Radiação e liteira em ecossistemas de florestas com ocorrência de Attalea maripa (Aubl.) Mart.: estudo de caso na Amazônia oriental.

Abstract

Four fragments of natural forests were evaluated, being two primary and two secondary, in radiation of terms (PAR and red / far red transmitted through the canopy), litter and floristic characterization with emphasis on palm Attalea. maripa (Aubl.) Mart. Were marked four transects of 10 m x 300 m, one in each forest, leaving parallel to Projeto PLUPH'S experimental lots. In each transect, the central axis thereof, each 10 m alternately left and right has been defined a sampling point 2.5 m from the axis, resulting in 30 sampling points of radiation and litter. Primary forests had high species diversity, a greater amount of litter, improved efficiency in nutrient use and reduced transmissivity of photosynthetically active radiation and ratio red / far red compared to secondary forests. The A. maripa (Aubl.) Mart. occurred in greater quantity, when seedlings in the primary forests and at the stage of youth / adults in secondary forests.