MOBILIZATION AND UTILIZATION OF SPARINGLY SOLUBLE PHOSPHATES BY VA MYCORRHIZAL FUNGUS EXTERNAL HYPHAE Ⅰ? ? ~(32)P INDIRECTLY LABELLING Selection research of VA mycorrhizal fungus and plant Effect of inoculating ectomycorrbizal fungus on Acacia confusa and Pinus massoniuna seedlings EFFECTS OF VA MYCORRHIZAL FUNGUS ON PHOSPHORUS AND POTASSIUM UPTAKE IN TEA SEEDLINGS Study on Mycorrhizal Physiology of Eucalyptus urophylla Coinoculated with ECM and VAM Fungi