Structure of the tree component of a riparian seasonal decidual forest in Jaguari, RS, Brazil/Estrutura do componente arboreo de uma floresta estacionai decidual riparia em Jaguari, RS
This study analyzed the tree component structure of a riparian seasonal decidual forest, in Jaguari, RS. Data was collected in 15 10m x 10m-plots randomly assigned along the riparian forest of a Jaguari river tributary In these plots trees showing DBH equal or above 5cm were identified and measured....
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Published in: | Ciência rural Vol. 42; no. 2; p. 305 |
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Main Authors: | , , , , , |
Format: | Journal Article |
Language: | Spanish |
Published: |
Universidade Federal de Santa Maria
01-02-2012
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Online Access: | Get full text |
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Summary: | This study analyzed the tree component structure of a riparian seasonal decidual forest, in Jaguari, RS. Data was collected in 15 10m x 10m-plots randomly assigned along the riparian forest of a Jaguari river tributary In these plots trees showing DBH equal or above 5cm were identified and measured. Podocarpus lambertii, Sebastiania commersoniana and Lithrea molleoides were the most representative species of the riparian forest. The tree diameter distribution in general and for the species with the higher importance value index showed the inverted "J" trend, typical of uneven-aged forests, and unbalanced structure resulting from different mortality and recruitment rates. The vertical and height species structure showing the highest importance value tended to normal distribution, with most of the individuals positioned in or close to the average height class. Key words: phytosociology, tree stratum, community structure, riparian forest, southern plateau. Este estudo analisou a estrutura do componente arboreo de uma mata ciliar, no municipio de Jaguari, RS. A amostragem foi realizada em 15 parcelas de 10m x 10m instaladas ao longo da mata ciliar de um afluente do rio Jaguari. Nessas parcelas, foram identificados e medidos os individuos com diametro a altura do peito (DAP) maior ou igual a 5cm. Podocarpus lambertii, Sebastiania commersoniana e Lithrea molleoides foram as especies mais representativas da mata ciliar. A distribuicao diametrica do componente arboreo e das especies lenhosas de maior valor de importancia (VI) seguiu o padrao comum a florestas inequianias, com tendencia a forma de "J" invertido, e revelou uma estrutura nao balanceada, indicando que nao ha equilibrio entre as taxas de mortalidade e recrutamento de individuos. A estrutura vertical e as especies de maior VI apresentaram tendencia a distribuicao normal, com a maioria dos individuos posicionada nas classes intermediarias de altura. Palavras-chave: fitossociologia, estrato arboreo, estrutura de comunidade, floresta estacional, planalto meridional. |
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ISSN: | 0103-8478 |