Abstract: Studies on total soil fungi and abundance and distribution of Trichoderma in different vegetation soils of Yunnan show that relative amount of Trichoderma in forest soil occupies 3～15% of total fungal propagules, and varies with different sites, seasons and soil layers.Dominant species varies with different forest types. T. hamatum is widely distributed in all vegetation soils, especially in tropic rain forest soil. T. harzianum and T. aureoviride are frequently found in monsoon and semi-humid evergreen broad-leaved forest soils, respectively.

Key words: Trichoderma, Yunnan forest soils, Distribution and abundance, forest litterfall, model, climatic factor, geostatistics, spatial pattern, remote sensing