POPULATION STRUCTURE OF Araucaria angustifolia IN THE IGUAÇU NATIONAL PARK

Autor:	Alci Albiero Junior, Lívia Godinho Temponi, Ana Tereza Bittencourt Guimarães, Franklin Galvão, Paulo Cesar Botosso
Rok vydání:	2015
Předmět:	Canopy Geography Ecology Aggregate distribution biology National park Natural forest Population structure Forestry biology.organism_classification Araucaria Nature and Landscape Conservation
Zdroj:	FLORESTA. 45:361
ISSN:	1982-4688 0015-3826
DOI:	10.5380/rf.v45i2.35673
Popis:	The aim of this study was to analyze the population structure, regeneration and spatial distribution of Araucaria angustifolia (Bertol.) Kuntz. within a natural forest and in forest edge with agricultural monoculture. All araucaria individuals from 10 cm high were recorded in 200 plots of 10 x 10 m. 479 individuals were sampled (416 at the edge and 63 inside). Of these, 33 were females, 37 males, 49 juveniles and 360 regenerating individuals. The population structure performance was similar to standard inverted-J. Regenerating individuals had mainly the aggregate distribution pattern, while juveniles, males and females had a uniform pattern. Density of the canopy affected frequency of the individuals, where higher frequencies at higher densities were observed, indicating that regeneration of this species is more effective in shadowed environments. Due to the large number of individuals sampled in different size classes, the Iguacu National Park is an important conservation remaining of A. angustifolia . Keyword: Density canopy; mixed temperate rain forest; spatial distribution; regeneration . Resumo Estrutura populacional de Araucaria angustifolia no Parque Nacional do Iguacu. O objetivo do presente trabalho foi analisar a estrutura populacional, regeneracao e distribuicao espacial de Araucaria angustifolia (Bertol.) Kuntz no interior de uma floresta natural e na borda de uma floresta com monocultura agricola. Todos os individuos de araucaria a partir de 10 cm de altura foram registrados em 200 parcelas de 10 x 10 m, sendo amostrados 479 individuos (416 na borda e 63 no interior). Desses, 33 eram femeas, 37 machos, 49 juvenis e 360 regenerantes. A estrutura da populacao apresentou padrao semelhante ao J-invertido. Os individuos regenerantes apresentaram principalmente o padrao agregado de distribuicao, ja para os juvenis, machos e femeas o padrao foi uniforme. A densidade do dossel influenciou a frequencia de individuos, sendo observadas maiores frequencias em maiores densidades, indicando que a regeneracao da especie e mais efetiva em ambientes sombreados. Devido ao grande numero de individuos amostrados em diferentes classes de tamanho, o Parque Nacional do Iguacu representa um importante remanescente na conservacao de A. angustifolia . Palavras-chave : Densidade do dossel; Floresta Ombrofila Mista; distribuicao espacial; regeneracao.
Databáze:	OpenAIRE
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