Foliage and Wood Production in Unthinned Black Spruce in Northern Quebec
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.
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Document Type: Journal Article
Affiliations: Research Assistant, Pulp and Paper Research Institute of Canada, Montreal, Quebec
Publication date: 1964-03-01
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