[Effects of atrazine and its degrader Exiguobaterium sp. BTAH1 on soil microbial community].

The study showed that the application of atrazine stimulated soil microorganisms obviously. In comparing with control(without atrazine), the respiration intensity of soil applied with 50 mg atrazine kg(-1) soil increased greatly, the concentrations of soil NH4(+)-N and NO3(-)-N changed significantly, and the individuals of soil microbes, especially bacteria and fungi, also increased greatly. The application of strain BTAH1 could degrade 98% of applied atrazine within one week, and led to the decrease of soil respiration intensity. Under BTAH1 application, the individuals of actinomyces and fungi decreased, while those of bacteria did not, and the concentrations of soil NH4(+)-N and NO3(-)-N came back to the level of the control. ARDRA analysis on the 16s rDNA library of soil bacteria suggested that the application of atrazine could decrease the biodiversity of soil microorganisms, while applying BTAH1 could recover the biodiversity.