Abstract:Chestnut is an important cash special olcal product in Beijing which is exported to many foreign countries.The tree were grown along Yanshan mountain where the soil fertility is very poor because the farmer do not apply fertilizer.Therefore ectomycorrhizal fungi may play important role to the growth of the tree.In orde r to understand the improvement of phosphorus status in plant by inoculating wit h ectomycorrhizal fungi and the phosphorus transferring between chestnut seedlin gs via hyphal link,a four ...