Floresta e Ambiente
http://floram.org/article/doi/10.1590/2179-8087.024115
Floresta e Ambiente
Original Article Forest Products

Fenologia Vegetativa e Crescimento de Cedrela fissilis na Floresta Atlântica, Paraná, Brasil

Vegetative Phenology and Growth of Cedrela fissilis in Atlantic Forest, Southern Brazil

Fernando Andreacci; Paulo Cesar Botosso; Franklin Galvão

Resumo

RESUMO: A fenologia, o incremento em circunferência do tronco e a atividade cambial de indivíduos de Cedrela fissilis (Meliaceae) foram observados mensalmente em duas tipologias de Floresta Ombrófila (Densa e Mista) na Floresta Atlântica, Estado do Paraná, Brasil. As observações se deram por meio do método de índice de atividade, leitura de incremento em circunferência do tronco com o uso de dendrômetros permanentes e amostragens periódicas de tecido cambial de 24 árvores da espécie. O ritmo de incremento observado é sazonal, iniciando-se após a expansão total do limbo e interrompendo-se quando as folhas maduras estão em senescência adiantada e/ou em sua ausência. Análises estatísticas mostraram relações significativas entre incremento, variáveis climáticas e fenologia. A espécie apresenta formação de anéis anuais de crescimento, sendo observadas flutuações anatômicas intra-anuais. Os resultados indicam que a fenologia vegetativa dos indivíduos parece ser influenciada mais fortemente pelo fotoperíodo e temperatura do que pela precipitação.

Palavras-chave

floresta ombrófila, dendrômetros, atividade cambial

Abstract

ABSTRACT: Phenology, girth trunk increment and cambial activity of Cedrela fissilis (Meliaceae) individuals were monthly evaluated in two distinct units of the Atlantic Forest (Ombrophilous Dense and Mixed forests), in the state of Paraná, Brazil. Readings of 24 individuals were assessed by activity index, permanent band dendrometers, and periodic samplings of cambial tissue. The girth increment rhythm is seasonal, it begins after total leaf blade expansion and is suspended when mature leaves are in advanced senescence and/or absent. Statistical analysis shows significant relationships between girth increment, climatic variables and phenology. The species presents annual growth rings and intra-annual anatomical fluctuations. Its vegetative phenology seems to be more strongly driven by day length and temperature than by precipitation.
 

Keywords

ombrophilous forest, dendrometers, cambial activity

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