Abstract: Sixteen genera of soil moniliaceous hyphomycetes were isolated from 40 soil samples collected from the southern and northern slopes of Taibai Mountain , and the indices Shannon-Wiener diversity index, evenness, niche breadth, and niche overlap were used to analyze the community structure and niche of soil mon iliaceous hyphomycetes in different forest types on the southern and northern sl opes of Taibai Mountain. The results showed that the distribution of soil monili aceous hyphomycetes on the study area had an obvious environmental gradient patt ern. Altitude and forest type were the main determinants of the fungal community distribution. The species richness and diversity index of soil moniliaceous hyp homycetes decreased significantly with increasing altitude, but the community ev enness represented an increasing trend. Among the genera of soil moniliaceous hy phomycetes, Penicillium, Aspergillus, Verticillium, Paecilomyces and Acrem onium had larger niche width and greater niche overlap with other genera, sugg eting that these genera had wide distribution on the southern and northern slope s of Taibai Mountain. As for Trichothecium, Gliocladium and Metarhizium, their niche width was narrower, and their niche overlap with other genera was s maller, indicating that the distribution of these genera was more affected by al titude and vegetation, with the occurrence only in special forest types.

Key words: platinum group elements (PGEs), anthropogenic emission, distribution, toxicity, migration, environmental risk.