Amino acid production exceeds plant nitrogen demand in Siberian tundra
Arctic plant productivity is often limited by low soil N availability. This has been attributed to slow breakdown of N-containing polymers in litter and soil organic matter (SOM) into smaller, available units, and to shallow plant rooting constrained by permafrost and high soil moisture. Using N-15...
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ftdatacite:10.15488/4924 2023-05-15T14:42:01+02:00 Amino acid production exceeds plant nitrogen demand in Siberian tundra Wild, Birgit Alves, Ricardo J. Eloy Barta, Jiri Capek, Petr Gentsch, Norman Guggenberger, Georg Hugelius, Gustaf Knoltsch, Anna Kuhry, Peter Lashchinskiy, Nikolay Mikutta, Robert Palmtag, Juri Prommer, Judith Schnecker, Joerg Shibistova, Olga Takriti, Mounir Urich, Tim Richter, Andreas 2018 https://dx.doi.org/10.15488/4924 https://www.repo.uni-hannover.de/handle/123456789/4967 en eng Bristol : IOP Publishing Ltd. Creative Commons Attribution 3.0 Unported CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY permafrost tundra protein depolymerization nitrogen mineralization nitrogen limitation plant productivity Dewey Decimal Classification500 | Naturwissenschaften550 | Geowissenschaften Other CreativeWork article 2018 ftdatacite https://doi.org/10.15488/4924 2021-11-05T12:55:41Z Arctic plant productivity is often limited by low soil N availability. This has been attributed to slow breakdown of N-containing polymers in litter and soil organic matter (SOM) into smaller, available units, and to shallow plant rooting constrained by permafrost and high soil moisture. Using N-15 pool dilution assays, we here quantified gross amino acid and ammonium production rates in 97 active layer samples from four sites across the Siberian Arctic. We found that amino acid production in organic layers alone exceeded literature-based estimates of maximum plant N uptake 17-fold and therefore reject the hypothesis that arctic plant N limitation results from slow SOM breakdown. High microbial N use efficiency in organic layers rather suggests strong competition of microorganisms and plants in the dominant rooting zone. Deeper horizons showed lower amino acid production rates per volume, but also lower microbial N use efficiency. Permafrost thaw together with soil drainage might facilitate deeper plant rooting and uptake of previously inaccessible subsoil N, and thereby promote plant productivity in arctic ecosystems. We conclude that changes in microbial decomposer activity, microbial N utilization and plant root density with soil depth interactively control N availability for plants in the Arctic. Article in Journal/Newspaper Arctic permafrost Tundra DataCite Metadata Store (German National Library of Science and Technology) Arctic Dewey ENVELOPE(-64.320,-64.320,-65.907,-65.907) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
permafrost tundra protein depolymerization nitrogen mineralization nitrogen limitation plant productivity Dewey Decimal Classification500 | Naturwissenschaften550 | Geowissenschaften |
spellingShingle |
permafrost tundra protein depolymerization nitrogen mineralization nitrogen limitation plant productivity Dewey Decimal Classification500 | Naturwissenschaften550 | Geowissenschaften Wild, Birgit Alves, Ricardo J. Eloy Barta, Jiri Capek, Petr Gentsch, Norman Guggenberger, Georg Hugelius, Gustaf Knoltsch, Anna Kuhry, Peter Lashchinskiy, Nikolay Mikutta, Robert Palmtag, Juri Prommer, Judith Schnecker, Joerg Shibistova, Olga Takriti, Mounir Urich, Tim Richter, Andreas Amino acid production exceeds plant nitrogen demand in Siberian tundra |
topic_facet |
permafrost tundra protein depolymerization nitrogen mineralization nitrogen limitation plant productivity Dewey Decimal Classification500 | Naturwissenschaften550 | Geowissenschaften |
description |
Arctic plant productivity is often limited by low soil N availability. This has been attributed to slow breakdown of N-containing polymers in litter and soil organic matter (SOM) into smaller, available units, and to shallow plant rooting constrained by permafrost and high soil moisture. Using N-15 pool dilution assays, we here quantified gross amino acid and ammonium production rates in 97 active layer samples from four sites across the Siberian Arctic. We found that amino acid production in organic layers alone exceeded literature-based estimates of maximum plant N uptake 17-fold and therefore reject the hypothesis that arctic plant N limitation results from slow SOM breakdown. High microbial N use efficiency in organic layers rather suggests strong competition of microorganisms and plants in the dominant rooting zone. Deeper horizons showed lower amino acid production rates per volume, but also lower microbial N use efficiency. Permafrost thaw together with soil drainage might facilitate deeper plant rooting and uptake of previously inaccessible subsoil N, and thereby promote plant productivity in arctic ecosystems. We conclude that changes in microbial decomposer activity, microbial N utilization and plant root density with soil depth interactively control N availability for plants in the Arctic. |
format |
Article in Journal/Newspaper |
author |
Wild, Birgit Alves, Ricardo J. Eloy Barta, Jiri Capek, Petr Gentsch, Norman Guggenberger, Georg Hugelius, Gustaf Knoltsch, Anna Kuhry, Peter Lashchinskiy, Nikolay Mikutta, Robert Palmtag, Juri Prommer, Judith Schnecker, Joerg Shibistova, Olga Takriti, Mounir Urich, Tim Richter, Andreas |
author_facet |
Wild, Birgit Alves, Ricardo J. Eloy Barta, Jiri Capek, Petr Gentsch, Norman Guggenberger, Georg Hugelius, Gustaf Knoltsch, Anna Kuhry, Peter Lashchinskiy, Nikolay Mikutta, Robert Palmtag, Juri Prommer, Judith Schnecker, Joerg Shibistova, Olga Takriti, Mounir Urich, Tim Richter, Andreas |
author_sort |
Wild, Birgit |
title |
Amino acid production exceeds plant nitrogen demand in Siberian tundra |
title_short |
Amino acid production exceeds plant nitrogen demand in Siberian tundra |
title_full |
Amino acid production exceeds plant nitrogen demand in Siberian tundra |
title_fullStr |
Amino acid production exceeds plant nitrogen demand in Siberian tundra |
title_full_unstemmed |
Amino acid production exceeds plant nitrogen demand in Siberian tundra |
title_sort |
amino acid production exceeds plant nitrogen demand in siberian tundra |
publisher |
Bristol : IOP Publishing Ltd. |
publishDate |
2018 |
url |
https://dx.doi.org/10.15488/4924 https://www.repo.uni-hannover.de/handle/123456789/4967 |
long_lat |
ENVELOPE(-64.320,-64.320,-65.907,-65.907) |
geographic |
Arctic Dewey |
geographic_facet |
Arctic Dewey |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_rights |
Creative Commons Attribution 3.0 Unported CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.15488/4924 |
_version_ |
1766313687131357184 |