Abstract
Parametrization of the simulation model DNDC (DeNitrification-DeComposition) to estimate components of carbon biogeochemical cycle in arable soils of the European part of Russia was the aim of the research. Methodological recommendations for DNDC using were developed on the base of official statistical data, literature sources, as well as our results obtained earlier during initial approbation of the model. Principles of preparing the input information such as natural (climatic and soil conditions) and anthropogenic (tillage, fertilization, crops yield) factors had been established. Internal parameters of the model including soil characteristics (depth of top soil, C:N ratio, and soil organic carbon fractions) and crops biology (heat and water demand, C:N ratio, and biomass fractions) had been corrected; also standardized description of the main cultivation technologies were developed in the model’s format. The method for evaluation of modelling efficiency had been offered; it is the complex consisting of five criteria: Nash-Sutcliffe coefficient, Theil coefficient, Pearson correlation coefficient, ANOVA, and F-test of equality of variance. For verification of the adapted model DNDC to Russian conditions, data of two field experiments aimed at measuring СО2 emissions in Kursk and Moscow regions had been used as well as published information about СО2 emission and carbon balance in arable soils in Kursk, Moscow, Orel, Samara, and Vladimir regions. At the step of verification accuracy of obtained results had been acknowledged by set of relevant statistical criteria: there was medium correlation between experiment values of CO2 emission and modelled ones; as results of ANOVA showed, the average measured value of emission and calculated one are similar; Theil coefficients less than 0,3 and positive Nash-Sutcliffe coefficients confirmed correctness of changes inputted in the model. It had been proved that the developed parametrization method is effective for estimating components of carbon biogeochemical cycle in the European part of Russia.
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