Abstract: In order to understand the the effects of ectomycorrhizal fungi on the growth and phosphorus nutrition status of chestnut seedlings，experiment using three-compartment mesh boxes were carried out under controlled conditions．Two chestnut seedlings were transplan ted in the central compartment and inoculated with two ectomycorrhizal fungi Boletus edulis or Suillus luteus or not inoculated. The result showed that the contribution of extmradical mycellium to the total uptake of P in plant were 39％-54％ in Boletus edulis and 15％-35％ in Suillus luteus . Comparing with noninoculated treatment，inoculating with both fungi decreased Olsen-P and pH of soil in hyphae compartment．which indicates that both fungi aIe able to mobilize phosphates that are seareely-soluble and low availability in the soil．It is concluded that both ectomycorrhizal fungi play crucial role for P nutrition and the growth of chestnut．

Key words: Chestnut, Ectomycorrhizal fungi, P