УГЛЕРОД МИКРОБНОЙ БИОМАССЫ В ПРОФИЛЕ МЕРЗЛОТНЫХ ПОЧВ ЮГА ВИТИМСКОГО ПЛОСКОГОРЬЯ

Abstract

The cryogenic nature of soils undoubtedly affects the carbon content of microbial biomass. Global climate warming has led to a highly dissected relief in the form of heave mounds and thermokarst depressions, where the first reaction of landscapes to changing environmental conditions is the response of biota. The objects of our research are permafrost soils, brown soils and quasi-clay chernozems. The aim of the work was to determine the carbon of microbial biomass in soils with a dissected relief of the south of the Vitim plateau. We found a strong direct correlation between the carbon content of humus and carbon of microbial biomass in the studied soils. The correlation between the content of C-biomass and soil moisture in the forest cenosis is also noteworthy, here the relationship was (r=0.91) in the humus pocket and less close (r=0.69) in the host horizon. Comparing the carbon content of microbial biomass from frost-breaking cracks (humus pocket) in the soil from the same depths of the host horizon, it should be noted that the entry into the soil of significant amounts of organic matter with plant litter stimulates the soil microflora and even in the lower horizon there is a fairly high content of C-biomass. The indicators of microbial biomass and humus in frost cracks are higher. The obtained data characterize the direction and intensity of microbiological processes along the profile horizons. Such studies in agroecosystems are necessary to assess the influence of natural and anthropogenic factors on the soil microbial complex.