, Volume 36, Issue 1-3, pp 31-38

Microflora of a coniferous forest of the Mexican basin

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Soil profiles were made at three locations corresponding to the three principal coniferous groups:Pinus montezumae, Abies religiosa andPinus hartwegii. The soil samples were submitted to microbiological, physical and chemical analysis. Mycorrhizic fungi were collected throughout this zone and 25 species of ectotrophic and 1 facultative mycorrhizic fungiLaccaria laccata were found.Lycoperdon perlatum andHygrophorus chrysodon were in the three communities, as wellAmanita muscaria, Boletus granulatus andCantharellus cibarius were only in the Pinus communities. The experimental condition used in order to prove symbiosis showed us several symbionts in the root for each one of the three different conifers. As regards general microflora, the greatest number of bacteria and fungi was present in the surface horizon of Abies soil; these soils are deep and moist throughout the year and with a good drainage, so that seasonal variations have little or no effect on soil environmental conditions and that favors the microbiological development. In the soils of the Pinus communities the number of actinomycetes and of bacteria is higher immediately below the surface horizon.