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[Diversity and niche of soil moniliaceous hyphomycetes in Taibai Mountain].

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 moniliaceous hyphomycetes in different forest types on the southern and northern slopes of Taibai Mountain. The results showed that the distribution of soil moniliaceous hyphomycetes on the study area had an obvious environmental gradient pattern. Altitude and forest type were the main determinants of the fungal community distribution. The species richness and diversity index of soil moniliaceous hyphomycetes decreased significantly with increasing altitude, but the community evenness represented an increasing trend. Among the genera of soil moniliaceous hyphomycetes, Penicillium, Aspergillus, Verticillium, Paecilomyces and Acremonium had larger niche width and greater niche overlap with other genera, suggeting that these genera had wide distribution on the southern and northern slopes of Taibai Mountain. As for Trichothecium, Gliocladium and Metarhizium, their niche width was narrower, and their niche overlap with other genera was smaller, indicating that the distribution of these genera was more affected by altitude and vegetation, with the occurrence only in special forest types.