Xiao Wen-Dan, Yang Xiao-E, Li Ting-Qiang
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Huan Jing Ke Xue. 2012 Nov;33(11):3983-9.
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 x kg(-1) and 10.0 mg x 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 x 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 x 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 x kg(-1)), while the half life time was increased by 74.4% -109.4% with the addition of high level of Cd (50 mg x 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.
通过实验室微观模拟实验，研究了微生物、土壤湿度和镉（Cd）对稻田土壤中多菌灵降解的影响。结果表明，灭菌土壤中多菌灵（5.0 mg·kg⁻¹和10.0 mg·kg⁻¹）的半衰期是非灭菌土壤的12.6 - 13.8倍。接种多菌灵降解菌株后，多菌灵的半衰期降低了32.1% - 37.1%。当土壤湿度从田间持水量的40%增加到60%或80%时，多菌灵的半衰期分别降低了46.2%或74.0%。低浓度Cd（5 mg·kg⁻¹）促进了土壤中多菌灵的降解，半衰期降低了32.1% - 52.4%，但高浓度Cd（50 mg·kg⁻¹）抑制了土壤中多菌灵的降解，半衰期增加了92.6% - 103.0%。对于接种了多菌灵降解菌株的土壤，添加低浓度Cd（5.0 mg·kg⁻¹）时，多菌灵的半衰期降低了34.0% - 34.4%，而添加高浓度Cd（50 mg·kg⁻¹）时，半衰期增加了74.4% - 109.4%。结果表明，土壤中的土著微生物是影响多菌灵在土壤中降解的关键因素，多菌灵降解菌株、高土壤湿度和低Cd浓度可促进多菌灵的降解。
