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Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production

Gross primary production (GPP) is a key driver of the peatland carbon cycle. Although many studies have explored the apparent GPP under natural light conditions, knowledge of the maximum GPP at light-saturation (GPP(max)) and its spatio-temporal variation is limited. This information, however, is cr...

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Autores principales: Peichl, Matthias, Gažovič, Michal, Vermeij, Ilse, de Goede, Eefje, Sonnentag, Oliver, Limpens, Juul, Nilsson, Mats B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5964230/
https://www.ncbi.nlm.nih.gov/pubmed/29789673
http://dx.doi.org/10.1038/s41598-018-26147-4
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author Peichl, Matthias
Gažovič, Michal
Vermeij, Ilse
de Goede, Eefje
Sonnentag, Oliver
Limpens, Juul
Nilsson, Mats B.
author_facet Peichl, Matthias
Gažovič, Michal
Vermeij, Ilse
de Goede, Eefje
Sonnentag, Oliver
Limpens, Juul
Nilsson, Mats B.
author_sort Peichl, Matthias
collection PubMed
description Gross primary production (GPP) is a key driver of the peatland carbon cycle. Although many studies have explored the apparent GPP under natural light conditions, knowledge of the maximum GPP at light-saturation (GPP(max)) and its spatio-temporal variation is limited. This information, however, is crucial since GPP(max) essentially constrains the upper boundary for apparent GPP. Using chamber measurements combined with an external light source across experimental plots where vegetation composition was altered through long-term (20-year) nitrogen addition and artificial warming, we could quantify GPP(max) in-situ and disentangle its biotic and abiotic controls in a boreal peatland. We found large spatial and temporal variations in the magnitudes of GPP(max) which were related to vegetation species composition and phenology rather than abiotic factors. Specifically, we identified vegetation phenology as the main driver of the seasonal GPP(max) trajectory. Abiotic anomalies (i.e. in air temperature and water table level), however, caused species-specific divergence between the trajectories of GPP(max) and plant development. Our study demonstrates that photosynthetically active biomass constrains the potential peatland photosynthesis while abiotic factors act as secondary modifiers. This further calls for a better representation of species-specific vegetation phenology in process-based peatland models to improve predictions of global change impacts on the peatland carbon cycle.
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spelling pubmed-59642302018-05-24 Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production Peichl, Matthias Gažovič, Michal Vermeij, Ilse de Goede, Eefje Sonnentag, Oliver Limpens, Juul Nilsson, Mats B. Sci Rep Article Gross primary production (GPP) is a key driver of the peatland carbon cycle. Although many studies have explored the apparent GPP under natural light conditions, knowledge of the maximum GPP at light-saturation (GPP(max)) and its spatio-temporal variation is limited. This information, however, is crucial since GPP(max) essentially constrains the upper boundary for apparent GPP. Using chamber measurements combined with an external light source across experimental plots where vegetation composition was altered through long-term (20-year) nitrogen addition and artificial warming, we could quantify GPP(max) in-situ and disentangle its biotic and abiotic controls in a boreal peatland. We found large spatial and temporal variations in the magnitudes of GPP(max) which were related to vegetation species composition and phenology rather than abiotic factors. Specifically, we identified vegetation phenology as the main driver of the seasonal GPP(max) trajectory. Abiotic anomalies (i.e. in air temperature and water table level), however, caused species-specific divergence between the trajectories of GPP(max) and plant development. Our study demonstrates that photosynthetically active biomass constrains the potential peatland photosynthesis while abiotic factors act as secondary modifiers. This further calls for a better representation of species-specific vegetation phenology in process-based peatland models to improve predictions of global change impacts on the peatland carbon cycle. Nature Publishing Group UK 2018-05-22 /pmc/articles/PMC5964230/ /pubmed/29789673 http://dx.doi.org/10.1038/s41598-018-26147-4 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Peichl, Matthias
Gažovič, Michal
Vermeij, Ilse
de Goede, Eefje
Sonnentag, Oliver
Limpens, Juul
Nilsson, Mats B.
Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title_full Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title_fullStr Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title_full_unstemmed Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title_short Peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
title_sort peatland vegetation composition and phenology drive the seasonal trajectory of maximum gross primary production
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5964230/
https://www.ncbi.nlm.nih.gov/pubmed/29789673
http://dx.doi.org/10.1038/s41598-018-26147-4
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