【摘要】 为明确除草剂莠去津残留对黄麻田生态系统中微生物数量动态变化的影响,以菜用黄麻土壤为研究对象,对盆栽菜用黄麻喷施不同浓度(0（CK）、0.2、0.6、1.0 mg·kg^-1)莠去津,在施用后1、4、7、10 d采集土壤样品,利用稀释平板法测定土壤中细菌、真菌、放线菌的数量。结果表明:土壤细菌数量在莠去津浓度相同时随处理时间的延长在浓度为0.2 mg·kg^-1时呈现激活的趋势,在浓度为0.6～1.0 mg·kg^-1时呈先激活后抑制的趋势,在时间相同时随浓度增加细菌数量波动抑制,在第10天抑制率最大,达40.98%;土壤真菌数量在浓度相同时随时间的延长呈现激活-抑制-激活的趋势,处理时间相同随浓度的增加在1、4 d时呈现激活-抑制-激活的趋势,第7天呈现激活-抑制的趋势,在第10天抑制率最大,达37.93%;土壤放线菌数量在浓度相同时随时间延长呈现抑制-激活-抑制的趋势,在时间相同时随浓度的增加在1～4 d呈现先抑制后激活的趋势,在7～10 d呈现抑制-激活-抑制的趋势,在第7天抑制率最大达53.45%。由此可见莠去津残留对土壤中细菌、真菌、放线菌有一定的抑制作用,残留浓度越高对微生物的影响越显著,而且随着处理时间的延长抑制作用并未减弱。更多还原

【Abstract】 In order to clear the effect of atrazine residue on dynamic change of microbial quantity in the vegetable jute field.Vegetable jute field used as experimental materials.The herbicide atrazine levels of 0（CK）,0.2,0.6,1.0 mg·kg^-1 were applied in potted vegetables jute.Soil samples were collected in 1,4,7 and 10 days respectively.The number of bacteria,fungi and actinomycetes in soil was determined by dilution plate method.The results showed that,at the same concentration as the processing time is extended the number of soil bacteria showed a tendency of activation in 0.2 mg·kg^-1.When the concentration was 0.6-1.0 mg·kg^-1,it showed a trend of activation-inhibition.At the same days after spraying,with the increase of herbicide concentration the bacteria number showed fluctuation inhibition.The maximum inhibition rate of bacteria was 40.98% at 10 day.At the same concentration as the processing time is extended the number of soil fungi showed a tendency of activation-inhibition-activation.At the same concentration as the processing time is extended the number of soil actinomycetes showed a tendency of activation-inhibition-activation in 1 and 4 day,showed activation-inhibition in 7 day.The maximum inhibition rate of fungi number was 37.93% in 10 day.At the same concentration as the processing time is extended the number of soil actinomycetes showed a tendency of inhibition-activation-inhibition.At the same concentration as the processing time is extended the number of soil actinomycetes showed a tendency of inhibition-activation in 1 and 4 day,showed inhibition-activation-inhibition in 7-10 day.The maximum Inhibition rate of actinomycetes was 53.45% in 7 day.Therefore,atrazine residues can cause the inhibition of bacteria,fungi and actinomycetes in soil.The higher the residual concentration,the more significant effect on soil microorganism.The inhibition did’nt decrease with the extension of processing time.更多还原