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Following a uniform thinning, a young bigtooth aspen (Populusgrandidentata Michx.), quaking aspen (Populustremuloides Michx.), paper birch (Betulapapyrifera Marsh.), and red maple (Acerrubrum L.) stand was treated with nitrogen (N), phosphorus (P), and lime, singly and combined. Nitrogen increased the growth of all species. Lime and P also tended to increase the growth of bigtooth aspen and paper birch. Nitrogen increased mortality and lime reduced mortality. Quaking aspen suffered proportionally greater mortality than other species. The results suggest that both N and lime will be required for an optimum response of aspen and birch growing on acid spodosols in the Northeast, but the cause of and a means to avoid increased mortality caused by fertilizer needs to be determined before large-scale N fertilizer treatments are adopted.

Component biomass prediction equations are presented for young black spruce (Picea mariana B.S.P. (Mill,:)) in northern Maine. A weighted least squares model was used to construct the eq~iationsfo r small trees from 1 to 15 cm d.b.h., and an ordinary least squares model for trees less than 2 m in height. A linearized allometric model was also tested but was not used. Equations were developed for oven-dry needle, branch, bolewood, bolebark, aboveground, root, and complete tree biomass components. Aboveground components accounted for approximately 80 percent, and stump (less than 6 cm in height) plus roots accounted for 20 percent of the complete tree oven-dry biomass accumulation.