Abstract: The paper reports the changes in carbohydrates contained in organic matter of soil in decomposition process of forest litters under laboratory conditions for 730 days. The results show that carbohydrates belonging to humus, existed in soil partiapate in decomposition and have been renewed, besides part of the organic remainders to be decomposed in this process. The amount of decomposition and renew deponds on the component of litters. Secondly, when the organic remainders decompose towards humification, the percentage of fucose, ribose, rhamnose and galactose orginated from microbe in humus fraction is higher than that in non-humus fraction, where as the percentage of xylose and arabinose originated from plants in humus lower than that in non-humus.

Key words: Decomposition of forest litter, Carbohydrates