Fiber Length, Tracheid Diameter, and Latewood Percentage in Norway Spruce: Development from Pith Outward
Keywords:
Norway spruce, <i>Picea abies</i>, <i>Picea abies</i> (L.) Karst, silviculture, crown development tree class, wood formation, wood characteristicsAbstract
In a fertilization trial near Stråsan, central Sweden, six net parcels of Norway spruce (Picea abies) planted in 1957 and clear-felled in the winter of 1989/1990 were used to evaluate the influence of growth conditions on wood characteristic development. The six parcels used in the study represented two unfertilized, two medium, and two heavily fertilized treatments. Suppressed, intermediate, and dominant trees were sampled from each parcel, and wood characteristics were determined from pith outwards on every second growth ring. Dependence of wood characteristic development was evaluated in models built on a limited set of growth factors that had a high predictive capability, yet were simple.
Tracheid length was found dependent on logarithm of cambial age and growth ring width, which gave an r2 = 0.87. Earlywood radial tracheid diameter was found dependent on logarithm of cambial age, growth ring width, and site quality, which gave an r2 = 0.67. Earlywood tangential tracheid diameter was found dependent on logarithm of cambial age, growth ring width, and site quality, which gave an r2 = 0.76. Latewood radial tracheid diameter was found dependent on logarithm of cambial age and site quality, which gave an r2 = 0.19. Latewood percentage was found dependent on logarithm of cambial age and growth ring width, which gave an r2 = 0.53. Basic density was found dependent on latewood percentage and the inverted value of earlywood radial tracheid diameter, which gave an r2 = 0.80. Results indicate that changes in growth conditions over time, acting through crown development, will influence wood structure development of Picea abies.
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