Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland
Turbic Cryosols (permafrost soils characterized by cryoturbation, i.e., by mixing of soil layers due to freezing and thawing) are widespread across the Arctic, and contain large amounts of poorly decomposed organic material buried in the subsoil. This cryoturbated organic matter exhibits retarded de...
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Amsterdam : Elsevier
2013
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ftdatacite:10.15488/1403 2023-05-15T14:56:52+02:00 Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland Wild, Birgit Schnecker, Jörg Bárta, Jiri Čapek, Petr Guggenberger, Georg Hofhansl, Florian Kaiser, Christina Lashchinskiy, Nikolay Mikutta, Robert Mooshammer, Maria Šantrůčková, Hana Shibistova, Olga Urich, Tim Zimov, Sergey A. Richter, Andreas 2013 https://dx.doi.org/10.15488/1403 http://www.repo.uni-hannover.de/handle/123456789/1428 en eng Amsterdam : Elsevier CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 CC-BY Arctic Cryoturbation Ecological stoichiometry Nitrification Nitrogen availability Nitrogen mineralization Nitrogen transformation Protein depolymerization Soil organic matter Tundra Nitrogen transformations Soil organic matters Amino acids Biogeochemistry Decay organic Depolymerization Mineralogy Nitrogen Organic compounds Permafrost Proteins Soils arctic environment cryoturbation decomposition freezing microbial community mineralization nitrification nitrogen nitrogen cycle permafrost protein soil horizon soil organic matter stoichiometry subsoil thawing transformation tundra Greenland Siberia Dewey Decimal Classification500 | Naturwissenschaften570 | Biowissenschaften, Biologie Other CreativeWork article 2013 ftdatacite https://doi.org/10.15488/1403 2021-11-05T12:55:41Z Turbic Cryosols (permafrost soils characterized by cryoturbation, i.e., by mixing of soil layers due to freezing and thawing) are widespread across the Arctic, and contain large amounts of poorly decomposed organic material buried in the subsoil. This cryoturbated organic matter exhibits retarded decomposition compared to organic material in the topsoil. Since soil organic matter (SOM) decomposition is known to be tightly linked to N availability, we investigated N transformation rates in different soil horizons of three tundra sites in north-eastern Siberia and Greenland. We measured gross rates of protein depolymerization, N mineralization (ammonification) and nitrification, as well as microbial uptake of amino acids and NH4 + using an array of 15N pool dilution approaches. We found that all sites and horizons were characterized by low N availability, as indicated by low N mineralization compared to protein depolymerization rates (with gross N mineralization accounting on average for 14% of gross protein depolymerization). The proportion of organic N mineralized was significantly higher at the Greenland than at the Siberian sites, suggesting differences in N limitation. The proportion of organic N mineralized, however, did not differ significantly between soil horizons, pointing to a similar N demand of the microbial community of each horizon. In contrast, absolute N transformation rates were significantly lower in cryoturbated than in organic horizons, with cryoturbated horizons reaching not more than 32% of the transformation rates in organic horizons. Our results thus indicate a deceleration of the entire N cycle in cryoturbated soil horizons, especially strongly reduced rates of protein depolymerization (16% of organic horizons) which is considered the rate-limiting step in soil N cycling. Article in Journal/Newspaper Arctic Greenland permafrost Tundra Siberia DataCite Metadata Store (German National Library of Science and Technology) Arctic Dewey ENVELOPE(-64.320,-64.320,-65.907,-65.907) Greenland |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Arctic Cryoturbation Ecological stoichiometry Nitrification Nitrogen availability Nitrogen mineralization Nitrogen transformation Protein depolymerization Soil organic matter Tundra Nitrogen transformations Soil organic matters Amino acids Biogeochemistry Decay organic Depolymerization Mineralogy Nitrogen Organic compounds Permafrost Proteins Soils arctic environment cryoturbation decomposition freezing microbial community mineralization nitrification nitrogen nitrogen cycle permafrost protein soil horizon soil organic matter stoichiometry subsoil thawing transformation tundra Greenland Siberia Dewey Decimal Classification500 | Naturwissenschaften570 | Biowissenschaften, Biologie |
spellingShingle |
