甲氰菊酯降解菌Sphingomonas sp.JQL4-5对污染土壤的生物修复

Bioremediation of Fenpropathrin-Contaminated Soil by Sphingomonas sp.JQL4-5

JQL4-5(Sphingomonassp.)是1株从长期受农药污染土壤中分离的甲氰菊酯降解菌,考察了其在实验室模拟条件下对甲氰菊酯污染土壤的生物修复能力及其影响因素.结果表明,降解菌株在灭菌土壤中的降解效果要略好于未灭菌土壤,在土壤外源添加降解菌106CFU.g-1,温度20-40℃,pH为6.5-7.5的条件下,该菌株能有效降解土壤中10-200 mg.kg-1的甲氰菊酯.可以将其应用于甲氰菊酯污染土壤的生物修复.

JQIA-5（ Sphingomonas sp. ）, a fenpropathrin-degrading strain isolated from soils exposed to repeated pesticides contamination, was used in this work to study factors affecting its degrading capacity of fenpropathrin in soil microcosms. In sterilized soil, the degradation rates of fenpropathrin by JQIA-5 were faster than those in unsterilized soil. Various factors, including soil pH, temperature, initial fenitrothion concentration, and inoculum size influenced its degradation efficiency. The addition of 106 CFU·g^-1 was able to degrade varying concentrations （10 - 200 mg· kg^-1 soil） of fenpropathrin over a temperature range of 20 -40 ℃ and pH range （6.5 - 7.5）. The results indicated that strain JQIA-5 has potential use in bioremediation of fenpropathrin-contaminated soil.