Amino acid production exceeds plant nitrogen demand in Siberian tundra

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dc.identifier.uri 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 2019-06-03T07:42:17Z 2019-06-03T07:42:17Z 2018
dc.identifier.citation Wild, B. et al.: Amino acid production exceeds plant nitrogen demand in Siberian tundra. In: Environmental Research Letters 13 (2018), Nr. 3, 034002. DOI:
dc.description.abstract 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. eng
dc.language.iso eng
dc.publisher Bristol : IOP Publishing Ltd.
dc.relation.ispartofseries Environmental Research Letters 13 (2018), Nr. 3
dc.rights CC BY 3.0 Unported
dc.subject permafrost eng
dc.subject tundra eng
dc.subject protein depolymerization eng
dc.subject nitrogen mineralization eng
dc.subject nitrogen limitation eng
dc.subject plant productivity eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Amino acid production exceeds plant nitrogen demand in Siberian tundra eng
dc.type Article
dc.type Text
dc.bibliographicCitation.issue 3
dc.bibliographicCitation.volume 13
dc.bibliographicCitation.firstPage 034002
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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