Effects of cold temperatures on breakage of lodgepole pine and white spruce twigs

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Twigs from lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) and white spruce (Picea glauca (Moench) Voss) trees were bent at a range of temperatures below 0°C using a two-point bending test. This was done to determine how cold temperatures might affect twig breakage and potential shoot and foliage loss in maturing conifer stands. The bending angle necessary to cause 50% twig breakage decreased linearly with decreasing temperatures for both species. No difference in the relationship between temperature and twig breakage was evident among species. Below –13°C, all breakage was on the tension side; at warmer temperatures there was compression damage to many twigs.

Des rameaux de pin tordu latifolié (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) et d'épinette blanche (Picea glauca (Moench) Voss) ont été pliés à différentes températures au-dessous de 0°C en ayant recours à un test de fléchissement en deux points. Cette expérience visait à déterminer de quelle façon les températures froides affectent le bris des rameaux et la perte potentielle de pousses et d'aiguilles dans les peuplements de conifères à mesure qu'ils vieillissent. L'angle de fléchissement qui entraîne le bris de 50% des rameaux diminue de façon linéaire avec la baisse de température chez les deux espèces. La relation entre la température et le bris des rameaux est semblable chez les deux espèces. Au-dessous de –13°C, tous les bris se sont produits du côté qui était sous tension. Plusieurs rameaux ont subi des dommages dus à la compression à des températures plus chaudes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2001

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