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Abstract
The occurrence of vesicular arbuscular mycorrhizae was reconfirmed in Oryzopsis hymenoides, a major graminoid species on western sand dunes. A bioassay was used to determine the ability of soil from O. hymenoides stands to support formation of vesicular arbuscular mycorrhizae. Regression analyses of the bioassay results were used to predict the relationship between mycorrhiza formation and differences in surrounding vegetation and differences in initial soil depth, soil water content, and soil pH. There was a strong positive correlation between mycorrhiza formation and the amount of above ground plant cover. There was a strong negative correlation between mycorrhiza formation and increases in initial soil depth, moisture, and pH.