Fungal biomass and extracellular enzyme activities in coarse woody debris of 13 tree species in the early phase of decomposition

Abstract Decomposition rates of coarse woody debris(CWD) have been investigated in many studies, however data on fungal biomass and the related enzymatic activities in decomposing CWD are scarce. Here, we investigated the relations between fungal biomass, enzyme activitiesand CWD properties in sap- and heartwood of decomposing logs of 13 different temperate European tree species, exposed for 6 years on the ground. Fungal biomass was significantly higher in sapwood than in heartwood and higher in deciduousthan in coniferous species, and represented 0.3–4.4% of CWD dry mass. In deciduoussapwood, fungal biomass may represent up to 29% of the total N stock in CWD. Fungal biomass correlated positively with the N content of CWD and, in heartwood, negatively with extractives. Enzyme activitieswere higher in deciduousthan in coniferous CWD and for hydrolases higher in sapwood than in heartwood. Correlations between enzyme activitiesand the ergosterolcontent were generally weak. Hydrolytic enzymes were frequently found in all decaying tree species, whereas ligninolytic oxidoreductases showed high variability specifically in deciduouswood. Fungal biomass and enzymatic activities confirm the assumption that, in the initial stage, the decomposition of deciduousCWD is faster than of coniferous CWD under comparable conditions.