Fungal populations from forest soils in southern Quebec

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Abstract
The fungal populations of four forest soils in southern Quebec were studied, using the soil-washing technique. Although the four forests were located on the same basal materials, the effects of planting different tree species were reflected by changes in the chemical properties of the soils. Of the fungi isolated from these soils, Gliocladium roseum, Paecilomyces carneus, P. fumosoroseus, Gliomastix murorum, Penicillium implication, P. spinulosum, P. thomii, Trichoderma hamatum, and two unidentified Trichoderma species preferred the more neutral, deciduous forest soils. However, Chrysosporium pannorum, Penicillium janthinellum, P. simplicissimum, Trichoderma viride, T. polysporum, and another unidentified Trichoderma preferred the more acidic coniferous forest soils. For other species of fungi no differences between populations in the four sites could be detected. It is concluded that a clearer understanding of the ecology of these fungi requires a more detailed analysis of the influence of seasonal and spatial changes in their physical and chemical environment on their population densities.