Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 034002 |
| Fachzeitschrift | Environmental research letters |
| Jahrgang | 13 |
| Ausgabenummer | 3 |
| Frühes Online-Datum | 16 Feb. 2018 |
| Publikationsstatus | Veröffentlicht - März 2018 |
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 15N 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.
ASJC Scopus Sachgebiete
- Energie (insg.)
- Erneuerbare Energien, Nachhaltigkeit und Umwelt
- Umweltwissenschaften (insg.)
- Allgemeine Umweltwissenschaft
- Medizin (insg.)
- Öffentliche Gesundheit, Umwelt- und Arbeitsmedizin
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in: Environmental research letters, Jahrgang 13, Nr. 3, 034002, 03.2018.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Amino acid production exceeds plant nitrogen demand in Siberian tundra
AU - Wild, Birgit
AU - Alves, Ricardo J.Eloy
AU - Bárta, Jiři
AU - Čapek, Petr
AU - Gentsch, Norman
AU - Guggenberger, Georg
AU - Hugelius, Gustaf
AU - Knoltsch, Anna
AU - Kuhry, Peter
AU - Lashchinskiy, Nikolay
AU - Mikutta, Robert
AU - Palmtag, Juri
AU - Prommer, Judith
AU - Schnecker, Jörg
AU - Shibistova, Olga
AU - Takriti, Mounir
AU - Urich, Tim
AU - Richter, Andreas
N1 - Funding information: This study is part of the CryoCARB project (Long-term Carbon Storage in Cryoturbated Arctic Soils), co-funded by the Austrian Science Fund (FWF): I370-B17, the German Federal Ministry of Education and Research (03F0616A), the Czech Ministry of Education, Youth and Sports (MSM 7E10073—CryoCARB), the Russian Ministry of Education and Science (No. 14.B25.31.0031), the Swedish Research Council (824–2009-77357), and the Norwegian Research Fund (NFR): NFR-200411, and was further supported by a JPI Climate Project (COUP-Austria; BMWFW-6.020/0008) awarded to Andreas Richter. Jir?i Bárta and Tim Urich received additional funding from the Czech Science Foundation (16–18453S).
PY - 2018/3
Y1 - 2018/3
N2 - 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 15N 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.
AB - 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 15N 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.
UR - http://www.scopus.com/inward/record.url?scp=85048288102&partnerID=8YFLogxK
U2 - 10.1088/1748-9326/aaa4fa
DO - 10.1088/1748-9326/aaa4fa
M3 - Article
AN - SCOPUS:85048288102
VL - 13
JO - Environmental research letters
JF - Environmental research letters
SN - 1748-9318
IS - 3
M1 - 034002
ER -