Abstract: Successive plantation of Chinese fir (Cunninghamia lanceolata) leads an obvious decline of soil fertility. To solve the urgent problem,five fungal species (F₂,F₃,F₄,F₇,F₁₅ ) which can effectively degrade phenolic acid were screened to degrade the toxic material in successive plantation site and to improve the soil bioactivity.Pot experiment showed that all test fungus,except F₄,could improve plant growth individually,but not counteract the effect of phenolic acid.Inoculating five inoculated fungi mixed with equal proportion not only counteracted the inhibitory effect of phenolic acid but also improved the growth of Chinese fir uninoculated with VAM fungi but inoculated with G.mosseae.

Key words: Cunninghamia lanceolata, Decline of soil fertility, Soil toxicosis, Phenolic acid degradation fungus, stormwater runoff, green ecological measure., stormwater management model (SWMM), snowmelt runoff, low impact development (LID), peak flow