Aboveground and belowground biomass and sapwood area allometric equations for six boreal tree species of northern Manitoba

Allometric equations were developed relating aboveground biomass, coarse root biomass, and sapwood area to stem diameter at 17 study sites located in the boreal forests near Thompson, Man. The six species studied were trembling aspen (Populus tremuloides Michx.), paper birch (Betula papyrifera Marsh.), black spruce (Picea mariana (Mill.) BSP), jack pine (Pinus banksiana Lamb.), tamarack (Larix laricina (Du Roi) Koch.), and willow (Salix spp.). Stands ranged in age from 4 to 130 years and were categorized as well or poorly drained. Stem diameter ranged from 0.1 to 23.7 cm. Stem diameter was measured at both the soil surface (D0) and breast height (DBH). The relationship between biomass and diameter, fitted on a log-log scale, changed significantly at 3 cm DBH, suggesting that allometry differed between saplings and older trees. To eliminate this nonlinearity, a model of form log 10 Y = a + b(log10 D )+ c(AGE) + d(log10 D × AGE) was used, where D is stem diameter, AGE is stand age, and the cross prod- uct is the interaction between diameter and age. Most aboveground biomass equations (N = 326) exhibited excellent fits (R 2 > 0.95). Coarse root biomass equations (N = 205) exhibited good fits (R 2 > 0.90). Both D0 and DBH were ex- cellent (R 2 > 0.95) sapwood area predictors (N = 413). Faster growing species had significantly higher ratios of sap -

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