甲基对硫磷长期污染对土壤微生物的生态效应

Ecological effects of long-term methylparathion contamination on soil microflora

研究了有机磷农药甲基对硫磷长期污染对土壤微生物的影响,结果表明:污染土壤中细菌、放线菌、真菌数量变化不大,自生固氮菌和反硝化细菌数量减少,氨化细菌、亚硝化细菌、硝化细菌数量有所增加;与对照土壤相比,污染土壤呼吸作用下降29.93%,而氨化作用和硝化作用则增强。1g对照土壤(以干土计)中微生物总DNA提取量为(13.01±1.91)μg,污染土壤中则为(12.23±1.36)μg。

Long-term effects of methylparathion contamination on soil microflora were investigated.Little difference in total counts of bacteria,actinomycetes and fungi was observed between the contaminated and the non-contaminated soil.Compared with the control,the contaminated soil was slightly lower in total count of azotobacters and denitrifying bacteria and significantly higher in those of ammonifying and ammonia-oxidizing and nitrifying bacteria.The respiratory intensity of the contaminated soil decreased by 29.93% while ammonification and nitrification increased significantly over that of control soil.The total DNA extracted from the contaminated soil and the control was (12.23±1.36)μg·g^(-1) and (13.01±(1.91))μg·g^(-1) dry soil,respectively.