Abstract: Phanerochatet chrysosporium was liquid cultured with avicel as carbon source and with veratric alcohol as enzyme inducing agent.Determinations of its lignin peroxidase activity at different initial pH values showed that the highest enzyme activity was obtained at pH 6.0, indicating that the optimum pHvalue was relatively higher when avicel was used to substitute glucose as a carbon source.The enzyme activity had a positive relationship with the diameter of hyphal pellet.

Key words: Phanerochaete chrysosporium, Avicel, Lignin peroxidase, pH valuei, natural evergreen broad-leaved forest, microbial biomass nitrogen, nitrogen deposition, microbial biomass carbon