PHENOLOGY & GROWING OF ACCUMULATIVE PHOSPHORUS SPECIES IN THE AMAZON

The phenological characterization of phosphorus (P) accumulative species as Neea macrophylla and Cecropia palmata and not accumulative, Casearia arborea, is basic for understanding P dynamics of the different compartments of plants and in specific periods of the year in secondary forests in Northeast Para. The phenology understanding can allow them to define in the time the amount and the quality of annual litter produced by such species in function of the activity and intensity of phenophases. In the same way the Quantitative Analysis of Leaf Growth can come to justify Photosynthetic Taxes and Phosphorus Photosynthetic - Use Efficiencies (PPUE) through the determination of Specific Leaf Area (SLA), Reason of Leaf area (RAF) and Reason of Leaf Weight (RPF). The results had demonstrated that three species had inside presented 100% activity of phenophases disclosing a certain synchronism of each species, but not between them, signaling certain heterogeneity in secondary forest studied where the biotic factor seemed to prevail on the abiotic. A trend of increase Photosynthetic Tax was observed with increase of Specific Leaf Area of the species; even so Casearia arborea has kept low AFE and high Photosynthetic Tax. Cecropia palmata was the species that needed higher leaf area for 1gr of dry matter