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1.
Izv Akad Nauk Ser Biol ; (1): 76-85, 2014.
Artigo em Russo | MEDLINE | ID: mdl-25735159

RESUMO

Based on the results of long-term investigations, quantitative assessment ofphytodetrite mineralization rates is provided. Their role in the biological cycle of larch stands growing in the permafrost zone of Central Evenkia is discussed. It is demonstrated that their destruction in the subshrub-sphagnum and cowberry-green moss larch stands is extremely slow, the plant litter contains the most cecalcitrant organic matter demonstrating the lowest decomposition coefficient of 0.03-0.04 year(-1), whereas fresh components of the plant litter have 3- to 4-fold higher values. An insignificant input of N and C from the analyzed mortmass to the soil has been registered. It has been revealed that the changes in N and C in the decomposition components are closely related to the quantitative dynamics (biomass) of microorganisms, such as hydrolytics and, especially, micromicetes.


Assuntos
Ecossistema , Florestas , Pergelissolo/microbiologia , Biomassa , Larix/química , Larix/metabolismo , Folhas de Planta/metabolismo , Folhas de Planta/microbiologia , Sibéria , Solo/química , Sphagnopsida/metabolismo
2.
Izv Akad Nauk Ser Biol ; (2): 227-34, 2011.
Artigo em Russo | MEDLINE | ID: mdl-21506397

RESUMO

The role of ground fires in transformation of organic substances in the ground cover of larch stands in the permafrost zone of Central Siberia was studied, as was the postfire restoration dynamics of organic substances. Ground fires lead to a considerable decrease in concentrations and resources of organic carbon and its individual fractions in the ground cover, and restoration takes many decades.


Assuntos
Carbono/análise , Conservação dos Recursos Naturais , Incêndios , Agricultura Florestal , Larix/crescimento & desenvolvimento , Solo/normas , Biomassa , Ecologia , Substâncias Húmicas/análise , Sibéria , Solo/análise
3.
Izv Akad Nauk Ser Biol ; (1): 95-104, 2010.
Artigo em Russo | MEDLINE | ID: mdl-20238469

RESUMO

The impact of solifluction (soil-sliding) on soil and vegetation cover as well as their restoration during the period after the disturbance was analyzed in the continuous permafrost region of Central Siberia (Central Evenkia). The role of vegetation invading after a disturbance is demonstrated for accumulation of biogenic elements and soil development.


Assuntos
Ecossistema , Desenvolvimento Vegetal , Solo , Regiões Árticas , Plantas/metabolismo , Sibéria
4.
Izv Akad Nauk Ser Biol ; (1): 49-58, 2004.
Artigo em Russo | MEDLINE | ID: mdl-15049069

RESUMO

It is shown that larch of the prefire generation is the main edificator at the early stages of restorative successions in burned-out areas. Its environment-forming effect manifests itself most strongly in the phytogenic field of living trees, where edaphic conditions similar to those in primary larch forests are formed within ten years after the fire. This is accompanied by an increase in the numbers of microorganisms utilizing organic and mineral nitrogen, as well as in the rate of nitrogen mineralization in plant microgroups of this zone. Hence, living trees remaining in a burned-out area promote restoration of the initial edaphic conditions.


Assuntos
Incêndios , Larix/fisiologia , Árvores , Ecologia , Meio Ambiente , Nitrogênio/metabolismo , Sibéria
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