Bogorodskaya A. V. Microbiological Assessment of Anthropogenically Disturbed Forest Ecosystems in Central Siberia
How to cite: Bogorodskaya A. V. Microbiological assessment of anthropogenically disturbed forest ecosystems in Central Siberia // Sibirskij Lesnoj Zurnal (Siberian Journal of Forest Science). 2016. N. 2: 71–84 (in Russian with English abstract).
© Bogorodskaya A. V., 2016
Universal indicators for early diagnosis of the condition and determine the critical limits of the balanced functioning of soils were the contents of microbial biomass, the intensity of the basal respiration and microbial metabolic quotient. Recorded time quantitative and structural-taxonomic restructuring of ecological trophic groups of microorganisms allowed detail to assess the state of soils of forest ecosystems, damaged by cutting, fires and anthropogenic influences. Structural and functional changes in the microbial soil complexes marked by only one-two years after cutting of coniferous forests. Status of microbial soil complexes reflected stages of plant succession after cutting. Indicative responses of soil microorganisms in the sustainable impact of aggressive pollutants tundra zone of the Norilsk industrial district were registered as at the functional and at the structural level. In areas of moderate and weak disturbances of vegetation were quantitative changes, whereas a strong disturbances and constant exposure to pollutants marked structural and taxonomic adjustment of microbial soil complexes, disturbed dynamic processes of synthesis-mineralization and reduced adaptive capacity saprophytic microorganisms as to the existence of low temperatures, and to the effects of pollutants. Postfire recovery of the microbial soil complexes was determined by fire severity and by the properties of soils and vegetation succession. Functional activity of microbial soil complexes was recovered one or two years after low-intensity fires, whereas after high-intensity fires – was not recovered until eight years. Successional development microorganisms of dumps of different ages defined as properties of soils, surface slope, and the development of vegetation. Reclamation of dumps with the application of topsoil accelerated the development of meadow vegetation and succession microbial complexes.