Natural variation in merchantable stem biomass and volume among clones of Populustremuloides Michx.

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Abstract
Stand density and biomass and volume of merchantable stems were determined and compared for six clones on each of two different sites in Alberta. One site (Blue Ridge) was typically boreal and the other (Nordegg) subalpine. Biomass and volume production at 5 years were significantly different among clones on a shared site and were also significantly different when individual trees were compared between sites. Stocking levels were significantly higher on the Nordegg site at 85 years but not high enough to prevent the Blue Ridge site from producing more biomass (six and a half times as much) and volume (four times as much) on an areal basis. Broad sense heritability estimates suggest that approximately one-third of the variation in biomass and volume of trees growing on each site was genetically based.

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