外源铀胁迫对铀矿区土壤环境质量生物学指标的影响

摘要

Objective] The aim was to investigate the change of soil functions under the second uranium contamination in the uranium mining area.[Method] Different concentrations of exogenous uranium stress was conducted on soil samples from uranium mining area, the relevant biological indicators were determined.[ Result] The result showed that the main heavy metal elements found in the polluted area were As , Ge and U.The increasing concentration of exogenous uranium pollution inhibited the microbial quantity, glucose enzyme activity, catalase activity and urease activity to different extent.A significant positive correlation was shown to exist between exogenous uranium pollution and soil meta-bolic quotient whereas a negative correlation between exogenous uranium pollution and microbial biomass carbon, microbial biomass nitrogen as well as microbial quotient.[ Conclusion] These biological indicators can express the evolution of soil environmental quality under the exoge-nous heavy metal pollution.%[目的]考察二次铀污染下铀矿区土壤功能的变化情况。[方法]对铀矿区的土壤样品进行不同浓度外源铀胁迫处理，对相关生物学指标进行测定。[结果]原土壤主要受砷、镉、铀的复合污染，外源铀胁迫浓度增加，使土壤微生物数量减少，对土壤葡萄糖酶、过氧化氢酶和脲酶的活性具有不同程度的抑制作用，与土壤代谢熵呈显著正相关，而与微生物生物量碳、微生物生物量氮、微生物熵均呈显著负相关。[结论]土壤环境质量生物学指标可以表征重金属胁迫下土壤环境质量的变化情况。