TAILIEUCHUNG - Báo cáo lâm nghiệp: " Partitioning of remobilised N in young beech (Fagus sylvatica L.) is not affected by elevated [CO2]"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Partitioning of remobilised N in young beech (Fagus sylvatica L.) is not affected by elevated [CO2]" | Ann. For. Sci. 62 2005 285-288 INRA EDP Sciences 2005 DOI forest 2005021 285 Note Partitioning of remobilised N in young beech Fagus sylvatica L. is not affected by elevated CO2 Jens DYCKMANSa b Heiner FLESSAc a Centre for Stable Isotope Research and Analysis Forest Ecosystems Research Centre University Gottingen Busgenweg 2 37077 Gottingen Germany b Environmental Resource Management Faculty of Agriculture University College Dublin Belfield Dublin 4 Ireland c Institute of Soil Science and Forest Nutrition University Gottingen Busgenweg 2 37077 Gottingen Germany Received 13 May 2004 accepted 27 September 2004 Abstract - Effects of elevated CO2 concentration CO2 on the remobilisation of tree internal nitrogen N of 3-year-old beech Fagus sylvatica L. was determined in a labeling experiment. Trees were pre-treated with 15N for 1 year and the remobilization of stored N was monitored in ambient 350 ppm or elevated CO2 700 ppm in the subsequent year. N taken up during the pre-treatment made up of total N at the start of the experiment. This value was almost halved after 24 weeks of growth for both CO2-treatments. Significant differences in the partitioning of the remobilized N were only observed transiently after 6 weeks of growth but no CO2-effect was observed at the end of the growing season. elevated carbon-dioxide N cycling N partitioning remobilization stable isotope Résumé - La partition de N remobilisé chez de jeunes hêtres Fagus sylvatica L. n est pas affectee par une concentration élevée en CO2. Les effets de concentrations élevées en CO2 sur la remobilisation de l azote interne de plants de hêtre Fagus silvatica L. âgés de 3 ans ont été étudiés dans une expérimentation avec marquage. Les arbres ont été prétraités avec du a5N pendant un an et la remobilisation de l azote stocké a été suivie a des concentrations de 350 ppm et de 700 ppm l année suivante. L azote fixé pendant le prétraitement correspond à 24 7 de l azote total au début de l .

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