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Biodegradation of imazapyr in typical soils in Zhejiang Province, China

机译:浙江省典型土壤中吡虫啉的生物降解

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The degradation of imazapyr in non-sterile and sterile soils from four sampling sites in Zhejiang, China was studied. The results showed that the half-lives of imazapyr in non-sterile soils were in the range of 30 to 45 d, while 81 to 133 d in sterile(by autoclaving) soils. It means the rate constants of imazapyr under non-sterile conditions were 2.3--4.4 times faster than that under sterile (by autoclaving) conditions, evidently indicating that the indigenous microorganisms in soil play an important role in the degradation of imazapyr. The different sterilization methods could result in different degradation rates of imazapyr. The heat of sterilization of soil largely decreased the degradation. However, the sterile treatment of soil by sodium azide had a different effect from that by autoclaving. Further more, the mechanism was also discussed. Biodegradation in four non-sterile soils accounted for 62 percent to 78 percent of imazapyr degradation. In contrast, less than 39 percent of imazapyr degradation was associated with chemical mechanisms. Therefore, the degradation mechanism was predominantly involved in biology including organisms and microorganisms in soil. Two imazapyr-degrading bacterial strains were isolated in enrichment culture technique and they were identified as Pseudomonas fluorescenes biotype II (ZJX-5) and Bacillus cereus (ZJX-9), respectively. When added at a concentration of 50 mu g/g in mineral salts mediumCMSM), ZJX-5 and ZJX-9 could degrade 81 percent and 87 percent imazapyr after 48 h of incubation, For the treatment of incorporation of ZJX-5 or ZJX-9 into soil, the degradation rate enhanced 3--4 fold faster than that for control samples, which showed an important value in quick decontamination of imazapyr in soil.
机译:研究了浙江省四个采样点在非无菌和无菌土壤中吡虫啉的降解情况。结果表明,吡虫啉在非无菌土壤中的半衰期为30到45 d,而在无菌(高压灭菌)土壤中的半衰期为81到133 d。这意味着在非无菌条件下,吡虫啉的速率常数比无菌(高压灭菌)条件下的速率常数快2.3--4.4倍,这显然表明土壤中的本地微生物在吡虫啉的降解中起着重要作用。不同的灭菌方法可能导致吡虫啉的降解率不同。土壤的灭菌热大大降低了降解。但是,叠氮化钠对土壤的无菌处理与高压灭菌的效果不同。此外,还讨论了该机制。在四种非无菌土壤中的生物降解占吡虫啉降解的62%至78%。相反,只有不到39%的吡虫啉降解与化学机制有关。因此,降解机理主要涉及生物学,包括土壤中的生物和微生物。在富集培养技术中分离了两个降解吡虫啉的细菌菌株,分别鉴定为荧光假单胞菌生物型II(ZJX-5)和蜡状芽孢杆菌(ZJX-9)。当以50μg / g的浓度在矿物盐培养基(CMSM)中添加时,ZJX-5和ZJX-9在孵育48小时后可降解81%和87%的依米沙普利,用于ZZX-5或ZJX- 9进入土壤后,降解速率比对照样品提高了3--4倍,这对于吡虫啉在土壤中的快速去污具有重要价值。

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