tailieunhanh - Báo cáo khoa học: "Growth, carbon dioxide assimilation capacity and water-use efficiency of Pinus pinea L"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Growth, carbon dioxide assimilation capacity and water-use efficiency of Pinus pinea L. | 91 Ann Sci For 1990 47 91 -100 Elsevier INRA Original article Growth carbon dioxide assimilation capacity and water-use efficiency of Pinus pinea L seedlings inoculated with different ectomycorrhizal fungi JM Guehl1 D Mousain 2 G Falconnet3 J Gruez 3 1 INRA Centre de Recherches de Nancy Laboratoire de Bioclimatologie-Ecophysiologie Forestidre Champenoux 54280 Seichamps 2 INRA Centre de Recherches de Montpellier Laboratoire de Recherches sur les Sym- biotes des Racines 34060 Montpellier 3 CEMAGREF Groupement d Aix-en-Provence Division des Techniques Forestldres Mdditer-randennes Le Tholonet 13610 Aix-en-Provence France Received 28 June 1989 accepted 8 January 1990 Summary - Three months after sowing seedlings of Pines pinea L grown in a nursery on a perlite-Sphagnum peat mixture were inoculated with different ectomycorrhizal fungi Rhizo-pogon roseolas and Suillus collinitus 2 strains 1 and 2 . The growth medium was maintained well-watered and was fertilized with a dilute Coĩc-Lesaint N p K 3 2 g r1 solution. Fertilization was stopped at the end of the first growing season October and growth and gas exchange parameters of the seedlings were assessed prior to the beginning of their second growth season. Inoculation with the 2 s collinitus strains led to the greatest plant elongation but biomass growth was greatest with R roseolas. Whole plant CŨ2 assimilation capacity in the R roseolas treatment was times that in the control treatment and times that in the s collinites 2 treatment. The plants infected by R roseolas and s collinites 1 had similar whole plant co2 assimilation capacities but root and total plant biomass were significantly higher in the R roseoles treatment. This difference could be due partly to greater carbon diversion by the fungal associate in the case of s collinites 1. Mean water-use efficiency WUE co2 assimilation rate transpiration rate of the inoculated seedlings pooled mean value mol kmol 1 was significantly P