中文摘要：

为研究灌溉农田中地表径流引起的溶解态污染物溶质流失的规律，考虑到田间实际操作情况以及与入渗率有关的非完全混合系数的时效性，遵循质量守恒和水量平衡原理，建立了简单的二层解析模型并得到解析结果．根据前人的试验结果，利用所提出的模型，分析了地表径流水中的溶解态污染物溶质质量浓度．结果表明：模型设计合理、简单实用，且弥补了扩散理论模型的不足，适用于土壤入渗率较高的情况；最后，针对性地提出了具体措施来减少农田溶解态污染物肥料的溶质流失，为农业面源污染和提高农田肥料的利用提供有意义的参考．

英文摘要：

To study the chemical loss of soluble contaminant in runoff water from irrigated field, a simple two-layer analytical model was developed. Practice of field and temporal imcomplete mixing parameters about infiltration were considered. Based on mass conservation and water balance equations analytical solution was obtained indirectly. According to the published experimental results, the soluble contaminants concentrations in runoff water were modeled. The model results showed that this simple two-layer model is reasonable and practical, which makes up the shortage of diffusion model and is suitable for high soil infiltration. At last, some steps were proposed to reduce the loss of soluble contaminative fertilizer in the field accordingly, which provided references for agricultural non-point pollution and the utilization of fertilizer in field.