tongguanshan copper mine tailings dumps and from old Tongguanshan copper mine tailings dump(TBM). Data analysis showed that there was a significantly positive correlation between organic matter, total nitrogen and microbial biomass C, N(p<0.01). Similarly, there was a significantly positive correlation between enzymes activities, including dehydrogenase, alkaline phosphataseand and urease, and microbial biomass C, microbial biomass N, organic matter and total nitrogen(p<0.01). However, a markedly negative correlation was presented between catalase activity, microbial biomass C, microbial biomass N, organic matter and total nitrogen(p<0.01).