降解菌S113对甲磺隆污染土壤生物修复作用的研究
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国家自然科学基金项目(30500010);国家“863”计划项目(2006AA10Z402);江苏省社会发展项目(BS2007056)


BIOREMEDIATION OF METSULFURON-METHYL-CONTAMINATED SOIL BY S113
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    摘要:

    在室内条件下,研究了降解菌S113(Methylopila sp.)对甲磺隆污染土壤的修复作用。S113能够以甲磺隆为唯一碳源生长,72h对50mgL-1甲磺隆的降解率达98.38%。投加降解菌S113可显著提高土壤中甲磺隆的降解速率。当甲磺隆浓度为10mgkg-1干土,S113接种量为108个g-1土时,第30天土壤中甲磺隆降解率为76.9%,对照土壤中甲磺隆降解率仅为11.9%。S113降解甲磺隆的速率和接种量呈正相关,当接种量减少为105个g-1干土时,降解菌对甲磺隆的降解作用微弱。在土壤中甲磺隆浓度较低的条件下,S113的降解效果显著,而当土壤中甲磺隆浓度达到50mgkg-1时,甲磺隆降解率仅为39.6%。S113降解土壤中甲磺隆的最适温度为30℃,第30天的降解率可达75.9%。当温度为25℃、20℃时,第30天甲磺隆降解率仅为53.5%和23.9%。S113菌剂灌根,能不同程度地缓解土壤中浓度为40、80μgkg-1的甲磺隆对玉米生长的抑制作用,但当甲磺隆浓度增加到120μgkg-1时,接种S113对药害解除作用不显著。结果表明,人工接种降解菌S113,能有效去除土壤中甲磺隆残留。

    Abstract:

    Bioremediation of metsulfuron-methyl contamined soil with S113(Methylopila sp.)was studied under laboratory conditions. S113 was capable of utilizing metsulfuron-methyl as its sole carbon source for growth and degrading 98.38% of the 50 mg L-1 metsulfuron-methyl within 72 h. Addition of S113 could prominently accelerate degrading of metsulfuron-methyl. When S113 was inoculated into the soil at a rate of 10 8 cells g-1 dry soil,76.9% of the metsulfuron-2methyl(10 mg kg-1 dry soil)in the soil was degraded after 30 days,whereas only 11.9% was degraded in CK.When inoculation rate decreased to 105 g-1 dry soil,the action of S113 degrading metsulfuron-methyl in soil was not distinct,showing that degradation rate was related positively to the amount of inoculation,When metsulfuron-methyl was low in concentration,S113 was effective. When the concentration of metsulfuron-methyl was increased to 50 mg kg-1,metsulfuron-methyl degradation rate was only 39.6%. Soil temperature also affected metsulfuron 2methyl degradation rate1 When it was 30℃,the rate reached 75.9% in 30 days,whereas when it was 25℃ and 20℃,the rate was lower to 53.5% and 2319%,respectively. Pouring S113 solution around the roots with S113 solution could mitigate the inhibitive effect of metsulfuron-methyl at 40 or 80μg kg-1 on maize growth to a varying degree. When the concentration of metsulfuron-methyl increased to 120μg kg-1,the mitigating effects were not distinct. The findings suggest that arti-ficial inoculation of S113 could effectively degrade metsulfuron-methyl in soil.

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黄星,潘继杰,孙纪全,孙笑非,李顺鹏.降解菌S113对甲磺隆污染土壤生物修复作用的研究[J].土壤学报,2008,45(1):150-154. DOI:10.11766/trxb200604120120 Huang Xing, Pan Jijie, Sun Jiquan, Sun Xiaofei, Li Shunpeng. BIOREMEDIATION OF METSULFURON-METHYL-CONTAMINATED SOIL BY S113[J]. Acta Pedologica Sinica,2008,45(1):150-154.

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  • 收稿日期:2006-04-12
  • 最后修改日期:2006-11-14
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  • 在线发布日期: 2013-05-10
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