Seasonal changes in the transformation and transportation of uracyl, glycine, and glucose in soils of podzolic type

Abstract

The behavior of water-soluble organic compounds arriving in forest litter significantly varies between the warm and cold seasons. Their rapid mineralization occurs in the summer: the removal of introduced compounds from the forest litter and their inclusion into humus substances are almost absent. At the input of water-soluble organic compounds to forest litter during the cold period, the mineralization processes decrease; they recommence only in the next warm period. However, the initial compounds have undergone some transformations by this time, which significantly increases their microbiological stability and decreases their migration capacity. The labeled compounds introduced in the fall are fixed within the forest litter and predominantly enter into the microbial and fungal biomass. Transformed labeled compounds enter into the humus-accumulative A1 horizon due to migration followed by their inclusion into the mineral-humus component of this horizon. Assessing the role of migration in the development of the humus-accumulative horizon in podzolic soils shows the secondary role of migration processes. The major role is played by the formation of the humus-accumulative horizon in accordance with the classical concepts of the soddy process.