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Differences in Growth and Nutrient use Among Arctic Plant Growth Forms
F. S. Chapin, III and G. R. Shaver
Vol. 3, No. 1 (1989), pp. 73-80
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2389677
Page Count: 8
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Deciduous species (graminoids, forbs and deciduous shrubs) completed accumulation of biomass, nitrogen (N) and phosphorus (P) in new leaves and current-year's twigs by midsummer in arctic Alaska, whereas these processes continued throughout the growing season in the same tissue of evergreen shrubs. N- and P-use-efficiency increased from deciduous species to evergreen shrubs to lichens and mosses. Fertilization with N-plus-P had no effect on N-use-efficiency in deciduous leaves but caused a decline in N-use-efficiency in evergreen leaves, mosses and lichens. P-use-efficiency declined with nutrient addition in leaves of all growth forms. Approximately half of the maximum pools of leaf N and P were withdrawn from leaves prior to autumn senescence, but this resorption was unaffected by nutrient addition treatment or by growth form.
Functional Ecology © 1989 British Ecological Society