降解菌HD接种和非接种根围土壤中丁草胺的降解动力学研究
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*国家自然科学基金(39870504);浙江省自然科学基金(399487、301050)资助项目


DYNAMICS OF BUTACHLOR BIODEGRADATION IN THE ROOT-ZONE SOILS AND THE SOIL INOCULATED WITH A MIXTURE HD OF BACTERIAL STRAINS DEGRADING BUTACHLOR
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    摘要:

    测定了小麦、棉花、水稻和玉米根围土壤和非根围土壤中丁草胺的降解特征和降解菌变化动态.结果表明,种植作物丰富了土壤微生物,根围土壤丰富的微生物对丁草胺的降解具有显著的促进作用.根围土壤中丁草胺的降解是非根围土壤的1.63~2.34倍,相应的半衰期缩短为非根围土壤的42.2%~72.8%.根围土壤接种处理后这种促进作用得到进一步加强,其降解速率是非根围土壤的1.68~2.83倍,半衰期为非根围土壤的34.4%~59.4%.试验结果表明,作物根围是丁草胺残留快速降解的微环境,作物根围接种处理可以强化丁草胺残留的微生物降解.

    Abstract:

    The degradative characteristics of butachlor in the root-zone soils of different crops such as wheat, cotton,rice,maize and the bulk soils,and microbial population dynamics of culturable microorganisma capable of utilizing butachlor were investigated.A larger microbial population was measured in these crop rhizosphere soils compared to the non-rhizosphere soils.The increased population enhanced biodegradation of butachlor in the rhizosphere soils as compared to that in the non-rhizosphere soils.The degradative rates of butachlor in the wheat-,cotton-,rice-,or maize-rhizospheres were 1.63-2.34 times of those in nonrhizospheres,and the corresponding half-lives were shorten to be 42.2%-72.8% of those in the nonrhizoshere.The enhancemerrt in biodegradation was further strengthened by the inoculation of a bacterial strain mixture capable of utilizing butachlor as sole carbon and energy sources.Compared with those in the non-rhizosphere,the degradative rates in the rhizospheres increased up to 1.68-2.83 times after the inoculation.The microcosm in crop root-zone soil may be the optimal site for rapid degradation of residual pesticidesbutacholr.

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虞云龙,潘学冬,陈英旭.降解菌HD接种和非接种根围土壤中丁草胺的降解动力学研究[J].土壤学报,2002,39(4):575-581. DOI:10.11766/trxb200201100418 Yu Yun-long, Chen Ying-xu, Pan Xue-dong. DYNAMICS OF BUTACHLOR BIODEGRADATION IN THE ROOT-ZONE SOILS AND THE SOIL INOCULATED WITH A MIXTURE HD OF BACTERIAL STRAINS DEGRADING BUTACHLOR[J]. Acta Pedologica Sinica,2002,39(4):575-581.

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  • 收稿日期:2002-01-10
  • 最后修改日期:2002-03-01
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  • 在线发布日期: 2013-02-25
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