In the present study , a compartment cultivation system and histochemical staining were used to investigate the influence of soil available p level , plant p status and soil organic p on the growth and metabolic activity of am fungi . differences in metabolic activity among am fungal isolates and the relationship between metabolic activity and mycorrhizal effectiveness were al so investigated . in addition , am fungi from a wide range of environmental conditions ( originally isolated from north , central and south china ) were used to study the ecological adaptability of am fungi and the influence of edaphic conditions on am fungal growth and metabolic activity 本研究采用分室根箱、组织化学等手段研究了土壤施磷水平、植物磷营养状况、土壤有机磷对am真菌生长和代谢活性的影响；不同am真菌的代谢活性及其与菌根效应之间的关系，并对我国华北、华中和华南地区筛选出的高效菌株进行了生态适应性的比较，以期在理论上阐述宿主植物生长状况及土壤条件对菌根真菌生长和代谢活性的调控机制，筛选出具有广泛生态适应性的am菌株。
