Amino acid production exceeds plant nitrogen demand in Siberian tundra

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897769" target="_blank" >RIV/60076658:12310/18:43897769 - isvavai.cz</a>

Result on the web

<a href="http://iopscience.iop.org/article/10.1088/1748-9326/aaa4fa/pdf" target="_blank" >http://iopscience.iop.org/article/10.1088/1748-9326/aaa4fa/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1748-9326/aaa4fa" target="_blank" >10.1088/1748-9326/aaa4fa</a>

Result language

angličtina

Original language name

Amino acid production exceeds plant nitrogen demand in Siberian tundra

Original language 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10618 - Ecology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Environmental Research Letters

ISSN

1748-9326

e-ISSN

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Volume of the periodical

13

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

11

Pages from-to

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UT code for WoS article

000425435300002

EID of the result in the Scopus database

2-s2.0-85048288102