Effects of tree species, stand age and soil type on soil microbial biomass and its activity in a southern boreal forest

abies balsamea age arbre forestier bacteria betula betula papyrifera biomasa biomass biomasse boreal forests champignon du sol coniferales edad especies flora del suelo flore du sol forest soils forest trees hongos del suelo microorganisme microorganismos microorganisms picea glauca pinopsida populus tremuloides soil soil flora soil fungi soil types sol species stand characteristics stand structure suelo suelo forestal tipos de suelos type de sol