TAILIEUCHUNG - Báo cáo khoa học: "Use of pressure volume curves in water relation analysis on woody shoots: influence of rehydration and comparison of four European oak species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Use of pressure volume curves in water relation analysis on woody shoots: influence of rehydration and comparison of four European oak species. | Ann Sci For 1990 47 285-297 Elsevier INRA 285 Original article Use of pressure volume curves in water relation analysis on woody shoots influence of rehydration and comparison of four European oak species E Dreyer1 F Bousquet2 M Ducrey2 INRA Laboratoire de Bioclimatologie et d Scophysiologie Forestidres - _ _ Champenoux 54280 Seichamps 2 INRA Station de Sylviculture Méditerranéenne avenue Vivaldi 86000 Avignon France Received 7 November 1989 accepted 7 May 1990 Summary - Pressure volume analyses were undertaken on leafy shoots of 4 European oak species Quercus robur Q petraea Q pubescens and Q ilex in order to determine the relationship between leaf water potential average osmotic potential and volume averaged turgor. Some technical limitations of pressure volume analysis as shown by the influence of the resaturation method on computed turgor were overcome by accounting for losses of intercellular water during the first stages of dehydration. Variations in leaf to stem ratio which are very important between large leaved oaks and small leaved evergreens surprisingly did not influence the relative symplasmic volume of our samples. Differences in mean osmotic potential at full turgor IIo were related to species with higher values in drought adapted species and to leaf age and growing conditions. Values of volumetric modulus of elasticity e0 did not significantly influence the relations between leaf water potential CPw and turgor P in different species. This relationship was mostly related to Ho. Finally tolerance to drought appeared to be related more to the ability to osmotically adjust in response to changes in environment rather than to the absolute values of rio. water relations Quercus sp I water potential I turgor pressure-volume curve Résumé - utilisation de courbes pression volume dans analyse des relations hydri-ques de rameaux feu 11 lés influence de la réhydratation et comparison de quatre es-pèces de chênes européens. Une analyse des relations hydriques

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