Insights into the subdaily variations in methane, nitrous oxide and carbon dioxide fluxes from upland tropical tree stems
2025
Bréchet, Laëtitia | Salomόn, Roberto | Machacova, Katerina | Stahl, Clément | Burban, Benoît | Goret, Jean‐yves | Steppe, Kathy | Bonal, Damien | Janssens, Ivan | Université de Guyane (UG) | University of Antwerp (UA) | Universidad Politécnica de Madrid (UPM) | Universiteit Gent = Ghent University = Université de Gand (UGENT) | Czech Academy of Sciences [Prague] (CAS) | Ecologie des forêts de Guyane (UMR ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-AgroParisTech-Université de Guyane (UG)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | SILVA (SILVA) ; AgroParisTech-Université de Lorraine (UL)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | ANR-10-LABX-0025,CEBA,CEnter of the study of Biodiversity in Amazonia(2010)
International audience
Mostrar más [+] Menos [-]Inglés. Summary Recent studies have shown that stem fluxes, although highly variable among trees, can alter the strength of the methane (CH 4 ) sink or nitrous oxide (N 2 O) source in some forests, but the patterns and magnitudes of these fluxes remain unclear. This study investigated the drivers of subdaily and seasonal variations in stem and soil CH 4 , N 2 O and carbon dioxide (CO 2 ) fluxes. CH 4 , N 2 O and CO 2 fluxes were measured continuously for 19 months in individual stems of two tree species, Eperua falcata (Aubl.) and Lecythis poiteaui (O. Berg), and surrounding soils using an automated chamber system in an upland tropical forest. Subdaily variations in these fluxes were related to environmental and stem physiological (sap flow and stem diameter variations) measurements under contrasting soil water conditions. The results showed that physiological and climatic drivers only partially explained the subdaily flux variations. Stem CH 4 and CO 2 emissions and N 2 O uptake varied with soil water content, time of day and between individuals. Stem fluxes decoupled from soil fluxes. Our study contributes to understanding the regulation of stem greenhouse gas fluxes. It suggests that additional variables (e.g. internal gas concentrations, wood‐colonising microorganisms, wood density and anatomy) may account for the remaining unexplained variability in stem fluxes, highlighting the need for further studies.
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