TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effects of elevated carbon dioxide on leaf gas exchange and growth of cork-oak (Quercus suber L) seedlings "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Effects of elevated carbon dioxide on leaf gas exchange and growth of cork-oak (Quercus suber L) seedlings . | Ann Sci For 1996 53 461-467 Elsevier INRA 461 Short note Effects of elevated carbon dioxide on leaf gas exchange and growth of cork-oak Quercus suber L seedlings c Damesin c Galera s Rambal R Joffre Centre d ecologie fonctionnelle et evolutive CNRS BP 5051 34033 Montpellier cedex 01 France Received 18 November 1994 accepted 31 October 1995 Summary Leaf gas exchange and growth were determined on cork-oak Quercus Suber L seedlings which were grown from acorns for periods of up to 4 months in greenhouses at ambient 350 pmol mol-1 and at elevated 700 pmol mob1 concentrations of carbon dioxide. In well-watered conditions daily maximum photosynthesis 15 pmol m-2 S 1 and stomatai conductance 440 mmol m-2 S 1 of plants grown and measured at 700 pmol mol-1 co2 did not differ from those of plants grown and measured at 350 pmol mol-1. In conditions of moderate drought net co2 assimilation was at least twice as great in elevated co2 but stomatai conductance was unchanged. Elevated co2 affected total biomass production the average increase being 76 and 97 at 3 and 4 months respectively. Shoot biomass root biomass stem height and total leaf area were increased by elevated co2. Root and stem ramification were also enhanced by elevated co2 but no change in root shoot ratio was observed. Quercus suberI carbon dioxide photosynthesis stomatai conductance growth Resume Effets d une augmentation du co2 atmosphérique sur les échanges gazeux et la crois-sance de plantules de chêne-liège Quercus suber L . Des mesures de croissance et d echanges gazeux ont été menées sur des plantules de chêne-liège Quercus suber L de 3 et 4 mois qui ont grand avec une concentration en dioxyde de carbone de 350 pmol mob1 OU de 700 pmol mob1. Dans des conditions non limitantes en eau la photosynthèse 15 pmol rrr2 s 1 et la conductance stomatique 440 mmol rrr2 s 1 maximales journalieres mesurées avec la concentration de co2 de croissance n etaient pas differentes entre les deux traitements. En conditions de

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp