LANDSCAPE ELEMENTS AS A SOURCE OF FLORISTIC-STRUCTURAL HETEROGENEITY OF THE TREE COMPONENT IN AN AREA OF OMBROPHILOUS MIXED FOREST/ ELEMENTOS DA PAISAGEM COMO FONTE DE HETEROGENEIDADE FLORISTICOESTRUTURAL DO COMPONENTE ARBOREO EM AREA DE FLORESTA OMBROFILA MISTA

• Published in: Ciência florestal 2018-04, Vol.28 (2), p.661
• Main Authors: Higuchi, Pedro, da Silva, Ana Carolina, Spiazzi, Fabio Rodrigues, Negrini, Marcelo, Neto, Silvio Luis Rafaeli, Bento, Marco Antonio, Mores, Diego Felipe, de Aguiar, Manoela Drews, Buzzi, Fernando, Jr, da Silva, Andre Leonardo
• Format: Article
• Language: Portuguese
• ISSN: 1980-5098; 1980-5098
• DOI: 10.5902/1980509832061

This study aimed to test the hypothesis that different landscape elements, such as corridors, connected and non-connected forest fragments, have a tree component with floristic-structural differences. For this sake, the tree component of a fragment-corridor system was sampled by permanent plots (10 x 20 m), totaling an area of 1.4 ha. Within the plots, tree individuals with the circumference at breast height (cbh) greater than 15.7 cm, which botanical identities were determined in the field, were sampled and counted. The landscapes metrics (fragment size area, nearest neighbor distance and edge-interior relation) were extracted from a LANDSAT image, by FRAGSTAT software. The organization and richness of the tree component in the landscape were analyzed through Non-Metric Multidimensional Scaling (NMDS), non-parametric multivariate variance analysis (NPMANOVA), Jaccard and Bray-Curtis dissimilarities indices, rarefaction, Venn diagram and indicator species analysis. Three non-connected fragments, two connected fragments and two forest corridors were recognized. In these landscape elements, a total of 84 species, 60 genera and 36 botanical families were found. The most floristically distinctive landscape element was the corridor. The hypothesis that the different landscape elements have a tree component with floristic-structural differences was accepted, supporting the idea that the spatial organization of forest fragments and corridors is relevant for the organization of tree vegetation in a landscape scale. Keywords: Araucaria Forest; forest fragmentation; landscape ecology; edge effect. O presente estudo teve como objetivo testar a hipotese de que os diferentes elementos da paisagem, como os corredores, fragmentos conectados e fragmentos nao conectados, apresentam o componente arboreo com composicao floristico-estrutural diferentes entre si. Para isto, o componente arboreo de um sistema de fragmentos e corredores florestais foi amostrado por meio de 70 parcelas permanentes de 10 x 20 m, totalizando 1,4 ha amostrado. Dentro das parcelas, foram identificados e quantificados os individuos arboreos com circunferencia a altura do peito (CAP) maior ou igual a 15,7 cm. As metricas da paisagem (area, distancia do vizinho mais proximo e relacao borda interior) foram extraidas de imagem LANDSAT, por meio do programa FRAGSTAT. A organizacao e a riqueza do componente arboreo na paisagem foram avaliadas por meio do Escalonamento Multidimensional Nao metrico (NMDS), da