TAILIEUCHUNG - Báo cáo lâm nghiệp: " Effect of the root temperature on growth parameters of various European tree species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:" Effect of the root temperature on growth parameters of various European tree species. | Ann Sci For 1996 53 317-323 Elsevier INRA 317 Short note Effect of the root temperature on growth parameters of various European tree species H Lyr Institut fur Integrierten Pflanzenschutz der Biologischen Bundesanstalt fur Land- und Forstwirtschaft Kleinmachnow Stahnsdorfer Damm 81 14532 Kleinmachnow Germany Received 17 October 1994 accepted 2 November 1995 Summary European forest tree species have been investigated regarding the reaction of growth of shoots roots and leaves during an incubation of the root system at various temperatures ranging from 5 to 35 C for 4 months. Species-specific differences in the reaction to root temperatures could be demonstrated. Growth optima total dry mass increment ranged from about 15 C Picea abies Larix decidua Pseudotsuga menziesli Betula verrucosa to 25 C Quercus robur Carpinus betulus and up to 30 C Pinus nigra . Chilling of the root system of Juglans regia down to 2 C resulted in a rapid and long-lasting decrease of net photosynthetis but only in a moderate decrease of stomatai conductance and transpiration. Respiration was stimulated after some days. The ecological consequences of different optima for root temperatures among various species are discussed regarding their natural distribution and their reactions to increasing temperatures caused by the greenhouse effect. root temperature shoot growth I Quercus roburl Larix decidua I Picea abies Betula verrucosa Pseudotsuga menziesiil Carpinus betulus I Pinus nigra Acer pseudoplatanus Resume Effets de la temperature racinaire sur la croissance de diverses espèces ligneuses européennes. Les effets d une incubation du système racinaire à differentes temperatures 5 à 35 C pendant 4 mois sur la croissance aérienne de plusieurs espèces ligneuses ỉorestières européennes ont été analyses. D importantes differences interspecifiques ont été mises en evidence dans cette réponse. Les optima thermiques de croissance en biomasse totale allaient de 15 C Picea abies Larix decidua .

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