Agrogenesis: manifestations in the physical state of the arable chernozems in the area between Prut and Dniester

Increasing the pressure of techno-anthropogenic factors on arable chernozems, in conditions of intensification of the degree of continentality of the soil climate induced by climate change, against the background of unidirectional reduction of the role of the biological factor in the anthropo-natural chernozem pedogenesis, involved a newphase in its evolution in which the decisive role belongs to physical degradation. It is distinguished by significant changes in typogenetic chernozeomic processes: a) formation and accumulation of humus; b) aggregation-structuring of the soil mass. Within the complex process of decomposition-transformation of fresh organic matter, the weight of the humus formation and accumulation process is reduced and the weight of the mineralization process is increased. Biocoagulation processes of aggregation-structuring of the soil mass is significantly reduced. Instead, it increases the share of thermocompression and physical-mechanical processes in the evolution of the aggregate system of arable chernozems. This leads to the disruption of the functionality of the pedofunctional system humic system ↔ aggregatesystem manifested in the reduction of the meaning and intensity of the reproductive processes of chernozemous pedogenesis and the natural fertility of arable chernozems. In the current phase of chernoziomic pedogenesis, anthropo-natural agrogenesis manifests itself in the attenuation of differences at the subtype taxonomic level.