VARIABILIDADE ESPACIAL EM SISTEMA AGROFLORESTAL SILVIBANANEIRO, NO LITORAL DO RIO GRANDE DO SUL, COM gvSIG

Abstract

Agroforestry systems (SAF) are important alternatives to generate income from sustainable agriculture, like the SAF in the North Coast of  Rio Grande do Sul, Brazil. However, there are still few studies that use the precision agriculture or forest approach, using the spatialization of attributes of the vegetation of the SAF, this being the objective of this paper. An inventory was carried out in a silvibanan SAF located in Três Cachoeiras, RS, Brazil, and 33 sample units (su) were installed to measure tree individuals with CBH >15 cm. The su were georeferenced, locating the phytosociological parameters, which were interpolated by weighting the inverse of the distance (IDW) in the gvSIG, which together with the SAF limits gave rise to maps of spatial variability. The main species observed was juçara palm (Euterpe edulis Mart. - Family Arecaceae) with 75 individuals sampled, with relative dominance, frequency and density of 17, 22.2 and 37%, respectively, and importance of 76.2%. The variables that showed evident spatial variability were number of species, maximum diversity, the index diversity, dominance and equability, number of palm trees and bunches of green banana. In conclusion, the attributes of the SAF silvibananeiro have spatial variability and that the methodology used was adequate.