Soluble phenolics’ dynamics during litter decomposition in a montane Common beech forest ecosystem

Abstract

Secondary metabolites have a specific role in the organic matter and nutrient cycling in forest ecosystems, especially in the process of litter decomposition. Decomposition of Common beech (Fagus sylvatica L.) leaf, branch, and acorn litter was followed by litter-bag experiments in the Common beech ecosystem Calamintho grandiflorae-Fagetum in Mavrovo National Park (Macedonia) for almost 7 years. The main goal of the present study was to analyze the dynamics of soluble phenolic compounds during litter decomposition. We analyzed total phenolics, flavonoids and anthocyanins content in the course of the decomposition of leaves, branches and acorns. The concentration of total phenolics, flavonoids and anthocyanins in leaves decreased following a simple exponential model. All of these compounds followed a 3-step dynamics in branch and acorn litter. The decrease in absolute mass of all compounds in all three litter fractions was described by simple exponential or logarithmic models. Total phenolics, flavonoids and anthocyanins were found in low concentrations. These low concentration point out to a new hypothesis, yet to be proved, that the phenolics do not slow down the decomposition process and contribute to the low limit value for this forest ecosystem.