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Fertilization Response of Early and Late Successional Species: Acacia smallii and Celtis laevigata

The sequential dominance of Acacia smallii and Celtis laevigata during secondary succession may be explained in part by examining the nutrient requirements of these two species. Acacia smallii has a low soil N requirement, while C. laevigata has a high soil N requirement. Growth of A. smallii and C. laevigata seedlings on amended soil was determined in a greenhouse experiment by measuring the increase in number of leaves, leaf length, plant height, and biomass. Using a factorial design with N and a complete nutrient supplement minus N, we determined that A. smallii biomass was stimulated 1.35-fold by the addition of mineral nutrients minus N, but it was not stimulated by N. Celtis laevigata biomass increased 5.6-fold with the addition of NH4NO3 but not with the addition of other nutrients.