论文部分内容阅读
采用实验室盆栽方法,运用正交试验探究盐与复配农药甲维盐·毒死蜱的复合污染对菜地土壤中酶活性与微生物数量的影响。结果表明:盐胁迫和甲维盐·毒死蜱分别作用下土壤中的脲酶、蔗糖酶、脱氢酶和过氧化氢酶活性均受到不同程度的抑制作用,且随着盐分水平和甲维盐·毒死蜱浓度的升高呈显著下降趋势;土壤细菌、真菌和放线菌数量亦随土壤盐分和甲维盐·毒死蜱浓度的增加而减少。随着时间的延长,农药在土壤中不断被降解而减少,对微生物的毒害性也就随着减弱,并最终恢复到与对照组相一致的水平。但是在与高盐复合胁迫时,土壤微生物数量与土壤酶活性始终处于被抑制状态,由此可以说明盐胁迫是抑制土壤微生物数量和酶活性的主导因素。
The pot experiment was conducted to study the effect of compound pollution of salt and compound pesticide carbaryl chlorpyrifos on enzyme activity and microbial population in vegetable field. The results showed that the activity of urease, sucrase, dehydrogenase and catalase in soil were inhibited to varying degrees by salt stress and carbaryl chlorpyrifos, respectively. With the increase of salinity level and chlorpyrifos The concentration of soil bacteria, fungi and actinomycetes also decreased with the increase of soil salt concentration and the concentration of carbaryl and chlorpyrifos. With the extension of time, pesticides are continuously degraded in the soil and reduced, and the toxicity to microorganisms is also weakened, and eventually it is restored to the same level as the control group. However, when combined with high salinity, the amount of soil microbes and soil enzyme activity were always inhibited, which shows that salt stress is the dominant factor that inhibits soil microbial quantity and enzyme activity.