| 多菌灵在农田土壤中的降解及其影响因子研究 |
| 摘要点击 3630 全文点击 1597 投稿时间：2011-12-18 修订日期：2012-05-23 |
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| 中文关键词 多菌灵 降解动态 多菌灵降解菌 土壤含水量 Cd |
| 英文关键词 carbendazim degradation carbendazim degrading bacteria soil moisture cadmium |
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| 中文摘要 |
| 采用实验室模拟方法,研究了微生物、含水量和Cd对土壤中多菌灵降解动态的影响. 结果表明,土壤中多菌灵 (5.0 mg·kg-1和 10.0 mg·kg-1)的降解半衰期在灭菌条件下为非灭菌条件下的 12.6~13.8倍; 复合降解菌群(枯草杆菌、副球菌、黄杆菌和假单胞菌)的加入显著缩短了土壤中多菌灵的降解半衰期(32.1%~37.1%); 当土壤含水量由 40%田间持水量提高到 60%或80%田间持水量,多菌灵降解半衰期缩短 46.2%或74.0%; 低浓度Cd (5.0 mg·kg-1)的加入显著缩短了土壤中多菌灵的降解半衰期(32.1%~52.4%),而高浓度的Cd (50 mg·kg-1)延长多菌灵的降解半衰期(92.6%~103.0%); 对添加复合降解菌群的土壤,低浓度Cd (5.0 mg·kg-1)的加入同样显著缩短了土壤中多菌灵的降解半衰期(34.0%~34.4%),高浓度的Cd (50 mg·kg-1)延长多菌灵的降解半衰期(74.4%~109.4%). 研究表明,土著微生物在多菌灵降解过程中发挥重要的作用,多菌灵降解菌群、较高的土壤湿度和低浓度的Cd也促进了土壤中多菌灵的降解. |
| 英文摘要 |
| The influences of microorganism, soil moisture and cadmium (Cd) on degradation of carbendazim in paddy soil were investigated with laboratory microcosm experiments. The results showed that the half-life of carbendazim (5.0 mg·kg-1and 10.0 mg·kg-1) in sterilized soils was 12.6-13.8 times of those in non-sterilized soils. The half-life of carbendazim was decreased by 32.1%-37.1% when the soils were inoculated with carbendazim-degrading strains. When the soil moisture was increased from 40% to 60% or 80% of water holding capacity, the half life of carbendazim was decreased by 46.2% or 74.0%, respectively. Low level of Cd (5 mg·kg-1) enhanced the degradation of carbendazim in soils with half-life time decreased by 32.1%-52.4%, but high level of Cd (50 mg·kg-1) inhibited the degradation of carbendazim in soils with half-life time increased by 92.6%-103.0%. For the soils inoculated with carbendazim-degrading strains, the half life of carbendazim was decreased by 34.0%-34.4% with the addition of low level of Cd (5.0 mg·kg-1), while the half life time was increased by 74.4%-109.4% with the addition of high level of Cd (50 mg·kg-1). The results demonstrate that indigenous microorganisms is a critical factor that influences carbendazim degradation in soils, and that carbendazim-degrading strains, high soil moisture and low Cd level enhance the degradation of carbendazim. |
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