Tree stem methane emissions are regulated by site‐level biogeochemistry over species identity in Amazon floodplain forests.
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| Title: | Tree stem methane emissions are regulated by site‐level biogeochemistry over species identity in Amazon floodplain forests. |
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| Authors: | Blincow, Holly R.1 (AUTHOR) holly.blincow@cumbria.ac.uk, McNamara, Niall P.2 (AUTHOR), Elias, Dafydd M. O.2 (AUTHOR), Gomez, Carla1,3 (AUTHOR), Lamb, Jack4 (AUTHOR), Nunes de Sousa, Rodrigo1 (AUTHOR), Gris, Darlene5 (AUTHOR), Pequeno Reis, Leonardo5,6 (AUTHOR), Hoyt, Alison M.4 (AUTHOR), Pangala, Sunitha Rao1,3 (AUTHOR) s.pangala@imperial.ac.uk |
| Source: | New Phytologist. Jul2026, Vol. 251 Issue 1, p179-190. 12p. |
| Subjects: | Biogeochemistry, Pore fluids, Plant biomass, Greenhouse gas mitigation, Floodplain forests |
| Geographic Terms: | Amazon River |
| Abstract (English): | Summary: Tree stems in Amazonian floodplains emit substantial methane (CH4), yet controls on emission variability remain unclear. Emissions span orders of magnitude between várzea (nutrient‐rich) and igapó (nutrient‐poor) forests and among trees, suggesting controls beyond flooding.We tested whether site‐level biogeochemistry better explains stem CH4 variability than species identity by measuring emissions from two co‐occurring species with contrasting wood densities – Eschweilera coriacea and Hevea spruceana – across várzea and igapó forests. Emissions were paired with porewater chemistry (electrical conductivity, dissolved oxygen, dissolved CH4, and dissolved organic carbon), methane production potential (MPP), and root biomass.Stem CH4 emissions were significantly higher in várzea than in igapó, independent of species or stem height. Várzea porewaters displayed higher conductivity, dissolved CH4 and MPP, near‐neutral pH, and lower oxygen, with fine roots concentrated in the 0‐ to 50‐cm soil layer, indicating a shallow CH4 supply zone. Basal stem emissions in várzea correlated with shallow porewater chemistry and fine‐root biomass, whereas relationships in igapó were weak.These findings show that Amazonian floodplain stem CH4 emissions are governed by shallow site‐level biogeochemistry, rather than species identity alone and should be incorporated into basin‐scale CH4 budgets and process models to capture spatial variability. [ABSTRACT FROM AUTHOR] |
| Abstract (Portuguese): | Resumo: Troncos de árvores nas planícies alagáveis amazônicas emitem quantidades substanciais de metano (CH4), mas os fatores que controlam essa variabilidade ainda são pouco compreendidos. As emissões variam amplamente entre florestas de várzea (ricas em nutrientes) e igapó (pobres em nutrientes), bem como entre árvores, sugerindo controles além do alagamento.Avaliamos se a biogeoquímica em nível de sítio explica melhor a variabilidade do CH4 emitido pelos troncos do que a identidade das espécies, medindo emissões de duas espécies coocorrentes com densidades de madeira contrastantes – Eschweilera coriacea e Hevea spruceana – em várzea e igapó. As emissões foram relacionadas à química da água intersticial, ao potencial de produção de metano (MPP) e à biomassa radicular.As emissões foram maiores na várzea, independentemente da espécie ou da altura no tronco. A várzea apresentou maior condutividade, maiores concentrações de CH4 dissolvido e maior MPP, pH próximo à neutralidade e menor oxigênio, com raízes finas concentradas nos primeiros 50 cm do solo. Emissões basais correlacionaram‐se com a química superficial e a biomassa radicular na várzea, mas não no igapó.Os resultados indicam que as emissões são controladas principalmente pela biogeoquímica superficial do sítio, devendo ser incorporadas a modelos de CH4 em escala de bacia. [ABSTRACT FROM AUTHOR] |
| Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 194295728 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Tree stem methane emissions are regulated by site‐level biogeochemistry over species identity in Amazon floodplain forests. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Blincow%2C+Holly+R%2E%22">Blincow, Holly R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> holly.blincow@cumbria.ac.uk</i><br /><searchLink fieldCode="AR" term="%22McNamara%2C+Niall+P%2E%22">McNamara, Niall P.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Elias%2C+Dafydd+M%2E+O%2E%22">Elias, Dafydd M. O.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gomez%2C+Carla%22">Gomez, Carla</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lamb%2C+Jack%22">Lamb, Jack</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nunes+de+Sousa%2C+Rodrigo%22">Nunes de Sousa, Rodrigo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gris%2C+Darlene%22">Gris, Darlene</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pequeno+Reis%2C+Leonardo%22">Pequeno Reis, Leonardo</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hoyt%2C+Alison+M%2E%22">Hoyt, Alison M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pangala%2C+Sunitha+Rao%22">Pangala, Sunitha Rao</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> s.pangala@imperial.