DIVERSITY AND HORIZONTAL STRUCTURE OF AGROFORESTRY SYSTEMS IN MONTE ALEGRE, PARÁ

Abstract

ABSTRACT: The study of phytosociology is important for the evaluation of agroforestry systems, since it provides data that allow a more adequate management of the system. The objective of this work was to identify species and to characterize the horizontal structure and diversity of Agroforestry systems in the municipality of Monte Alegre, PA. Sample plots of 30 x 30 meters were installed, data of diameter at breast height, species and total height were collected. The studied system has six arrangements with different ages, in which its horizontal structure was analyzed through abundance, dominance, absolute and relative frequency, obtained from the data of individuals with DBH ? 5 cm. To obtain the diversity of species the Shannon-Weaver index (H ') was used. The evaluated SAFs obtained a total of 253 individuals, in 12 botanical families and 14 species. The Shannon-Weaver index (H ') was 2.28, which denotes intermediate species diversity in SAFs. The structural analysis showed that the brazilian mahogany (Swietenia macrophylla) was the species with the highest index of importance, while the african mahogany (Khaya ivorensis) obtained the highest index of coverage and absolute dominance. Coffee (Coffea arabica) was the species with the highest absolute density and teak (Tectona grandis) the species with the highest absolute frequency.KEYWORDS: Agroforestry, Forest arrangements, Phytosociology.