. The Canadian field-naturalist. Natural history. IBI 524 The Canadian Field-Naturalist Vol. 116 varies between 50 and 100 cm during winter in southeastern Quebec (, Dumont et al. 2000). When stratifying the vegetation likely to serve as food or cover for White-tailed Deer and hare, we then used three practical thresholds for height class- es: 30 cm, 50 cm, and 150 cm. Methods exist to estimate vegetation volume or biomass quickly with auxiliary variables which can be measured rapidly (, Bonham 1989; Crete et al. 1990b), but none were adapted to our needs. In this study, we wanted to d
. The Canadian field-naturalist. Natural history. IBI 524 The Canadian Field-Naturalist Vol. 116 varies between 50 and 100 cm during winter in southeastern Quebec (, Dumont et al. 2000). When stratifying the vegetation likely to serve as food or cover for White-tailed Deer and hare, we then used three practical thresholds for height class- es: 30 cm, 50 cm, and 150 cm. Methods exist to estimate vegetation volume or biomass quickly with auxiliary variables which can be measured rapidly (, Bonham 1989; Crete et al. 1990b), but none were adapted to our needs. In this study, we wanted to determine whether we could pre- dict, with simple and rapid measurements, plant biomass growing in the m stratum for mixed and coniferous forests of varying ages in south-eastern Quebec. As we tallied 214 taxa of herbs and woody species in the deer range in Quebec (Boucher 2003), we had to pool species based on their growth form to obtain adequate sample sizes for each regression model. Study Area and Field Methods We studied plant biomass in the Bas-Saint- Laurent (-48° 00' N; =69° 00' W) and Monteregie (=46° 00' N; =73° 00' W) regions of Quebec during the growing seasons of 1998 and 1999. The Bas- Saint-Laurent region occupies a transition zone between the northern hardwood forest and the boreal forest; Sugar Maple (Acer saccharum) and Yellow Birch (Betula alleghaniensis) often grow on hilltops and well-drained hillsides, whereas Balsam Fir (Abies balsamea). White and Black spruce (Picea glauca, P. mariana) frequently dominate with Trembling Aspen (Populus tremoloides) and White Birch (Betula papyriferd) elsewhere (Rowe 1972). Most forest stands have been affected by logging, insect epidemics, or fire during the last century. The milder climate in Monteregie favours the growth of a greater variety of tree species, including Sugar Maple, Yellow Birch, White Ash (Fraxinus ameri- cana), American Linden (Tilia americana), Ironwood (Ostrya virginiana). White Pine (Pinus s
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