冻融作用对土壤中阿特拉津微生物降解的影响研究

Effect of freezing and thawing on the biodegradation of atrazine in the soil

通过室内模拟分析,研究了阿特拉津污染土壤经过冻融循环后,土壤温度、含水量、孔隙度、水溶性有机碳、微生物细胞活性及阿特拉津残留量的变化特征.结果表明:在消融3.5～7.5 h温度发生显著变化,消融期随着时间变化,含水率呈递减的趋势;土壤孔隙度的变化趋势呈现先减小后增大,变化较缓;土壤有机碳在消融1～2 h有释放,然后呈下降趋势;消融初期,微生物细胞活性较弱,随着时间增加,微生物活性开始释放,相应的阿特拉津残留量也有降低的趋势.

The soil temperature,water content,porosity,water-soluble organic carbon,microbial cell activity and the concentration of arazine in the soil contaminated by atrazine through the freeze-thaw cycle were studied by indoor simulation.The results showed that the soil temperature had obvious changes during after 3.5～7.5hs＇ thawing.The water content decreased with the time during the thawing.The porosity of 3 different depths of soil decreased at first and then increased.The water-soluble organic carbon discharged at the beginning 1～2 h,and then decreased.The microbial cell activity in the soil was weak at first,with the passage of time it began to increased and the concentration of atrazine in the soil then decreased correspondingly.