Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence

Autores
Münchberger, Wiebke; Knorr, Klaus-Holger; Blodau, Christian; Pancotto, Veronica Andrea; Kleinebecker, Till
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Peatlands are significant global methane (CH4) sources, but processes governing CH4 dynamics have been predominantly studied on the northern hemisphere. Southern hemispheric and tropical bogs can be dominated by cushion forming vascular plants (e.g. Astelia pumila, Donatia fascicularis). These cushion bogs are found in many (mostly southern) parts of the world but could also serve as extreme examples for densely rooted northern hemispheric bogs dominated by rushes and sedges. We report highly variable summer CH4 emissions from different microforms in a Patagonian cushion bog as  determined by chamber measurements. Driving biogeochemical processes were identified from pore water profiles and carbon isotopic signatures. An intensive root activity within a rhizosphere stretching over 2 m depth accompanied by molecular 25 oxygen release created aerobic microsites in water-saturated peat leading to a thorough CH4 oxidation (< 0.003 mmol L-1 pore water CH4, enriched δ13C-CH4 by up to 10?) and negligible emissions (0.09 ± 0.16 mmol CH4 m-2 d-1) from Astelia lawns. Root activity even suppressed CH4 emissions from non-rooted peat below adjacent pools (0.23 ± 0.25 mmol CH4 m-2 d-1), in which we found similar pore water profile patterns as obtained under Astelia lawns. Below the rhizosphere pore water concentrations increased sharply to 0.40 ± 0.25 mmol CH4 L-1 and CH4 was predominantly produced by hydrogenotrophic 30 methanogenesis. Few Sphagnum lawns and ? surprisingly ? one lawn dominated by cushion-forming D. fascicularis were found to be local CH4 emission hot spots with up to 1.52 ± 1.10 mmol CH4 m-2 d-1 presumably as root density and molecular oxygen release dropped below a certain threshold. The spatial distribution of root characteristics supposedly causing such pronounced CH4 emission pattern was evaluated on a conceptual level that aimed to reflect extreme examples of general scenarios in densely rooted bogs. We conclude that presence of cushion vegetation as a proxy for negligible CH4 emissionsfrom cushion bogs needs to be interpreted with caution. Nevertheless, overall ecosystem CH4 emissions at our study site were probably minute compared to bog ecosystems worldwide and widely decoupled from environmental controls due intensiveroot activity of e.g. A. pumila.
Fil: Münchberger, Wiebke. Münster University; Alemania
Fil: Knorr, Klaus-Holger. Münster University; Alemania
Fil: Blodau, Christian. Münster University; Alemania
Fil: Pancotto, Veronica Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: Kleinebecker, Till. Münster University; Alemania
Materia
peatlands
Carbon cycle
CH4
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/117068

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network_name_str CONICET Digital (CONICET)
spelling Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidenceMünchberger, WiebkeKnorr, Klaus-HolgerBlodau, ChristianPancotto, Veronica AndreaKleinebecker, TillpeatlandsCarbon cycleCH4https://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Peatlands are significant global methane (CH4) sources, but processes governing CH4 dynamics have been predominantly studied on the northern hemisphere. Southern hemispheric and tropical bogs can be dominated by cushion forming vascular plants (e.g. Astelia pumila, Donatia fascicularis). These cushion bogs are found in many (mostly southern) parts of the world but could also serve as extreme examples for densely rooted northern hemispheric bogs dominated by rushes and sedges. We report highly variable summer CH4 emissions from different microforms in a Patagonian cushion bog as  determined by chamber measurements. Driving biogeochemical processes were identified from pore water profiles and carbon isotopic signatures. An intensive root activity within a rhizosphere stretching over 2 m depth accompanied by molecular 25 oxygen release created aerobic microsites in water-saturated peat leading to a thorough CH4 oxidation (< 0.003 mmol L-1 pore water CH4, enriched δ13C-CH4 by up to 10?) and negligible emissions (0.09 ± 0.16 mmol CH4 m-2 d-1) from Astelia lawns. Root activity even suppressed CH4 emissions from non-rooted peat below adjacent pools (0.23 ± 0.25 mmol CH4 m-2 d-1), in which we found similar pore water profile patterns as obtained under Astelia lawns. Below the rhizosphere pore water concentrations increased sharply to 0.40 ± 0.25 mmol CH4 L-1 and CH4 was predominantly produced by hydrogenotrophic 30 methanogenesis. Few Sphagnum lawns and ? surprisingly ? one lawn dominated by cushion-forming D. fascicularis were found to be local CH4 emission hot spots with up to 1.52 ± 1.10 mmol CH4 m-2 d-1 presumably as root density and molecular oxygen release dropped below a certain threshold. The