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首页> 外文会议>220th American Chemical Society, Meeting 2000 Washington, D.C. >Effect of Variability of Soil Properties as a Function of Depth on Pesticide Sorption-Desorption
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Effect of Variability of Soil Properties as a Function of Depth on Pesticide Sorption-Desorption

机译：土壤性质随深度的变化对农药吸附-解吸的影响

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摘要

Sorption-desorption is arguably the most important process affecting the transport of pesticides through soil since it controls the amount of chemical available for transport. Sorption is usually characterized by determining surface soil sorption coefficients that are then used in solute transport models. Significant drawbacks to using surface soil sorption coefficients to predict pesticide transport are the spatial variability of 1) surface soil properties over large fields and 2) soil properties in the soil profile. Our objective is to give an overview of how pesticide sorption and desorption is influenced by changes in soil properties with depth. This will be illustrated using several classes of pesticides. Specific pesticides include atrazine, alachlor, sulfometuron methyl, tebuthiuron, and imidacloprid. Results indicate that correlations between pesticide sorption-desorption and soil properties of surface soils cannot necessarily be used to characterize pesticide sorption-desorption in subsurface soils.
机译：吸附解吸可以说是影响农药通过土壤运输的最重要过程，因为它控制着可运输的化学物质的量。吸附的特征通常是确定表面土壤的吸附系数，然后将其用于溶质运移模型。使用表层土壤吸附系数来预测农药运输的重大缺陷是空间变异性：1）大田地表土壤特性和2）土壤剖面中的土壤特性。我们的目的是概述土壤性质随深度的变化如何影响农药的吸附和解吸。这将使用几种农药来说明。具体的农药包括阿特拉津，甲草胺，甲基磺胺磺隆，替布噻隆和吡虫啉。结果表明，农药吸附-解吸与表层土壤的土壤特性之间的相关性不一定用于表征地下土壤中农药的吸附-解吸。

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