Reabsorção de nutrientes por espécies arbóreas acumuladoras de fósforo na Amazônia: influência na qualidade da serrapilheira.

Abstract

The importance of knowing the concentrations and the supplies of nutrients as phosphorus (P) and the nitrogen (N) in the produced litter by potentially accumulative species of phosphorus in secondary forests whose soils are deficient in this nutrient must of the necessity to identify mulch of quality for the technology of chop and mulch recently practised for shift Agriculture of State of Pará. Of this form, the contents and the supplies of phosphorus and nitrogen found in the leaf litter of Neea macrophylla had been superior to the ones of Cecropia palmata and Casearia arborea, suggesting that optimum litter it would be produced for Neea. However, the species with better capacity of phosphorus retranslocation of senescentes leaves for mature leaves was Cecropia palmata, suggesting a strategy of economy of the nutrient in natural stress conditions. For the nitrogen, the retranslocations had been very low for the three species, signaling that this nutrient seems not be in deficit.