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Responses to Phosphorus of Contrasting Successional Tree-Seedling Species from the Tropical Deciduous Forest of Mexico
P. Huante, E. Rincon and F. S. Chapin III
Vol. 9, No. 5 (Oct., 1995), pp. 760-766
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2390249
Page Count: 7
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1. We compared the growth responses of three early successional species, Cochlospermum vitifolium, Cordia alliodora and Heliocarpus pallidus, and the late successional Caesalpinia eriostachys, Caesalpinia platyloba, Jacquinia pungens and Recchia mexicana tree-seedling species to four concentrations (0, 2, 10 and 41 ppm) of phosphorus. The experiment was conducted over 50 days in pure silica sand inside growth chambers. 2. Mature-forest species had low relative growth rates and net assimilation rates, and showed little or no response, in growth and biomass allocation, to different P concentrations. 3. Early successional species had small seeds and higher responses in biomass allocation, growth and net assimilation rates to P availability, as well as a higher phosphorususe efficiency when P supply was low. 4. Species and treatment differences in growth rate generally corresponded more closely with patterns of net assimilation rate than with biomass allocation. The responsiveness of growth to P availability was negatively correlated with seed mass and P dependency.
Functional Ecology © 1995 British Ecological Society