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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ftiiasalaxendare:oai:pure.iiasa.ac.at:10693 2023-05-15T15:10:41+02:00 Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland Wild, B. Schnecker, J. Barta, J. Capek, P. Guggenberger, G. Hofhansl, F. Kaiser, C. Lashchinsky, N. Mikutta, R. Mooshammer, M. Santruckova, H. Shibistova, O. Urich, T. Zimov, S.A. Richter, A. 2013 text http://pure.iiasa.ac.at/id/eprint/10693/ http://pure.iiasa.ac.at/id/eprint/10693/1/IR-13-074.pdf en eng IR-13-074 http://pure.iiasa.ac.at/id/eprint/10693/1/IR-13-074.pdf Wild, B., Schnecker, J., Barta, J., Capek, P., Guggenberger, G., Hofhansl, F., Kaiser, C. <http://pure.iiasa.ac.at/view/iiasa/143.html>, Lashchinsky, N., et al. (2013). Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-13-074 Monograph NonPeerReviewed 2013 ftiiasalaxendare 2022-04-15T12:34:41Z 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 measurd 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 44 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 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 cosidred the rate-limiting step in soil N cycling. Book Arctic Greenland permafrost Tundra Siberia IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) Arctic Greenland |
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Open Polar |
collection |
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis) |
op_collection_id |
ftiiasalaxendare |
language |
English |
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 measurd 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 44 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 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 cosidred the rate-limiting step in soil N cycling. |
format |
Book |
author |
Wild, B. Schnecker, J. Barta, J. Capek, P. Guggenberger, G. Hofhansl, F. Kaiser, C. Lashchinsky, N. Mikutta, R. Mooshammer, M. Santruckova, H. Shibistova, O. Urich, T. Zimov, S.A. Richter, A. |
spellingShingle |
Wild, B. Schnecker, J. Barta, J. Capek, P. Guggenberger, G. Hofhansl, F. Kaiser, C. Lashchinsky, N. Mikutta, R. Mooshammer, M. Santruckova, H. Shibistova, O. Urich, T. Zimov, S.A. Richter, A. Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland |
author_facet |
Wild, B. Schnecker, J. Barta, J. Capek, P. Guggenberger, G. Hofhansl, F. Kaiser, C. Lashchinsky, N. Mikutta, R. Mooshammer, M. Santruckova, H. Shibistova, O. Urich, T. Zimov, S.A. Richter, A. |
author_sort |
Wild, B. |
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 |
IR-13-074 |
publishDate |
2013 |
url |
http://pure.iiasa.ac.at/id/eprint/10693/ http://pure.iiasa.ac.at/id/eprint/10693/1/IR-13-074.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland permafrost Tundra Siberia |
genre_facet |
Arctic Greenland permafrost Tundra Siberia |
op_relation |
http://pure.iiasa.ac.at/id/eprint/10693/1/IR-13-074.pdf Wild, B., Schnecker, J., Barta, J., Capek, P., Guggenberger, G., Hofhansl, F., Kaiser, C. <http://pure.iiasa.ac.at/view/iiasa/143.html>, Lashchinsky, N., et al. (2013). Nitrogen dynamics in Turbic Cryosols from Siberia and Greenland. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-13-074 |
_version_ |
1766341667047079936 |