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Biomass and growth (productivity) of Populustremuloides Michx. was determined from 20 × 20 m plots in 39 even-aged stands in northeastern Alberta. The diameters of all trees were measured at a 1.3-m height. In each stand, the periodic annual basal area increment (1977–1981) of 10–16 sample trees was proportional to the square of the diameter of each tree. This relationship was used to estimate the change in diameter of each tree in the stand for the 5-year period. The current biomass and the biomass per tree 5 years earlier were determined from an allometric equation of tree biomass versus diameter. A point estimate of growth over the last 5 years was determined by the difference between these values. Stands ranged from 23 to 57 years old, aboveground biomass from 37 to 156 t ha −1 , and current rates of production from 1.5 to 5.2 t ha −1 year −1 . Single tree cumulative biomass and growth were highest in low density and older stands. Stand biomass was highest in older stands but showed no relationship to stand density. Stand growth was not related to age, but was higher in more dense stands. There was no detectable reduction in growth near an SO 2 source in the study area.
Lleffers et al. (Mon,) studied this question.