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Jul2026, Vol. 251 Issue 1, p179-190. 12p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Biogeochemistry%22">Biogeochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Pore+fluids%22">Pore fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+biomass%22">Plant biomass</searchLink><br /><searchLink fieldCode="DE" term="%22Greenhouse+gas+mitigation%22">Greenhouse gas mitigation</searchLink><br /><searchLink fieldCode="DE" term="%22Floodplain+forests%22">Floodplain forests</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Amazon+River%22">Amazon River</searchLink> – Name: Abstract Label: Abstract (English) Group: Ab Data: Summary: Tree stems in Amazonian floodplains emit substantial methane (CH4), yet controls on emission variability remain unclear. Emissions span orders of magnitude between várzea (nutrient‐rich) and igapó (nutrient‐poor) forests and among trees, suggesting controls beyond flooding.We tested whether site‐level biogeochemistry better explains stem CH4 variability than species identity by measuring emissions from two co‐occurring species with contrasting wood densities – Eschweilera coriacea and Hevea spruceana – across várzea and igapó forests. Emissions were paired with porewater chemistry (electrical conductivity, dissolved oxygen, dissolved CH4, and dissolved organic carbon), methane production potential (MPP), and root biomass.Stem CH4 emissions were significantly higher in várzea than in igapó, independent of species or stem height. Várzea porewaters displayed higher conductivity, dissolved CH4 and MPP, near‐neutral pH, and lower oxygen, with fine roots concentrated in the 0‐ to 50‐cm soil layer, indicating a shallow CH4 supply zone. Basal stem emissions in várzea correlated with shallow porewater chemistry and fine‐root biomass, whereas relationships in igapó were weak.These findings show that Amazonian floodplain stem CH4 emissions are governed by shallow site‐level biogeochemistry, rather than species identity alone and should be incorporated into basin‐scale CH4 budgets and process models to capture spatial variability. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Abstract (Portuguese) Group: Ab Data: Resumo: Troncos de árvores nas planícies alagáveis amazônicas emitem quantidades substanciais de metano (CH4), mas os fatores que controlam essa variabilidade ainda são pouco compreendidos. As emissões variam amplamente entre florestas de várzea (ricas em nutrientes) e igapó (pobres em nutrientes), bem como entre árvores, sugerindo controles além do alagamento.Avaliamos se a biogeoquímica em nível de sítio explica melhor a variabilidade do CH4 emitido pelos troncos do que a identidade das espécies, medindo emissões de duas espécies coocorrentes com densidades de madeira contrastantes – Eschweilera coriacea e Hevea spruceana – em várzea e igapó. As emissões foram relacionadas à química da água intersticial, ao potencial de produção de metano (MPP) e à biomassa radicular.As emissões foram maiores na várzea, independentemente da espécie ou da altura no tronco. A várzea apresentou maior condutividade, maiores concentrações de CH4 dissolvido e maior MPP, pH próximo à neutralidade e menor oxigênio, com raízes finas concentradas nos primeiros 50 cm do solo. Emissões basais correlacionaram‐se com a química superficial e a biomassa radicular na várzea, mas não no igapó.Os resultados indicam que as emissões são controladas principalmente pela biogeoquímica superficial do sítio, devendo ser incorporadas a modelos de CH4 em escala de bacia. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/nph.71168 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 179 Subjects: – SubjectFull: Biogeochemistry Type: general – SubjectFull: Pore fluids Type: general – SubjectFull: Plant biomass Type: general – SubjectFull: Greenhouse gas mitigation Type: general – SubjectFull: Floodplain forests Type: general – SubjectFull: Amazon River Type: general Titles: – TitleFull: Tree stem methane emissions are regulated by site‐level biogeochemistry over species identity in Amazon floodplain forests. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Blincow, Holly R. – PersonEntity: Name: NameFull: McNamara, Niall P. – PersonEntity: Name: NameFull: Elias, Dafydd M. O. – PersonEntity: Name: NameFull: Gomez, Carla – PersonEntity: Name: NameFull: Lamb, Jack – PersonEntity: Name: NameFull: Nunes de Sousa, Rodrigo – PersonEntity: Name: NameFull: Gris, Darlene – PersonEntity: Name: NameFull: Pequeno Reis, Leonardo – PersonEntity: Name: NameFull: Hoyt, Alison M. – PersonEntity: Name: NameFull: Pangala, Sunitha Rao IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 0028646X Numbering: – Type: volume Value: 251 – Type: issue Value: 1 Titles: – TitleFull: New Phytologist Type: main |
| ResultId | 1 |
