Effects of bio-crust on soil microbial biomass and enzyme activities in |copper mine tailings.
生物结皮对铜尾矿废弃地土壤微生物量及酶活性的影响

Bio-crust is the initial stage of natural primary succession in copper mine tailings. With the Yangshanchong and Tongguanshan copper mine tailings in Tongling City of Anhui Province as test objects, this paper studied the soil microbial biomass C and N and the activities of dehydrogenase, catalase, alkaline phosphatase, and urease under different types of bio-crust. The bio-c rusts improved the soil microbial biomass and enzyme activities in the upper lay er of the tailings markedly. Algal crust had the best effect in improving soil m icrobial biomass C and N, followed by moss-algal crust, and moss crust. Soil mi croflora also varied with the type of bio-crust. No significant difference was observed in the soil enzyme activities under the three types of bio-crust. Soil alkaline phosphatase activity was significantly positively correlated with soil microbial biomass and dehydrogenase and urease activities, but negatively corre lated with soil pH. In addition, moss rhizoid could markedly enhance the soil mi crobial biomass and enzyme activities in moss crust rhizoid.