spatial distribution of root characteristics supposedly causing such pronounced CH4 emission pattern was evaluated on a conceptual level that aimed to reflect extreme examples of general scenarios in densely rooted bogs. We conclude that presence of cushion vegetation as a proxy for negligible CH4 emissionsfrom cushion bogs needs to be interpreted with caution. Nevertheless, overall ecosystem CH4 emissions at our study site were probably minute compared to bog ecosystems worldwide and widely decoupled from environmental controls due intensiveroot activity of e.g. A. pumila.Fil: Münchberger, Wiebke. Münster University; AlemaniaFil: Knorr, Klaus-Holger. Münster University; AlemaniaFil: Blodau, Christian. Münster University; AlemaniaFil: Pancotto, Veronica Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; ArgentinaFil: Kleinebecker, Till. Münster University; AlemaniaCopernicus Publications2019-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/117068Münchberger, Wiebke; Knorr, Klaus-Holger; Blodau, Christian; Pancotto, Veronica Andrea; Kleinebecker, Till; Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence; Copernicus Publications; Biogeosciences; 26; 2; 1-2019; 541-5591726-41701726-4189CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://bg.copernicus.org/articles/16/541/2019/info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-16-541-2019info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:32:55Zoai:ri.conicet.gov.ar:11336/117068instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:32:56.024CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
title Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
spellingShingle Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
Münchberger, Wiebke
peatlands
Carbon cycle
CH4
title_short Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
title_full Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
title_fullStr Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
title_full_unstemmed Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
title_sort Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence
dc.creator.none.fl_str_mv Münchberger, Wiebke
Knorr, Klaus-Holger
Blodau, Christian
Pancotto, Veronica Andrea
Kleinebecker, Till
author Münchberger, Wiebke
author_facet Münchberger, Wiebke
Knorr, Klaus-Holger
Blodau, Christian
Pancotto, Veronica Andrea
Kleinebecker, Till
author_role author
author2 Knorr, Klaus-Holger
Blodau, Christian
Pancotto, Veronica Andrea
Kleinebecker, Till
author2_role author
author
author
author
dc.subject.none.fl_str_mv peatlands
Carbon cycle
CH4
topic peatlands
Carbon cycle
CH4
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Peatlands are significant global methane (CH4) sources, but processes governing CH4 dynamics have been predominantly studied on the northern hemisphere. Southern hemispheric and tropical bogs can be dominated by cushion forming vascular plants (e.g. Astelia pumila, Donatia fascicularis). These cushion bogs are found in many (mostly southern) parts of the world but could also serve as extreme examples for densely rooted northern hemispheric bogs dominated by rushes and sedges. We report highly variable summer CH4 emissions from different microforms in a Patagonian cushion bog as  determined by chamber measurements. Driving biogeochemical processes were identified from pore water profiles and carbon isotopic signatures. An intensive root activity within a rhizosphere stretching over 2 m depth accompanied by molecular 25 oxygen release created aerobic microsites in water-saturated peat leading to a thorough CH4 oxidation (< 0.003 mmol L-1 pore water CH4, enriched δ13C-CH4 by up to 10?) and negligible emissions (0.09 ± 0.16 mmol CH4 m-2 d-1) from Astelia lawns. Root activity even suppressed CH4 emissions from non-rooted peat below adjacent pools (0.23 ± 0.25 mmol CH4 m-2 d-1), in which we found similar pore water profile patterns as obtained under Astelia lawns. Below the rhizosphere pore water concentrations increased sharply to 0.40 ± 0.25 mmol CH4 L-1 and CH4 was predominantly produced by hydrogenotrophic 30 methanogenesis. Few Sphagnum lawns and ? surprisingly ? one lawn dominated by cushion-forming D. fascicularis were found to be local CH4 emission hot spots with up to 1.52 ± 1.10 mmol CH4 m-2 d-1 presumably as root density and molecular oxygen release dropped below a certain threshold. The spatial distribution of root characteristics supposedly causing such pronounced CH4 emission pattern was evaluated on a conceptual level that aimed to reflect extreme examples of general scenarios in densely rooted bogs. We conclude that presence of cushion vegetation as a proxy for negligible CH4 emissionsfrom cushion bogs needs to be interpreted with caution. Nevertheless, overall ecosystem CH4 emissions at our study site were probably minute compared to bog ecosystems worldwide and widely decoupled from environmental controls due intensiveroot activity of e.g. A. pumila.
