Inhaltszusammenfassung

Two theoretical concepts of the formation of the soil organic matter (OM) system are considered as a methodological basis for the mathematical simulation of its dynamics. In the theory of physical protection of OM without the formation of humic substances with the physical fractionation methodolody, the main focus is on the functional parameters of the OM components separated by their mineralization rates. Here, two conceptual disadvantages are noted: (a) neglect of the specificity of OM tra...Two theoretical concepts of the formation of the soil organic matter (OM) system are considered as a methodological basis for the mathematical simulation of its dynamics. In the theory of physical protection of OM without the formation of humic substances with the physical fractionation methodolody, the main focus is on the functional parameters of the OM components separated by their mineralization rates. Here, two conceptual disadvantages are noted: (a) neglect of the specificity of OM transformation in organic soil horizons, where humified OM resistant to mineralization is formed, which cannot be explained by this theory; and (b) consideration of the soil microorganisms as a unified undifferentiated complex. In classical humification theory, a number of humification stages are considered with the respective communities of decomposer organisms that mineralize OM and transform biota products into humic substances. The silvicultural concept of humus forms was found to be effective and suitable for a wide range of natural conditions with the use of this theory for OM simulation. There is a general shortcoming to both approaches: protection theory has no parameters of recalcitrant OM formation from other fractions; in humification theory, the quantitative humification parameters under the effect of soil fauna have yet to be sufficiently substantiated. The values of the turnover time for active, intermediate, and recalcitrant OM are revised. The importance of theoretically substantiating the structural and functional organization of OM for its dynamic modelling is emphasized.» weiterlesen» einklappen

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DDC Sachgruppe:
Geowissenschaften