Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Sensitivity of seedlings from different oak species to waterlogging: effects on root growth and mineral nutrition. | Ann Sci For 1991 48 193-204 Elsevier INRA 193 Original article Sensitivity of seedlings from different oak species to waterlogging effects on root growth and mineral nutrition M Colin-Belgrand 1 E Dreyer 2 p Biron 1 Laboratoire d Étude des Sols et de la Nutrition INRA Nancy Champenoux 54280 Seichamps 2 Laboratoire de Bioclimatologie et d Ecophysiologie Forestidre INRA Nancy Champenoux 54280 Seichamps France Received 16 August 1990 accepted 30 November 1990 Summary The tolerance of oak seedlings from 3 species Quercus robur Q rubra o palustris to a 7-wk period of waterlogging was tested under greenhouse conditions The seedlings had completed their height growth when treatments were applied. A permanent water table was maintained at 6 cm below the soil surface. Shoot growth root growth and mineral content of xylem sap P K Ca Mg and leaf tissues N p K Ca Mg s Mn were monitored weekly. Waterlogging had strong consequences on root development flooded roots decayed while hypertrophied lenticels and subsequently adventitious roots appeared on the taproot. Although the mineral nutrient content in xylem sap displayed significant differences between species no effect of waterlogging could be detected. But the combination of constant concentration and reduced transpiration in waterlogged seedlings probably resulted in a reduced nutrient flux to the leaves. Leaf nutrient contents decreased markedly in particular for total N and to a lesser extent for s and K but in all cases they remained well above deficiency levels. No phytotoxic accumulation of Mn could be detected. Important interspecific differences appeared. The development of root adaptations was much greater for o robur than for both Qpalustris and Q rubra probably indicating a higher tolerance to flooding in the former species. Surprisingly N and s concentrations decreased more in o robur than in both other species but this could be due to the fact that only Q robur continued leaf growth leading to a dilution of N in