Fil: Münchberger, Wiebke. Münster University; Alemania
Fil: Knorr, Klaus-Holger. Münster University; Alemania
Fil: Blodau, Christian. Münster University; Alemania
Fil: Pancotto, Veronica Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; Argentina
Fil: Kleinebecker, Till. Münster University; Alemania
description Peatlands are significant global methane (CH4) sources, but processes governing CH4 dynamics have been predominantly studied on the northern hemisphere. Southern hemispheric and tropical bogs can be dominated by cushion forming vascular plants (e.g. Astelia pumila, Donatia fascicularis). These cushion bogs are found in many (mostly southern) parts of the world but could also serve as extreme examples for densely rooted northern hemispheric bogs dominated by rushes and sedges. We report highly variable summer CH4 emissions from different microforms in a Patagonian cushion bog as  determined by chamber measurements. Driving biogeochemical processes were identified from pore water profiles and carbon isotopic signatures. An intensive root activity within a rhizosphere stretching over 2 m depth accompanied by molecular 25 oxygen release created aerobic microsites in water-saturated peat leading to a thorough CH4 oxidation (< 0.003 mmol L-1 pore water CH4, enriched δ13C-CH4 by up to 10?) and negligible emissions (0.09 ± 0.16 mmol CH4 m-2 d-1) from Astelia lawns. Root activity even suppressed CH4 emissions from non-rooted peat below adjacent pools (0.23 ± 0.25 mmol CH4 m-2 d-1), in which we found similar pore water profile patterns as obtained under Astelia lawns. Below the rhizosphere pore water concentrations increased sharply to 0.40 ± 0.25 mmol CH4 L-1 and CH4 was predominantly produced by hydrogenotrophic 30 methanogenesis. Few Sphagnum lawns and ? surprisingly ? one lawn dominated by cushion-forming D. fascicularis were found to be local CH4 emission hot spots with up to 1.52 ± 1.10 mmol CH4 m-2 d-1 presumably as root density and molecular oxygen release dropped below a certain threshold. The spatial distribution of root characteristics supposedly causing such pronounced CH4 emission pattern was evaluated on a conceptual level that aimed to reflect extreme examples of general scenarios in densely rooted bogs. We conclude that presence of cushion vegetation as a proxy for negligible CH4 emissionsfrom cushion bogs needs to be interpreted with caution. Nevertheless, overall ecosystem CH4 emissions at our study site were probably minute compared to bog ecosystems worldwide and widely decoupled from environmental controls due intensiveroot activity of e.g. A. pumila.
publishDate 2019
dc.date.none.fl_str_mv 2019-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/117068
Münchberger, Wiebke; Knorr, Klaus-Holger; Blodau, Christian; Pancotto, Veronica Andrea; Kleinebecker, Till; Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence; Copernicus Publications; Biogeosciences; 26; 2; 1-2019; 541-559
1726-4170
1726-4189
CONICET Digital
CONICET
url http://hdl.handle.net/11336/117068
identifier_str_mv Münchberger, Wiebke; Knorr, Klaus-Holger; Blodau, Christian; Pancotto, Veronica Andrea; Kleinebecker, Till; Zero to moderate methane emissions in a densely rooted, pristine Patagonian bog - biogeochemical controls as revealed from isotopic evidence; Copernicus Publications; Biogeosciences; 26; 2; 1-2019; 541-559
1726-4170
1726-4189
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://bg.copernicus.org/articles/16/541/2019/
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-16-541-2019
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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