A Hypothesis Relating Current Annual Height Increment to Juvenile Wood Formation in Norway Spruce
Keywords:Juvenile wood, height increment, anatomical and physical properties, synchronous growth hypothesis
The relationship between current annual height increment and anatomical and physical wood properties was studied on material from two spacing experiments in Norway spruce [Picea abies (L.) Karst.] on good sites in southeastern Norway. The two experimental plots were clearfelled for wood analysis at 52 and 79 years of age, respectively.
The first experiment comprised three spacings (1.25 × 1.25, 1.75 × 1.75, and 2.25 × 2.25 m), but differences in stand density had been evened out by thinnings at an early stage. No significant relationship between basic wood density and initial spacing was found here. The second experiment comprised one spacing (5.5 × 3.0 m).
Current annual height increment culminated at the age of 18-19 years in the first experiment and at 28-29 years in the second experiment. In both experiments, a transition phase between formation of the juvenile wood and the mature wood at the stump height level (root-neck) clearly coincided with culmination of the current annual height increment.
This supports a synchronous growth hypothesis, which states that the formation of mature wood in the stump height area (root-neck) commences when the current annual height increment has culminated.
Assmann, E. 1961. Waldertragskunde. BLV München-Bonn-Wien.nBendtsen, A. B. 1978. Properties of wood from improved and intensively managed trees. Forest Prod. J. 28(10):61-72.nBendtsen, A. B., and J. Senft. 1986. Mechanical and anatomical properties in individual growth rings of plantation-grown eastern cottonwood and loblolly pine. Wood Fiber Sci. 18(1):23-38.nBouteije. J. 1968. Juvenile wood, with particular reference to northern spruce. Svensk Papperstidning 71(17):581-585.nBraastad, H. 1968. Interessant produksjonssammen-ligning i glissen og tett grankultur. Norsk Skogbruk 9:209-212.nBraastad, H. 1970. Et forbandsforsøk med gran. Meddelelser fra Det norske Skogforsøksvesen 28(5):295-329.nGreene, J. T. 1966. Selection for tracheid length in loblolly pine (Pinus taeda L.). Georgia Forest Research Council, Report No. 18.nKorf, V. 1939. Příspěvek k matematické definici vzrůstového zákona hmot lesních porostů. Lesnická práce. 18:339-379.nKorf, V. 1971. Růstové funkce. Pages 279-301 in M. Vyskot, ed. Základy růstu a produkce lesů. SZN, Praha.nKorpel', S. 1971. Rast, prírast a ívar jednotlivého stromu. Pages 157-213 in M. Vyskot, ed. Základy růstu a produkce lesů. SZN. Praha.nMichajlov, J. 1952. Mathematische Formulierung des Gesetzes für Wachstum und Zuwachs der Waldbäume und Bestände. Schweizerische Zeitschrift für Forstwesen, 103(9/10):368-380.nNicholls, J. W. P., and H. E. Dadswell. 1965. Assessment of wood qualities for tree breeding. Tech. Paper No. 37. CSIRO Division of Forest Products, Melbourne. Australia.nOlesen, P. O. 1971. The water displacement method. Forest Tree Improvement. Arboretet Hørsholm No. 3:3-23.nPanshin, A. J., and C. DeZeeuw. 1980. Textbook of wood technology, vol. 1, 4th ed. McGraw-Hill, New York, NY.nPokorný, J. 1963. Jehličnany lesů a parků. SZN, Praha.nPoleno, Z. 1977. Přírůstové a růstové funkce. Sborník Vědeckého lesnického ústavu Vysoké školy zemědělské v Praze, 20:117-150.nSenft, J. F., M. J. Quanci, and A. B. Bendtsen. 1986. Property profile of 60-year-old Douglas-fir. A technical workshop: Juvenile wood—What does it mean to forest management and forest products? Robertson D. Proceedings 47309, Forest Products Research Society, Madison, WI.nThörnqvist, T. 1990. Juvenile wood in coniferous trees. The Swedish University of Agricultural Sciences, Department of Forest-Industry-Market Studies, Uppsala, Sweden. Report No. 10.nZobel, B. 1976. Wood properties as affected by changes in wood supply of southern pines. Tappi 59(4):126-128.nZobel, B., and J. Talbert. 1984. Applied forest tree improvement. John Wiley and Sons, New York, NY.nZobel, B., R. C. Kellison, and D. G. Kirk. 1972. Wood properties of young loblolly and slash pines. Proceedings of the Symposium on the Effect of Growth Acceleration on the Properties of Wood. November 1971, Madison, WI.nZobel, B., C. Webb, and F. Henson. 1959. Core or juvenile wood of loblolly and slash pine trees. Tappi 42(5):345-356.n
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.