Bartsev S. I., Pochekutov A. A. The Method for Determination of Parameters of the Phenomenological Continual Model of Soil Organic Matter Transformation
How to cite: Bartsev S. I., Pochekutov A. A. The method for determination of parameters of the phenomenological continual model of soil organic matter transformation // Sibirskij Lesnoj Zurnal (Siberian Journal of Forest Science). 2015. N. 3: 115–121 (in Russian with English abstract).
© Bartsev S. I., Pochekutov A. A., 2015
A possible method for experimental determination of parameters of the previously proposed continual mathematical model of soil organic matter transformation is theoretically considered in this paper. The authors previously proposed a continual model of soil organic matter transformation, based on using the rate of matter transformation as a continual scale of its recalcitrance, describes the transformation process phenomenologically without going into detail of microbiological mechanisms of transformation. Thereby simplicity of the model is achieved. The model is represented in form of one differential equation in first-order partial derivatives, which has an analytical solution in elementary functions. The model equation contains a small number of empirical parameters that generally characterize environmental conditions where the matter transformation process occurs and initial properties of the plant litter. Given the values of these parameters, it is possible to calculate dynamics of soil organic matter stocks and their distribution over transformation rate. In the present study, possible approaches for determination of the model parameters are considered and a simple method of their experimental measurement is proposed. An experiment of an incubation of chemically homogeneous samples in soil and multiple sequential measurement of the sample mass loss with time is proposed. An equation of time dynamics of mass loss of incubated homogeneous sample is derived from the basic assumption of the presented soil organic matter transformation model. Thus, fitting by the least squares method the parameters of sample mass loss curve calculated according the proposed mass loss dynamics equation allows determination of the parameters of the general equation of soil organic transformation model.