Berns Anne E, Schnitzler Frauke, Drewes Norbert, Vereecken Harry, Burauel Peter
Institute of Chemistry and Dynamics of the Geosphere, Institute 4: Agrosphere, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
Environ Toxicol Chem. 2007 Oct;26(10):2151-7. doi: 10.1897/07-009R.1.
The effect of organic carbon amendment on the fate of benazolin was investigated in undisturbed soil columns. The soil columns were obtained from three different soil types located in three different regions with different crop production regimes. All soils were operated in a normal crop production regime, and one of the soils was additionally operated in low and high crop production regimes. Two experimental setups were conducted, one using [(14)C]maize straw and nonlabeled benazolin and one using nonlabeled maize straw and [(14)C]benazolin. The column experiments with [(14)C]maize straw showed that the residual crop residues remained mainly in the top layer. Benazolin and its metabolites showed a higher retention in columns that were amended with maize straw compared to column without amendment. The production regimes of the soils did not influence the behavior of benazolin. The effect of maize straw incorporation on the translocation and degradation of benazolin could well be caused by a change in the soil microbial activity, leading to an enhanced degradation of benazolin and producing metabolites exhibiting a sorption behavior different from the parent.
在原状土柱中研究了有机碳改良剂对苄草唑归宿的影响。土柱取自位于三个不同地区、具有不同作物生产模式的三种不同土壤类型。所有土壤均按正常作物生产模式运作，其中一种土壤还按低产和高产作物生产模式运作。进行了两种实验设置，一种使用[¹⁴C]玉米秸秆和未标记的苄草唑，另一种使用未标记的玉米秸秆和[¹⁴C]苄草唑。用[¹⁴C]玉米秸秆进行的柱实验表明，残留的作物残茬主要留在顶层。与未改良的柱相比，苄草唑及其代谢物在用玉米秸秆改良的柱中保留率更高。土壤的生产模式不影响苄草唑的行为。玉米秸秆添加对苄草唑迁移和降解的影响很可能是由土壤微生物活性的变化引起的，导致苄草唑降解增强，并产生吸附行为与母体不同的代谢物。
