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Mycorrhizal fungi has showed a closely relationship with litter decomposition, nutrient release and uptake, and transfer of plant across an entire system.In this study, the effects of the ectomycorrhizal fungus Suillus grevilleion litter decomposition and phosphorus (P) nutrition of Pinus koraiensis seedlings were studied.One-year-old seedlings grown under three different P nutrition levels with and without P.grevillei inoculation and with and without leaf litter.The results showed that (1) the infection rate of S.grevillei on P.koraiensis was the highest under moderate P stress.Seedlings that formed mycorrhizae were significantly heavier than those without mycorrhiza under the same nutritional conditions.The infection rate was positively correlated with dry biomass of seedling.(2) The ectomycorrhizal fungus promoted litter decomposition, and the presence of litter promoted the development of ectomycorrhizae between S.grevillei and P.koraiensis.Significantly more P was released from litter with ectomycorrhizae than without, suggesting that ectomycorrhizal hyphae can transfer P released by litter to the plant.(3) The content of P in mycorrhizal rhizosphere soil was significantly higher than in rhizosphere soil without mycorrhizae.Mycorrhizal fungi may convert P stored in the matrix into a form available to plants, increasing the P content in the ecosystem P cycle, and absorbing P to generate more mycelia in the plant rhizosphere soil.