1. General Model Information
Name: The model with two parameters for microbial degradation of pesticides
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: ordinary differential equations
Keywords: pesticide,degradation,simple model
The concentration of pesticide at time t, is related to the growth of pesticide-degrading microorganisms, at the initial concentration of pesticide, and the concentration of pesticide when -dx/dt reaches its maximum, if the time when -dx/dt reaches its maximum, and t1/2 the half-time for the loss of pesticide.
Describing the variation with time of the concentration of organic compounds (e.g. pesticides) in soil.
Source of the Abstract:
Joergensen S.E., B. Halling-Soerensen and S.N Nielsen (Edts.) 1996: Handbook of Environmental and Ecological Modelling. CRC Press Boca Raton et al. 672 pp.
II. Technical Information
Operating System(s): DOS
Programming Language(s): BASIC
III. Mathematical Information
Liu, D.S., and Zhang, S.M., 1987. Kinetic model for degradative processes of pesticides in soil. Ecol. Modelling, 37: 131-138.
Liu, D.S.; Zhang, S.M. and Li, Z.G. 1988. Study on rate model of microbial degradation of pesticides in soil. Ecol. Modelling, 41: 75- 84. ( Model with 3 parameters for microbial degradation of pesticides)
Zhang, S.M.; Liu, D.S.; Wang, Z.S. and Ma, X.F. 1993. A kinetic model describing the effect of temperature on the loss rate pesticides in soil. Ecol. Modelling, 70: 115- 125.
V. Further information in the World-Wide-Web
VI. Additional remarks
The rate of degradation is proportional to the concentration of pesticide (x) and the number of pesticide-degrading microorganisms (m) i.e., -dx/dt=kxm, where k is the rate constant. This concept is the basic premise from which the model with two parameters is derived.
Last review of this document by: R. Patzak , 03.September 1997
Status of the document:
last modified by
Joachim Benz Tue May 9 14:01:33 CEST 2006