| An investigation was conducted on the ectomycorrhizal resources and their ecological characteristics for the major forested areas in Daqingshan Mountain, Inner Mongolia. The results obtained using either the fruit body identification in the field or cultural inoculation in the laboratory suggested that there were 163 species of ectomycorrhizal fungi in Daqingshan Mountain. These 163 species, approximately comprising 26.6% of all the ectomycorrhizal species reported in China, belong to 18 families and 41 genera, In this survey, 54 species were the first time reported for this region, and 5 species were not identifiable at the species-level. These ectomycorrhizal fungi predominantly grow in the soil rich in organic matter, forest canopy closure of 0.7 - 0.9, altitude of 1300 ~ 1900m, and in the north-facing slope of 20° - 40° inclination. Analysis of the soil physical and chemical properties indicated that the existence of ecomycorrhizal fungi significantly lowered soil pH, and enhanced the total N content, but had no significant effect on the soil total P and K contents. By contrast, the existence of ectomycorrhizal fungi significantly increased the availability of labile N, P and K. Additional analysis showed that (1) the host tree species for Tricholomataceae, Russulaceae, Cortinariaceae and Amanitaceae were Betula platyphylla Suks., Populus davidiana Dode., Picea asperata Mast., Quercus mongolica (Fisch.)Turcz. and Ostryopsis davidiana Decne.; (2) the host tree species for Boletaceae mainly were Pinus tabulaeformis Cam, Larix principis-rupprechtii Mayr., Picea asperata Mast., Betula platyphylla Suks. and Ostryopsis davidiana Decne..More than 30 native fungi species were obtained by tissue isolation, among them, 15 were studied on their cultural characteristics (orthogonal experiments between medium and pH, carbon sources and...
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