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Growth, wood chemistry, and fibre length of Norway spruce in a long-term nutrient optimization experiment

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The study was performed as part of a nutrient optimization experiment at Asa in southern Sweden. The experiment was established 1987, in a Norway spruce (Picea abies (L.) Karst.) stand planted in 1975. In the nutrient optimization treatment (IL), all essential macro- and micronutrients were supplied, with irrigation water, every second day during the growing season. In October 2003, nine trees were harvested on both untreated control and IL plots. The IL treatment increased annual ring width during the first years of the experiment by ca. 30% and cumulative cross-sectional area 1.5-fold by the end of the experiment. Tracheid length was, however, not affected by the IL treatment. The nitrogen concentration of wood increased and starch concentration decreased as an effect of the IL treatment, suggesting that carbon was allocated to growth rather than storage. The IL treatment increased lignin concentration of wood by 3.4%. Chemical composition varied at different heights along the stem, but with no apparent trend.

Cette étude a été réalisée dans le cadre d’une expérience d’optimisation des nutriments à Asa dans le sud de la Suède. L’expérience a été établie en 1987, dans un peuplement d’épicéa commun (Picea abies (L.) Karst. ) planté en 1975. Dans le traitement d’optimisation des nutriments (IL), tous les macro et micro-nutriments essentiels ont été appliqués dans l’eau d’irrigation à tous les deux jours durant la saison de croissance. En octobre 2003, neuf arbres ont été récoltés dans les parcelles témoins non traitées et les parcelles IL. Le traitement IL a augmenté la largeur du cerne annuel d’environ 30 % durant la première année de l’expérience et la surface radiale cumulative d’un facteur de 1,5 à la fin de l’expérience. La longueur des trachéides n’a cependant pas été affectée par le traitement IL. La concentration en azote dans le bois a augmenté et la concentration en amidon a diminué sous l’effet du traitement IL indiquant que l’allocation du carbone était dirigé vers la croissance plutôt que l’accumulation de réserves. Le traitement IL a augmenté de 3,4 % la concentration de la lignine dans le bois. La composition chimique variait selon la hauteur dans la tige mais aucune tendance n’était apparente.

Document Type: Research Article

Publication date: February 1, 2009

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