Influence of progeny and initial stand density on the relationship between diameter at breast height and knot diameter of Picea abies.The diameter of the knots in every second whorl was measured in 26 trees of Picea abies (L.) Karst. in north-eastern France. The trees were of two French progenies, i.e. from the provenance La Ganne in Massif Central and from Morzine in the Alps. The trees were planted in 1970 with initial stand densities ranging from 200 stems ha − 1 to 10 000 stems ha − 1 . The trees were felled and measured in 1997. Knot diameter was evaluated as mean diameter of the three thickest knots at different height intervals and as a vertical profile of the maximum knot diameter in each sample whorl. In all these cases, we found the knot diameter to be correlated with diameter at breast height. The additional effects of progeny and initial stand density were found to be significant, but slight compared to the effect of diameter at breast height.
Knot diameters were measured in 60 trees of Picea abies (L.) Karst. from three different site indexes in southeastern Norway. Ten branch whorls were sampled from each tree, and diameters of all the knots were measured at the radial stem plane. Knot diameter was evaluated as mean diameter of the two thickest knots in each sample whorl. The whorl with the maximum value in each tree was on average located at 30% of tree height at G11, 40% at G17 and 60% at G23. The vertical location was related to the position of the crown base, and single tree models for predicting the position and the value were constructed. Knot diameter in the butt log, i.e. in the lower 30% of tree height, was related to annual ring width and site index, and to diameter at breast height and site index.
Scha Ètzung des Astdurchmessers in Picea abies (L.) KarstAstdurchmesser wurden an 60 Fichten gemessen, die auf drei verschiedenen Standorten im Su Èdosten Norwegens wuchsen. Zehn Astquirle wurden von jedem Baum entnommen. Die Astdurchmesser wurden in radialer Stammebene gemessen. Der Astdurchmesser wurde gescha Ètzt als mittlerer Durchmesser der zwei dicksten A È ste in jedem Quirl. Der Quirl mit den dicksten A È sten war im Mittel bei 30% der Baumho Èhe positioniert (Standort G17) bzw. bei 40% (Standort G17) und 60% (G23). Die vertikale Position wurde in Beziehung gesetzt zum Kronenansatz. Daraus wurde ein Modell zur Scha Ètzung der Position und des Mittelwertes fu Èr jeden einzelnen Baum entwickelt. Astdurchmesser im Erdstammabschnitt, d.h. unterhalb 30% der Gesamtho Èhe war einerseits korreliert mit der Jahrringbreite und dem Standort-Index, andererseits mit dem Brustho Èhen-Durchmesser und dem Standort-Index.
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