关于土壤中农药降解动力学建模的研究  

STUDY ON MODELLING FOR DEGRADATION KINETICS OF PESTICIDES IN SOIL

作　　者：刘多森[1] 张水铭[1] 李振高[1] 潘映华[1] 汪枞生[1] 

机构地区：[1]中国科学院南京土壤研究所,210008

出　　处：《土壤学报》1993年第2期199-207,共9页Acta Pedologica Sinica

基　　金：国家自然科学基金;中国科学院土壤圈物质循环开放研究实验室基金

摘　　要：本文经实验证实农药微生物降解的速度模型:—dx/dt=kxm,其中x是农药在时间t的浓度,k是速度常数,m是可降解农药的微生物在时间t的数量。就渍水土壤中r体六六六的微生物降解而言,—dx/dt与xm(x与m的乘积)之间存在着强正相关,这里x是r体六六六浓度,m是细菌数.按照m与x的非线性关系,即m=ζ_1+ζ_2x+ζ_3x^2(ζ_(19)ζ_2和ζ_3是常数),细菌数与r体六六六浓度之间呈显著相关。本文进一步讨论了可描述农药浓度和温度对土壤中农药消失速度影响的动力学模型。Through experiments, this paper verifies a rate model for microbial degradation of pesticides: -dx/dt= kxm, where x is the concentration of pesticide at time t,k the rate constant, and m the number of pesticide-degrading microorganisins at time t. For microbial degradation of r-BHC in a submerged soil, there was a strong positive correlation between -dx/dt and xm (the product of x and m) where x is the concentration of r-BHC, and m the bacterial count. According to a nonlinear relation between rn and x:m=ξ_1 +ξ_3x^2+ξ_3x^2 (ξ_1,ξ_2 and ξ_3 are constants), there was a significant correlation between the bacterial count and the concentration of r-BHC. This paper further discusses kinetic models describing the effect of pesticide concentration and temperature on the loss rate of pesticides in soil.

关 键 词：农药 降解 动力学模型 

分 类 号：S154[农业科学—土壤学]