对公路两侧土壤中铅(Pb)累积模式的理论探讨

The Theoretical Approach to Accumulating Model of Lead (Pb) Content in the Soil of the Sides of Highway

针对公路环境影响评价中公路两侧土壤中Ｐｂ含量预测公式在某些情况下计算结果与实际不符的问题，应用土壤生态学理论分析了土壤这一生态系统的动态变化过程，从物质平衡方程入手，推导了预测公路两侧土壤中Ｐｂ含量累积模式，并对此模式进行了论证分析和比较，研究结果表明，应用本文提出的公式，其预测结果与公路两侧土壤中Ｐｂ累积的实际情况基本一致。

In the highway environmental impact assessment, because of calculating resuilts of accumulating model of Pb content in the soil of the sides of highway are usually inconsistent with the practice, the kenetic variation process of the soil ecological system is analysed in application of the soil ecological theory. A correct model of predicting Pb. content in the soil is developed from the material balance equation, and the model is also demenstrated and compared. It is known that the calculating resuilts by using the model developed in the paper are consistent with the practice condition.