tailieunhanh - Báo cáo khoa học: "Soil CO in a beech forest: 2 efflux the contribution of root respiration Daniel"

OriTuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Soil CO in a beech forest: 2 efflux the contribution of root respiration Daniel. | 289 Ann. For. Sci. 56 1999 289-295 Inra Elsevier Paris Original article Soil CO2 efflux in a beech forest the contribution of root respiration Daniel Eprona Laetitia Farquea Eric Lucotb Pierre-Marie Badota b Equipe sciences végétales laboratoire biologie et ccophysiologie institut des sciences et des techniques de Fenvironnement université de Franche-Comté pole universitaire BP 71427 25211 Montbéliard cedex France bEquipe 1975 sciences végétales laboratoire biologie Ct écophysiologie institut des sciences Ct des techniques de renvironnement université de Franche-Comté place Leclerc 25030 Besanẹon ccdex France Received 24 September 1998 accepted 17 December 1998 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 CO2 efflux was measured every 2-4 weeks in 1997. An empirical model v A qv eBT 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 qv . The annual soil carbon efflux were kgc m 2 year1 in the main plot and kgc 111 2 year1 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 carbon efflux kgc nr2 year1 while root respiration accounts for 60 of soil c release kgc rn 2 year1 . Inra Elsevier Paris. carbon cycle Fagus sylvatica L. respiration root soil CO2 efflux Resume - Flux de CO2 provenant du sol dans une hêtraie la contribution de la respiration des racines. La contribution de la respiration des racines au flux 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 .