PARTITIONING OF FLORISTIC-STRUCTURAL VARIATION OF THE TREE COMPONENT IN AN ALLUVIAL ARAUCARIA FOREST IN SOUTHERN BRAZIL/PARTICAO DA VARIACAO FLORISTICO-ESTRUTURAL DO COMPONENTE ARBOREO EM UMA FLORESTA OMBROFILA MISTA ALUVIAL NO SUL DO BRASIL

• Published in: Ciência florestal Vol. 28; no. 2; p. 554
• Main Authors: Loebens, Rodineli, da Silva, Ana Carolina, Higuchi, Pedro, Mafra, Alvaro Luiz, da Silva, Jessica Oneda, Goncalves, Didiane Ana, Souza, Karine, Cruz, Aline Pereira, Rodrigues, Luiz Carlos, Jr, Rosa, Angelica Dalla, Lima, Carla Luciane, Buzzi, Fernando, Jr
• Format: Journal Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 01.04.2018
• Subjects: Brasil
• ISSN: 1980-5098; 1980-5098
• DOI: 10.5902/1980509832038

This study aimed to evaluate the influence of spatial structure and environmental variables on floristicstructural organization of the tree component, in an Alluvial Araucaria Forest, in southern Brazil. To do so, 48 200 [m.sup.2] sampling units were allocated in the study area, located in the municipality of Lages, SC state. All trees within the sampling units, with diameter at breast height (dbh) equal to or greater than 5 cm were identified. The environmental and spatial variables were measured in each sampling unit. The data were analyzed through Mantel Correlogram, Variation Partitioning, Redundancy Analysis, analysis of Principal Coordinates of Neighbor Matrices and correlation tests. A total of 1,462 individuals, belong to 66 species, were sampled. Together, the environmental and spatial variables explained 24.13% of total variation, with the largest part (15.22%) being spatially structured. The significant environmental variables were topography (maximum elevation difference) and fertility (bases sum and P). It is possible to conclude that the tree component is organized as a floristic-structural gradient. Furthermore, the results suggest that the inundation regime and the presence of flood prone areas were relevant for micro-habitat definitions, that influenced the distribution of species. Keywords: Araucaria Forest; space influence; environmental characterization. Objetivou-se avaliar a influencia da estruturacao espacial e de variaveis ambientais sobre a organizacao floristico-estrutural do componente arboreo em urna Floresta Ombrofila Mista Aluvial no sul do Brasil. Para isso, foram alocadas 48 parcelas de 200 [m.sup.2] no remanescente amostrado, localizado em Lages-SC. Todos os individuos dentro das parcelas com diametro na altura do peito (DAP) igual ou superior a 5 cm foram identificados. Foram mensuradas variaveis ambientais e espaciais em cada parcela. Os dados foram analisados por meio de Correlograma de Mantel, Particionamento da Variancia, Analises de Redundancia, analise de Coordenadas Principais de Matrizes Vizinhas e testes de correlacao. Foram amostrados 1.462 individuos pertencentes a 66 especies. Conjuntamente, as variaveis ambientais e espaciais explicaram 24,13% da variacao total, sendo que a maior parte (15,22%) se encontrou espacialmente estruturada. Dentre as variaveis ambientais, a topografia (desnivel maximo) e a fertilidade do solo (soma de bases e P) foram significativas. Conclui-se que o componente arboreo esta organizado na forma de um gradiente floristicoestrutural. Ainda, os resultados sugerem que o regime de inundacao do rio e a presenca de zonas de maior encharcamento do solo foram relevantes na definicao de micro-habitat, que influenciaram na distribuicao das especies. Palavras-chave: Floresta com Araucaria; influencia espacial; caracterizacao ambiental.