Abstract: After inoculated with vesicular-arbuscular mycorrhizal fungus(VAMF),the growth of R. pseudoacacia,its infection ability and spore number are varied with soil condition and phosphorus application rate. In a pot experiment applicated with P, the host plant biomass and infection rate are higher when the total Pcontent in soil is 0.073%, but decreased markedly,when the Pcontent is up to 0.08%. More spores are found at 4-6cm depth of rhizosphere soil when the soil total Pcontent is 0.076%. In an inoculated drab soil, the infection rate of seedlings at 3 months old is 65.8%, but their biomass is not significantly increased. After forestation with inoculated seedlings on an infertile hilly land, the biomass of host plant at 5 months old is increased by 17.6%.

Key words: Robinia pseudoacacia, Vesicular-arbuscular mycorrhizal fungus, Inoculation test, Environmental effect