农药降解的非线性动力学模型研究

Study on the Non-linear Kinetic Model for Degradation of Pesticides

从分析农药降解的机理及影响农药降解的环境因素出发 ,根据系统动力学原理 ,导出了一种定量描述农药残留动态的非线性动力学模型 ,并给出了模型参数的估计方法。结果表明 :该模型及其参数具有直观的实际背景和生物学意义 ,且当模型参数 a >1 /2及 a≤ 1 /2时 ,该模型可以分别描述农药降解曲线有无拐点的两种情况 ,从而推广了一级动力学模型及双曲速度模型 。

Based on the analysis of degradation mechanism for pesticides and environmental factor, a new non linear kinetic model for describing residual process of pesticides by the system kinetic theory and the method of its parameters estimation were given in this paper. The results showed that this model and its parameters had intuitively practical background and biological significance, and could describe the case in which whether the curve of pesticides degradation had point of inflection or not when a>1/2 or a≤1/2.Therefore,the model extended the power rate model and hyperbolic rate model and had theoretical and practical value.