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Ecological variations of Arbuscular mycorrhizal (AM) fungi were determined from the soils collected from different sites of the polluted and unpolluted areas related to the soil pollutions. Average 24.5 spores (per 20 g)^(-1) loll of AM fungal spore were counted from the 32 sites of soils collected from On-san (polluted), whereas average 4.1 spores (per 20 g)^(-1) soil from the 18 sites of those from Mt. Kwanak (polluted), Average 23.6 spores (per 20 g)^(-1) soil of AM fungal spore were also counted from the 30 sites of soils collected from Chung-mu (unpolluted), whereas average 15.8 spores (per 20 g)^(-1) soil from the 14 sites of those from Mt. Chungwang (unpolluted). The spores of AM fungi were the species of Glomus, Gigaspora, Acaulospora and Scutellospora. Amoug the above four genera, the species of Glomus were observed to be more abundant than the other genera in the soils collected from On-san, Chung-mu and Mt. Chungwang whereas the species of Gigaspora in those from Mt. Kwan-ak. The parameters of soils measured showed some variations between the polluted and unpolluted areas; 12.9 to 16.4% in the soil moisture, 5.6 to 8.3% in the organic matter and 4.3 to 5.7 at soil pH (polluted to unpolluted areas, respectively). The soils collected, thereby, appeared to be more strongly acidic and also lower in the contents of soil moisture or organic matter at the polluted area than unpolluted area. Based on the ecological criteria, the species richness or species diversity had significant differences (p$lt;0.05) between polluted and unpolluted area. The spore density of genus Glomus or Gigaspora was significantly different (p$lt;0.05) among the soils of three different plant vegetations (conifer plants, broad leaf plants, and grass plants). Also, there were significant differences (p$lt;0.05) in the species evenness or species diversity among the soils referring to three different plant vegetations. There was a direct relationship (r²=0.38) between soil moisture and organic matter measured from 94 soil samples. Since there was a direct (relationship (r²=0.22) between organic matter and total spores, it seems to be likely to presume that mycorrbizel spores can be increased in proportion to enhanced organic matters in soils. The species richness or species diversity was inclined to increase in proportion to enhanced soil pH and total spores in soils.
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