Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:" The effects of ectomycorrhizal status on carbon dioxide assimilation capacity, water-use efficiency and response to transplanting in seedlings of Pseudotsuga menziesii (Mirb) Franco. | Ann Sci For 1990 21 551 -563 Elsevier INRA 551 Original article The effects of ectomycorrhizal status on carbon dioxide assimilation capacity water-use efficiency and response to transplanting in seedlings of Pseudotsuga menziesii Mirb Franco JM Guehl 1 J Garbaye 2 1INRA Centre de Recherches de Nancy Laboratoire de Bioclimatologie et d Ecophysiologie Forestidres 54280 Champenoux 2INRA Centre de Recherches de Nancy Laboratoire de Microbiologie Forestidre F 54280 Champenoux France Received 30 March 1990 accepted 5 December 1990 Summary One year-old Douglas fir seedlings mycorrhizal with Laccaria laccata or with Thele-phora terrestris and grown at two levels of phosphorus in the nutrient solution 10 and 40 mg-l 1 P were compared for water relations and gas exchange before and after transplanting in non-limiting water conditions. The results show that I L laccata is more efficient than T terrestris in increasing photosynthesis and water use efficiency ii phosphorus deficiency reduces photosynthesis and water use efficiency Hi the stimulating effect of L laccata on photosynthesis and water use efficiency is at least partly due to the improvement of phosphorus nutrition iv the photosynthesis reduction resulting from transplanting is due to a non-stomatal mechanism and v the recovery of photosynthesis involves the regrowth of the external mycelium of mycorrhizas. These results are discussed from the viewpoint of the plant-fungus relationships. ectomycorrhizae phosphorus nutrition co2 assimilation water-use efficiency I transplanting Résumé Effets du statut mycorhizien sur la capacité d assimilation de co2 I efficience d utilisation de J eau et la réponse à la transplantation de semis de Pseudotsuga menziesii Mlrb Franco. Des semis de 1 an de douglas mycorhizds par Laccaria laccata OU Thelephora ter-restris ont dtd elevds durant une saison de croissance à 2 niveaux de phosphore dans la solution nutritive 10 et 40 mg l 1P et ont été compards du point de vue des relations .
