An experimental assessment of the availability and mineralization rate of organic matter of sediments in water bodies of permafrost ecosystems | Научно-инновационный портал СФУ

An experimental assessment of the availability and mineralization rate of organic matter of sediments in water bodies of permafrost ecosystems

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: 20th International Multidisciplinary Scientific Geoconference: Water Resources, Forest, Marine and Ocean Ecosystems, SGEM 2020

Год издания: 2020

Идентификатор DOI: 10.5593/sgem2020/3.1/s12.001

Ключевые слова: c-ch413c-ch4, incubation experiments, methane, permafrost lakes, sediments

Аннотация: Water ecosystems of Arctic region are most vulnerable to modern climatic changes, since global biogeochemical processes mostly occur on territories of permafrost zone. This work gives new insights into fundamental research question of how fast organic matter of thawing permafrost can be converted to greenhouse gases which are emitted into the atmosphere (for example, CH4). We aimed to identify microbial response and associated release of CH4 from Arctic lakes in response to temperature increase. We investigated lakes located in the Lena River delta on the Samoylov Island, Russia, at 72°22’N, 126°28’E. Bottom sediments from three thermokarst and three oxbow lakes were anaerobically incubated in laboratory at two temperature regimes (at 4 °C and at 25 °C). We identified different metabolic pathways of methane formation in thermokarst and oxbow lakes using the analysis of carbon isotopic composition in methane during the incubation period. Temperature increase caused methane emission from sediments of all of the lake types to rise. Our results suggest that in case of the global warming both thermokarst and oxbow lakes could become a great source of methane into the atmosphere. © 2020 International Multidisciplinary Scientific Geoconference. All rights reserved.

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Издание

Журнал: International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM

Выпуск журнала: Vol. 2020-August, Is. 3.1

Номера страниц: 3-10

ISSN журнала: 13142704

Издатель: International Multidisciplinary Scientific Geoconference

Авторы

  • Alekseeva N. (Arctic and Antarctic Research Institute, Russian Federation, Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Russian Federation)
  • Evgrafova S. (Sukachev Institute of Forest SB RAS, Federal Research Center, Krasnoyarsk Science Center SB RAS, Russian Federation, Siberian Federal University, Russian Federation)
  • Detsura A. (Siberian Federal University, Russian Federation)
  • Guzeva A. (Saint-Petersburg State University, Russian Federation, Institute of limnology RAS, Russian Federation)
  • Fedorova I. (Saint-Petersburg State University, Russian Federation)

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