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Foliage and Wood Production in Unthinned Black Spruce in Northern Quebec

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In a pure, 65-year-old, upland stand of Picea mariana (Mill.) B.S.P., 20 trees were felled, measured, weighed and their crowns collected for drying and separation of needles and branches. Diameter tallies were made of adjacent sample plots. A computer was used to determine diameter class distributions of tree and stand components and some of their linear regressions with dbh and total dry needle weight per tree. The living trees contained 74,157 kg (oven-dry weight) of bole wood, 10,791 kg of live branches and 8,556 kg of needles per hectare. The needles had 9.8 ha of surface area per hectare about one-sixth being lost annually in mortality. The needle weight per tree was linearly related to stem volume increment and logarithms of needle weight, number, surface area. Crown volume increased linearly with the logarithm of tree diameter. Dominant trees were apparently less efficient producers of stem height and volume per unit weight of needles than suppressed trees; this lower efficency could not be related to a greater proportional live branch weight per unit weight of needles, nor was any ready differentiation noted between sun and shade needles. Dominant, intermediate and suppressed trees were estimated to have produced 0.26, 0.31 and 0.34 kg of dry stemwood per annum, representing 25, 62, and 13 percent, respectively, of the total stemwood growth in the last decade.

Document Type: Journal Article

Affiliations: Research Assistant, Pulp and Paper Research Institute of Canada, Montreal, Quebec

Publication date: March 1, 1964

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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