Sizable carbon emission from the floodplain of Ob River

The Ob River floodplain is the second largest floodplain in the world. Despite its vast area, estimates of carbon (C) emissions from the Ob River floodplain are largely absent. Here we present seasonal C emission and water area extent from the main channel and the floodplain along a ~4 km reach in t...

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Autores principales:	Ivan V. Krickov, Svetlana Serikova, Oleg S. Pokrovsky, Sergey N. Vorobyev, Artem G. Lim, Matthias B. Siewert, Jan Karlsson
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Floodplain Greenhouse gases Ob river Seasonal influences Carbon emission Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/10f3c3374da8481d951da67e81f674d7
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id	oai:doaj.org-article:10f3c3374da8481d951da67e81f674d7
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spelling	oai:doaj.org-article:10f3c3374da8481d951da67e81f674d72021-12-01T04:59:52ZSizable carbon emission from the floodplain of Ob River1470-160X10.1016/j.ecolind.2021.108164https://doaj.org/article/10f3c3374da8481d951da67e81f674d72021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21008293https://doaj.org/toc/1470-160XThe Ob River floodplain is the second largest floodplain in the world. Despite its vast area, estimates of carbon (C) emissions from the Ob River floodplain are largely absent. Here we present seasonal C emission and water area extent from the main channel and the floodplain along a ~4 km reach in the boreal zone of the Ob River. We found strong seasonality in water area extent of the Ob main channel (~1.8 km2) and floodplain (~3 km2) with water covering 34% of land during flood and subsequently declining to ~16% and ~14% during summer and autumn baseflow, respectively. The C emissions also varied seasonally over the open water period, ranging from −0.1 to 0.6 g C m−2 d−1 for the Ob main channel and from 0 to 9 g C m−2 d−1 for the floodplain. The dissolved organic carbon positively affected CO2 concentrations and fluxes in the floodplain during all seasons, whereas pH and oxygen concentration negatively impacted CO2 concentrations and fluxes. Some nutrients (ammonia and phosphate) positively correlated with CO2 and CH4 concentrations in summer. The total C emission from the study reach (1.8 km2 main channel, 3 km2 floodplain) during moderate flooding was 236 ± 51 tons C yr−1 (>99% CO2, <1% CH4) with the floodplain accounting for ~65%. The contribution of the floodplain to the net river C evasion may be even greater during years of high flooding and in northern regions of the Ob River basin, where floodplain soils are more C-rich and are underlain by permafrost, and in years with more extensive flooding.Ivan V. KrickovSvetlana SerikovaOleg S. PokrovskySergey N. VorobyevArtem G. LimMatthias B. SiewertJan KarlssonElsevierarticleFloodplainGreenhouse gasesOb riverSeasonal influencesCarbon emissionEcologyQH540-549.5ENEcological Indicators, Vol 131, Iss , Pp 108164- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Floodplain Greenhouse gases Ob river Seasonal influences Carbon emission Ecology QH540-549.5
spellingShingle	Floodplain Greenhouse gases Ob river Seasonal influences Carbon emission Ecology QH540-549.5 Ivan V. Krickov Svetlana Serikova Oleg S. Pokrovsky Sergey N. Vorobyev Artem G. Lim Matthias B. Siewert Jan Karlsson Sizable carbon emission from the floodplain of Ob River
description	The Ob River floodplain is the second largest floodplain in the world. Despite its vast area, estimates of carbon (C) emissions from the Ob River floodplain are largely absent. Here we present seasonal C emission and water area extent from the main channel and the floodplain along a ~4 km reach in the boreal zone of the Ob River. We found strong seasonality in water area extent of the Ob main channel (~1.8 km2) and floodplain (~3 km2) with water covering 34% of land during flood and subsequently declining to ~16% and ~14% during summer and autumn baseflow, respectively. The C emissions also varied seasonally over the open water period, ranging from −0.1 to 0.6 g C m−2 d−1 for the Ob main channel and from 0 to 9 g C m−2 d−1 for the floodplain. The dissolved organic carbon positively affected CO2 concentrations and fluxes in the floodplain during all seasons, whereas pH and oxygen concentration negatively impacted CO2 concentrations and fluxes. Some nutrients (ammonia and phosphate) positively correlated with CO2 and CH4 concentrations in summer. The total C emission from the study reach (1.8 km2 main channel, 3 km2 floodplain) during moderate flooding was 236 ± 51 tons C yr−1 (>99% CO2, <1% CH4) with the floodplain accounting for ~65%. The contribution of the floodplain to the net river C evasion may be even greater during years of high flooding and in northern regions of the Ob River basin, where floodplain soils are more C-rich and are underlain by permafrost, and in years with more extensive flooding.
format	article
author	Ivan V. Krickov Svetlana Serikova Oleg S. Pokrovsky Sergey N. Vorobyev Artem G. Lim Matthias B. Siewert Jan Karlsson
author_facet	Ivan V. Krickov Svetlana Serikova Oleg S. Pokrovsky Sergey N. Vorobyev Artem G. Lim Matthias B. Siewert Jan Karlsson
author_sort	Ivan V. Krickov
title	Sizable carbon emission from the floodplain of Ob River
title_short	Sizable carbon emission from the floodplain of Ob River
title_full	Sizable carbon emission from the floodplain of Ob River
title_fullStr	Sizable carbon emission from the floodplain of Ob River
title_full_unstemmed	Sizable carbon emission from the floodplain of Ob River
title_sort	sizable carbon emission from the floodplain of ob river
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/10f3c3374da8481d951da67e81f674d7
work_keys_str_mv	AT ivanvkrickov sizablecarbonemissionfromthefloodplainofobriver AT svetlanaserikova sizablecarbonemissionfromthefloodplainofobriver AT olegspokrovsky sizablecarbonemissionfromthefloodplainofobriver AT sergeynvorobyev sizablecarbonemissionfromthefloodplainofobriver AT artemglim sizablecarbonemissionfromthefloodplainofobriver AT matthiasbsiewert sizablecarbonemissionfromthefloodplainofobriver AT jankarlsson sizablecarbonemissionfromthefloodplainofobriver
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Sizable carbon emission from the floodplain of Ob River

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