TAILIEUCHUNG - Báo cáo lâm nghiệp: "Biomass increment and carbon balance of ash (Fraxinus excelsior) trees in an experimental stand in northeastern France"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Biomass increment and carbon balance of ash (Fraxinus excelsior) trees in an experimental stand in northeastern France. | Ann. For. Sci. 61 2004 577-588 INRA EDP Sciences 2004 DOI forest 2004053 577 Original article Biomass increment and carbon balance of ash Fraxinus excelsior trees in an experimental stand in northeastern France Noel Le GOFFa André GRANIERb Jean-Marc OTTORINIa Marianne PEIFFERb a LERFoB UMR INRA ENGREF Équipe Croissance et Production INRA Centre de Nancy 54280 Champenoux France b EEF UMR INRA UHP Équipe Bioclimatologie et Écophysiologie INRA Centre de Nancy 54280 Champenoux France Received 22 July 2002 accepted 8 March 2004 Abstract - In this study we compared the annual biomass increment of ash trees to their annual carbon balance calculated from the end of the growing season in 1994 to the end of the next one in 1995. In 1995 three trees of variable competitive status and aged 25 were studied. Stem branch and root biomass increments were derived from detailed measurements. Tree crowns were divided vertically into three layers. In each crown layer the foliage biomass and area were determined net CO2 assimilation An and global radiation Rg were measured regularly throughout the growing season. Outside this period Rg was estimated from global radiation measured above the canopy and from estimations of light transmittance. Net assimilation of trees An was obtained by scaling leaf An to the tree level using relations established between An and Rg for each crown layer the distribution of foliage area and measured climatic data. Above- and below-ground tree respirations not measured were estimated. An was correlated to Rg and potential evapotranspiration. It decreased from the upper to the lower crown layers but was independent of tree competitive status. Total estimated respiration of trees accounted for about 37 of gross assimilation. The proportion of carbon allocated to the stem was more than 45 . Net productivity of trees obtained from simulated annual carbon fluxes compared reasonably well with the biomass increment of trees. biomass partitioning carbon .

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