低浓度Pb^2＋对Cd^2＋污染下冬小麦幼苗根微域土壤水解酶活性及与根微域土壤生化特征关系的影响

采用盆栽试验法探讨了Cd^2＋、低于国家“土壤环境质量标准”规定的II类土壤环境基准值300mg-kg^-1干土时的Pb^2＋与Cd^2＋复合处理对冬小麦幼苗根微域土壤磷酸酶、转化酶和脲酶活性及与根微域土壤微生物数量和生化特征关系的影响特征。结果表明：（1）Cd^2＋对冬小麦幼苗根微域土壤转化酶、脲酶和磷酸酶活性表现为显著抑制效应；而低浓度Pb^2＋主要表现为协同Cd抖污染抑制根微域土壤水解酶活性效应；（2）Cd^2＋处理下，磷酸酶活性与微域土壤有机质含量呈极显著正相关；转化酶活性与细菌、真菌和放线菌数量呈显著负相关，与有机质呈显著正相关；脲酶活性与细菌、真菌和放线菌数量及微生物量碳表现为极显著正相关；（3）Pb^2＋／cd^2＋处理下，碱性磷酸酶活性与微生物量碳表现为显著正相关；转化酶活性与全氮含量表现为显著负相关，与有机质含量呈极显著正相关；脲酶活性与全氮呈极显著正相关，与有机质为极显著负相关，总体来讲，Cd^2＋／Pb2＋与Cd^2＋处理之间酶活性与生化特征的关系存在明显差异；同时Pb^2＋／Cd^2＋处理下磷酸酶、转化酶和脲酶活性与土壤微生物数量之间的相关性特点与Cd^2＋处理下也明显不同。

Effects of Cd and low concentration Pb/Cd on hydrolase activity and the relationship between them and biochemical characters in winter wheat seedlings rhizosphere soil

The study explored the effects of Cd2+ and low concentration Pb2+(<350.00 mg.kg-1)/Cd2+on the activity of rhizosphere soil phosphatase,urease,and invertase activity from winter wheat seedlings and the relationship between them and rhizosphere soil microbial quantity and biochemical activity through pot experiment.The results indicated that:(1) the repression effect of Cd2+ on rhizosphere soil phosphatase,urease,and invertase activity was significant,and low concentration Pb2+ strengthened the influence of C...