Arctic Cryoturbation Ecological stoichiometry Nitrification Nitrogen availability Nitrogen mineralization Nitrogen transformation Protein depolymerization Soil organic matter Tundra Nitrogen transformations Soil organic matters Amino acids Biogeochemistry Decay organic Depolymerization Mineralogy Nitrogen Organic compounds Permafrost Proteins Soils arctic environment cryoturbation decomposition freezing microbial community mineralization nitrification nitrogen nitrogen cycle permafrost protein soil horizon soil organic matter stoichiometry subsoil thawing transformation tundra Greenland Siberia Dewey Decimal Classification500 | Naturwissenschaften570 | Biowissenschaften, Biologie Wild, Birgit Schnecker, Jörg Bárta, Jiri Čapek, Petr Guggenberger, Georg Hofhansl, Florian Kaiser, Christina Lashchinskiy, Nikolay Mikutta, Robert Mooshammer, Maria Šantrůčková, Hana Shibistova, Olga Urich, Tim Zimov, Sergey A. Richter, Andreas Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
topic_facet |
Arctic Cryoturbation Ecological stoichiometry Nitrification Nitrogen availability Nitrogen mineralization Nitrogen transformation Protein depolymerization Soil organic matter Tundra Nitrogen transformations Soil organic matters Amino acids Biogeochemistry Decay organic Depolymerization Mineralogy Nitrogen Organic compounds Permafrost Proteins Soils arctic environment cryoturbation decomposition freezing microbial community mineralization nitrification nitrogen nitrogen cycle permafrost protein soil horizon soil organic matter stoichiometry subsoil thawing transformation tundra Greenland Siberia Dewey Decimal Classification500 | Naturwissenschaften570 | Biowissenschaften, Biologie |
description |
Turbic Cryosols (permafrost soils characterized by cryoturbation, i.e., by mixing of soil layers due to freezing and thawing) are widespread across the Arctic, and contain large amounts of poorly decomposed organic material buried in the subsoil. This cryoturbated organic matter exhibits retarded decomposition compared to organic material in the topsoil. Since soil organic matter (SOM) decomposition is known to be tightly linked to N availability, we investigated N transformation rates in different soil horizons of three tundra sites in north-eastern Siberia and Greenland. We measured gross rates of protein depolymerization, N mineralization (ammonification) and nitrification, as well as microbial uptake of amino acids and NH4 + using an array of 15N pool dilution approaches. We found that all sites and horizons were characterized by low N availability, as indicated by low N mineralization compared to protein depolymerization rates (with gross N mineralization accounting on average for 14% of gross protein depolymerization). The proportion of organic N mineralized was significantly higher at the Greenland than at the Siberian sites, suggesting differences in N limitation. The proportion of organic N mineralized, however, did not differ significantly between soil horizons, pointing to a similar N demand of the microbial community of each horizon. In contrast, absolute N transformation rates were significantly lower in cryoturbated than in organic horizons, with cryoturbated horizons reaching not more than 32% of the transformation rates in organic horizons. Our results thus indicate a deceleration of the entire N cycle in cryoturbated soil horizons, especially strongly reduced rates of protein depolymerization (16% of organic horizons) which is considered the rate-limiting step in soil N cycling. |
format |
Article in Journal/Newspaper |
author |
Wild, Birgit Schnecker, Jörg Bárta, Jiri Čapek, Petr Guggenberger, Georg Hofhansl, Florian Kaiser, Christina Lashchinskiy, Nikolay Mikutta, Robert Mooshammer, Maria Šantrůčková, Hana Shibistova, Olga Urich, Tim Zimov, Sergey A. Richter, Andreas |
author_facet |
Wild, Birgit Schnecker, Jörg Bárta, Jiri Čapek, Petr Guggenberger, Georg Hofhansl, Florian Kaiser, Christina Lashchinskiy, Nikolay Mikutta, Robert Mooshammer, Maria Šantrůčková, Hana Shibistova, Olga Urich, Tim Zimov, Sergey A. Richter, Andreas |
author_sort |
Wild, Birgit |
title |
Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
title_short |
Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
title_full |
Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
title_fullStr |
Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
title_full_unstemmed |
Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
title_sort |
nitrogen dynamics in turbic cryosols from siberia and greenland |
publisher |
Amsterdam : Elsevier |
publishDate |
2013 |
url |
https://dx.doi.org/10.15488/1403 http://www.repo.uni-hannover.de/handle/123456789/1428 |
long_lat |
ENVELOPE(-64.320,-64.320,-65.907,-65.907) |
geographic |
Arctic Dewey Greenland |
geographic_facet |
Arctic Dewey Greenland |
genre |
Arctic Greenland permafrost Tundra Siberia |
genre_facet |
Arctic Greenland permafrost Tundra Siberia |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.15488/1403 |
_version_ |
1766328928033570816 |