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Soil CO2 efflux in a beech forest: the contribution of root respiration

Open access
Epron, Daniel, Farque, Laetitia, Lucot, Eric, Badot, Pierre-Marie·1999·ANNALS OF FOREST SCIENCE

Abstract

The contribution of root respiration to soil carbon efflux in a young beech stand was estimated by comparing soil CO, efflux from small trenched plots to efflux from undisturbed areas (main plot).Soil CO 2 efflux was measured every 2-4 weeks in 1997.An empirical model (y = A q v e BT ) was fitted to the soil CO, efflux data and was used to calculate annual soil carbon efflux from soil temperature (T) and soil volumetric water content (q v ).The annual soil carbon efflux were 0.66 kg C m -2 year -1 in the main plot and 0.42 kg C m -2 year -1 in the trenched plots.The difference between these two estimations was corrected for the decomposition of roots that were killed following trenching.The heterotrophic component of soil carbon efflux accounts for 40 % of total soil car- bon efflux (0.26 kg C m -2 year -1 ) while root respiration accounts for 60 % of soil C release (0.40 kg C m -2 year -1 ).(© Inra/Elsevier, Paris.)carbon cycle / Fagus sylvatica L. / respiration / root / soil CO 2 efflux Résumé -Flux de CO 2 provenant du sol dans une hêtraie : la contribution de la respiration des racines.La contribution de la respiration des racines au tlux de carbone provenant du sol d'une jeune hêtraie a été estimée en comparant le flux de CO, provenant du sol sur des petites placettes isolées par une tranchée au flux de CO, provenant du sol mesuré sur la placette principale.Le flux de CO, provenant du sol a été mesuré toutes les 2 à 4 semaines en 1997.Un modèle empirique (y = A & t h e t a s ; v e BT ) a été ajusté sur les don- nées de flux de CO 2 provenant du sol, et utilisé pour calculer le flux annuel de carbone provenant du sol à partir de la température du sol (T) et de la teneur en eau volumique du sol (&thetas; v ).Les flux annuels de carbone provenant du sol étaient de 0,66 kg C m -2 y -1 pour la placette principale et de 0,42 kg C m -2 y -1 pour les petites placettes isolées par une tranchée.La différence entre les deux estimations a été corrigée pour prendre en compte la décomposition des racines tuées lors de l'établissement de la tranchée.La composante hétéro- trophe représente 40 % du flux total de carbone provenant du sol (0,26 kg C m -2 y -1 ) alors que la respiration des racines représente 60 % du dégagement de carbone (0,40 kg C m -2 y -1 ).(© Inra/Elsevier, Paris.)cycle du carbone / Fagus sylvatica L. / respiration / racine / flux de CO, provenant du sol.

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Crossref · 10.1051/forest:19990403

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Metadata

Authors
Epron, D., Farque, L., Lucot, E., & Badot, P.-M.
Venue
ANNALS OF FOREST SCIENCE
Publisher
EDP Sciences
Published
1999
Volume
56
Issue
4
Pages
289-295
ISSN
0003-4312 (ISSN-L)
OpenAlex
W2054942731
Cited by
204
References
1
FWCI
11.46
Type
journal article
Language
en
Open access
bronze

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Epron, D., Farque, L., Lucot, E., & Badot, P.-M. (1999). Soil CO2 efflux in a beech forest: the contribution of root respiration. ANNALS OF FOREST SCIENCE. https://doi.org/10.1051/forest%3A19990403

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