Moss species and precipitation mediate experimental warming stimulation of growing season N2 fixation in subarctic tundra ...

Climate change in high latitude regions leads to both higher temperatures and more precipitation but their combined effects on terrestrial ecosystem processes are poorly understood. In nitrogen (N) limited and often moss-dominated tundra and boreal ecosystems, moss-associated N2 fixation is an impor...

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Bibliographic Details
Main Authors: Lett, Signe, Christiansen, Casper Tai, Dorrepaal, Ellen, Michelsen, Anders
Format: Article in Journal/Newspaper
Language:unknown
Published: Zenodo 2024
Subjects:
Hylocomium splendens
Sphagnum
Pleurozium schreberi
Rain
Nitrogen fixation
bryophytes
alpine
Seasonal variations
delta 13C
moss density
Acetylene reduction assay
soil moisture
soil temperature
15N uptake
conversion factor
Climate change
Subarctic
Tundra
Online Access:https://dx.doi.org/10.5281/zenodo.12090334
https://zenodo.org/doi/10.5281/zenodo.12090334
Description
Summary:Climate change in high latitude regions leads to both higher temperatures and more precipitation but their combined effects on terrestrial ecosystem processes are poorly understood. In nitrogen (N) limited and often moss-dominated tundra and boreal ecosystems, moss-associated N2 fixation is an important process that provides new N. We tested if high mean annual precipitation enhanced experimental warming effects on growing season N2 fixation in three common arctic-boreal moss species adapted to different moisture conditions and evaluated their N contribution to the landscape level. We measured in situ N2 fixation rates in Hylocomium splendens, Pleurozium schreberi and Sphagnum spp. from June to September in subarctic tundra in Sweden. We exposed mosses occurring along a natural precipitation gradient (mean annual precipitation: 571-1155 mm) to eight years of experimental summer warming using open-top chambers before our measurements. We modelled species-specific seasonal N input to the ecosystem at the ... : Funding provided by: Independent Research Fund DenmarkCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100004836Award Number: 0135–00140B Funding provided by: Knut och Alice Wallenberg Foundation*Crossref Funder Registry ID: Award Number: KAW 2017.0298 Funding provided by: European Union Horizon 2020*Crossref Funder Registry ID: Award Number: 797446 Funding provided by: Danish National Research FoundationROR ID: https://ror.org/00znyv691Award Number: CENPERM DNRF100 ...

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