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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/117068
Ver los metadatos del registro completo
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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 |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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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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13.070432 |