应用传递函数模型预报农药阿特拉津在土壤中的运移

本文首先对农药阿特拉津(Atrazine)在稳定流场饱和均质土壤中的运移进行了室内实验研究，采用易混合置换的方法，获得了示踪溶质Br-和Atrazine同步脉冲输入1h后的出流浓度动态；其次由批技术得到Atrazine的分配系数，进而获得阻滞因子，在此基础上应用传递函数模型，根据示踪溶质的迁移预报了吸附作用存在时Atrazine在土壤中的运移动态。

Application of transfer function model to predict transport of Atrazine in soil

Laboratory experiment was conducted to investigatethe fate and mobility of Atrazine,a commonly used herbicide,in soil.The transfer function model(TFM) was applied to describe the pesticide transport under steady water flow in saturated homogeneous soil.The objective of this study is to quantify the transport processes of Atrazine in sandy loam through TFM and miscible displacement experiment.The model can be used to characterize the Atrazine transport behavior through soil column with a narrow solute pulse input and with adsorption determined by batch technique.The lognormal probability density function(PDF) was used to fit the drainage effluent data of tracer (bromide).The travelingtime pdf of a linearly adsorbed Atrazine was estimated in terms of the pdf of tracer,and the dynamics of concentration and cumulative quantity leached in the soil were predicted.It was shown that the predicted result is reasonable.