Aporte e decomposição de serapilheira em áreas de floresta secundária, plantio de sabiá (Mimosa caesalpiniaefolia Benth.) e andiroba (Carapa guianensis Aubl.) na Flona Mário Xavier, RJ

Abstract

This study evaluated litter production and decomposition in areas of spontaneous secondary forest, sabiá (Mimosa caesalpiniaefolia Benth.) and andiroba (Carapa guianensis Aubl.) plantation. For litter contribution evaluation, 10 conical collectors were installed, and the contribution was evaluated from October, 2003 to September, 2004. N, P and K contents were quantified in litter. To evaluate decomposition, rate litter bags method was used. In the andiroba plantation area, it was observed the higher litter amount 9,20 Mg ha-1, followed by the sabia plantation with 9,06 Mg ha-1 and spontaneous secondary forest 7,63 Mg ha-1. Sabiá and andiroba litter presented larger nitrogen and phosphorus values in relation to the secondary forest area. Litter decomposition rate was faster in sabiá and andiroba areas. This behavior might be influenced by larger nitrogen content in the litter. Phosphorus was the nutrient that presented the higher liberation rate.