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Allocation of biomass and nutrients to current-year and one-year-old shoots and roots of two-year-old conifer seedlings with differing rates of growth was studied. Differences in growth rate were achieved by selecting fast- and slow-growing populations of the relatively fast- and slow-growing conifer species,  Pseudotsuga menziesii  (Mirb.) Franco and  Abies amabilis  Dougl. ex Loud, respectively. Environmentally controlled differences in growth rate were induced by placing half of the seedlings in a 10 °C growth chamber and half in a 20 °C growth chamber in their second growing season. Seedling samples were harvested in May, before the temperature treatment, and in July and November of the second growing season, and biomass and nutrient concentrations of current-year and one-year-old shoots and roots were determined.

Biomass and nutrient allocation in Douglas-fir and amabilis fir seedlings: influence of growth rate and temperature