Effects of dirt treatments on the enzyme activities of the soil in Sikfokut site

The soil organic matter is affected among others by the quality of litter input i.e. the kind of litter material that is deposited on soil surface. Leaf, root and wood litter addition were applied and the effect of these treatments on soil enzymes activities (polyphenoloxidase, saccharase and phosphatase). The rapidly decomposing leaf and root litter had a great influence on enzyme activities. First the decomposition of fine roots affected in the case of polyphenoloxidase and phosphatase activity. The investigations of phenoloxidase and phosphatase which were carried out right after the establishment of parcels, showed absolutely higher values in soil samples of NI and NR treatments in the first years. Then the leaf litter decomposition was the most important influencing factor. Later these values decreased and was exceeded by the DL (Double Litter), C (Control), DW (Double Wood) treatments, in which surface leaf-litter was added to the soil. The wood litter decomposition did not affect the polyphenoloxidase activity substantially during the experimental period. The phosphatase activity showed the same tendency as polyphenoloxidase, but wood litter played a greater role in phosphatase activity, and the activity declined rapidly in the case of root treatments. The examination of the saccharase activity was launched three and a half years after the establishment of the plots; thus having enough time for the development of the different ecological conditions at our disposal. Significant differences were detectable between the treatments in the case of saccharase and phosphatase.