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Partitioning seasonal stem carbon dioxide efflux into stem respiration, bark photosynthesis, and transport-related flux in Scots pine

cris.lastimport.scopus2025-10-23T07:00:50Z
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cris.virtualsource.author-orcid454d47d0-3892-4b3a-a5c3-927100a1f1db
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dc.abstract.enStem CO2 efflux is an important component of the carbon balance in forests. The efflux is considered to principally reflect the net result of two dominating and opposing processes: stem respiration and stem photosynthesis. In addition, transport of CO2 in xylem sap is thought to play an appreciable role in affecting the net flux. This work presents an approach to partition stem CO2 efflux among these processes using sap-flux data and CO2-exchange measurements from dark and transparent chambers placed on mature Scots pine (Pinus sylvestris) trees. Seasonal changes and monthly parameters describing the studied processes were determined. Respiration contributed most to stem net CO2 flux, reaching up to 79% (considering the sum of the absolute values of stem respiration, stem photosynthesis, and flux from CO2 transported in xylem sap to be 100%) in June, when stem growth was greatest. The contribution of photosynthesis accounted for up to 13% of the stem net CO2 flux, increasing over the monitoring period. CO2 transported axially with sap flow decreased towards the end of the growing season. At a reference temperature, respiration decreased starting around midsummer, while its temperature sensitivity increased during the summer. A decline was observed for photosynthetic quantum yield around midsummer together with a decrease in light-saturation point. The proposed approach facilitates modeling net stem CO2 flux at a range of time scales.
dc.affiliationWydział Inżynierii Środowiska i Inżynierii Mechanicznej
dc.affiliation.instituteKatedra Budownictwa i Geoinżynierii
dc.contributor.authorDukat, Paulina
dc.contributor.authorHölttä, Teemu
dc.contributor.authorOren, Ram
dc.contributor.authorSalmon, Yann
dc.contributor.authorUrbaniak, Marek
dc.contributor.authorVesala, Timo
dc.contributor.authorAalto, Juho
dc.contributor.authorLintunen, Anna
dc.date.access2025-04-29
dc.date.accessioned2025-04-29T08:30:12Z
dc.date.available2025-04-29T08:30:12Z
dc.date.copyright2024-05-23
dc.date.issued2024
dc.description.abstract<jats:title>Abstract</jats:title> <jats:p>Stem CO2 efflux is an important component of the carbon balance in forests. The efflux is considered to principally reflect the net result of two dominating and opposing processes: stem respiration and stem photosynthesis. In addition, transport of CO2 in xylem sap is thought to play an appreciable role in affecting the net flux. This work presents an approach to partition stem CO2 efflux among these processes using sap-flux data and CO2-exchange measurements from dark and transparent chambers placed on mature Scots pine (Pinus sylvestris) trees. Seasonal changes and monthly parameters describing the studied processes were determined. Respiration contributed most to stem net CO2 flux, reaching up to 79% (considering the sum of the absolute values of stem respiration, stem photosynthesis, and flux from CO2 transported in xylem sap to be 100%) in June, when stem growth was greatest. The contribution of photosynthesis accounted for up to 13% of the stem net CO2 flux, increasing over the monitoring period. CO2 transported axially with sap flow decreased towards the end of the growing season. At a reference temperature, respiration decreased starting around midsummer, while its temperature sensitivity increased during the summer. A decline was observed for photosynthetic quantum yield around midsummer together with a decrease in light-saturation point. The proposed approach facilitates modeling net stem CO2 flux at a range of time scales.</jats:p>
dc.description.accesstimeat_publication
dc.description.bibliographyil., bibliogr.
dc.description.financepublication_nocost
dc.description.financecost0,00
dc.description.if5,8
dc.description.number16
dc.description.points140
dc.description.versionfinal_published
dc.description.volume75
dc.identifier.doi10.1093/jxb/erae242
dc.identifier.eissn1460-2431
dc.identifier.issn0022-0957
dc.identifier.urihttps://sciencerep.up.poznan.pl/handle/item/2730
dc.identifier.weblinkhttps://academic.oup.com/jxb/article/75/16/4944/7680161?login=true
dc.languageen
dc.pbn.affiliationenvironmental engineering, mining and energy
dc.relation.ispartofJournal of Experimental Botany
dc.relation.pages4944-4959
dc.rightsCC-BY
dc.sciencecloudsend
dc.share.typeOTHER
dc.subject.enCO2 efflux
dc.subject.enCO2 transport in xylem sap
dc.subject.ensap flow
dc.subject.enScots pine
dc.subject.enstem photosynthesis
dc.subject.enstem respiration
dc.titlePartitioning seasonal stem carbon dioxide efflux into stem respiration, bark photosynthesis, and transport-related flux in Scots pine
dc.typeJournalArticle
dspace.entity.typePublication
oaire.citation.issue16
oaire.citation.volume75