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1.
Sci Total Environ ; 657: 351-364, 2019 Mar 20.
Artigo em Inglês | MEDLINE | ID: mdl-30550900

RESUMO

Landslides are common in high-latitude forest ecosystems that have developed on permafrost. The most vulnerable areas in the permafrost territories of Siberia occur on the south-facing slopes of northern rivers, where they are observed on about 20% of the total area of river slopes. Landslide disturbances will likely increase with climate change especially due to increasing summer-autumn precipitation. These processes are the most destructive natural disturbance agent and lead to the complete removal of pre-slide forest ecosystems (vegetation cover and soil). To evaluate postsliding ecosystem succession, we undertook integrated ecological research at landslides of different age classes along the Nizhnyaya Tunguska River and the Kochechum River (Tura, Krasnoyarsk region, Russia). Just after the event (at the one-year-old site), we registered a drop in soil respiration, a threefold lower microbial respiration rate, and a fourfold smaller mineral soil carbon and nitrogen stock at bare soil (melkozem) plots at the middle location of the site as compared with the non-affected control site. The recovery of disturbed areas began with the re-establishment of plant cover and the following accumulation of an organic soil layer. During the 35-year succession (L1972), the accumulated layer (O-layer) at the oldest site contained similar C- and N stocks to those found at the control sites. However, the mineral soil C- and N stocks and the microbial biomass - even of the oldest landslide area - did not reach the value of these parameters in control plots. Later, the soil respiration level and the eco-physiological status of soil microbiota also recovered due to these changes. This study demonstrates that the recovery after landslides in permafrost forests takes several decades. In addition, the degradation of permafrost due to landslides clearly hinders the accumulation of soil organic matter in the mineral soil.


Assuntos
Poluentes Atmosféricos/análise , Dióxido de Carbono/análise , Sequestro de Carbono , Deslizamentos de Terra , Pergelissolo , Solo/química , Carbono/metabolismo , Sibéria
2.
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
3.
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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