TAILIEUCHUNG - Báo cáo khoa học: "Growth and morphology of pedunculate oak (Quercus robur L) and beech (Fagus sylvatica L) seedlings in relation to shading and drought"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Growth and morphology of pedunculate oak (Quercus robur L) and beech (Fagus sylvatica L) seedlings in relation to shading and drought. | AnnSciFor 1997 54 9-18 Elsevier INRA 9 Original article Growth and morphology of pedunculate oak Quercus robur L and beech Fagus sylvatica L seedlings in relation to shading and drought AFM van Hees Institute for Forestry and Nature Research IBN-DLO. PO Box 23. NL-6700 AA Wageningen the Netherlands Receveid 6 February 1995 accepted 19 April 1996 Summary - The effects of three intensities of shading in combination with drought on the growth and morphology of pedunculate oak and beech seedlings were studied in a pot experiment. The two species responded similarly to shading but had different reactions to drought. Shading reduced growth increased partitioning to stem and branches increased leaf area and reduced partitioning to fine roots. Drought reduced growth decreased partitioning to leaves and increased partitioning to fine root biomass. In beech drought increased the diameter of fine roots the increased partitioning to these roots did not increase fine root length. In oak. drought combined with high light resulted in less partitioning to stem and branches and increased partitioning to coarse roots. growth I morphology shading I drought biomass partitioning I specific leaf area specific root length Résumé - Croissance et morphologic de plants de chêne pédonculé Quercus robur L et de hêtre Fagns sylvatìca L en relation avec 1 ombrage et le dessèchement. Les effets d ombrage à diffcrents degrés - en combinaison avec un traitement de desscchemcnt - stir la croissance et la morphologic de plants de chêne pédonculé Ct de hêtre ont etc étudiés en conditions experimentales. La reaction du chêne Ct du hetre s est trouvee idenlique à Tombrage mais elle clait difierentc quant au dessèchement. L ombrage réduit la croissance mais il augmente I allocation de maticre sèchc à la tige et aux branches de meme qu au fcuillage mais il la reduil pour les racincs d unc diametre de 2 mm. Le dessèchemcnl réduil la croisssance el 1 allocalion de malière sèche à la biomasse foliacee mais

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