fenologia de espécies arbóreas zoocóricas em uma floresta psamófila no sul do brasil phenology of zoochorous tree species in a sandy coastal forest in southern brazil
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2007
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Abstract
Os fenômenos biológicos estão sujeitos a fatores abióticos que variam de acordo com a posição geográfica, especialmente relacionados à sazonalidade do ambiente. O presente estudo avaliou por dois anos as fenofases vegetativas e reprodutivas de nove espécies em uma floresta psamófila no sul do Brasil. Foram avaliados os eventos de queda foliar, brotamento, floração e frutificação em indivíduos localizados em diferentes pontos da área de estudo. A queda de folhas foi maior no mês de julho, sendo correlacionada com a menor temperatura média mensal e o menor comprimento do dia. As espécies apresentaram um aumento nas taxas de brotação após a queda foliar, atingindo maior atividade de setembro a novembro. Floração e frutificação apresentaram ritmos variados, sendo que houve maior produção de flores durante outubro e produção de frutos maximizada em novembro. A ausência de estação seca definida sugere que as espécies não experimentam restrições hídricas em intervalos regulares. Por outro lado, os eventos fenológicos vegetativos e reprodutivos estão estreitamente relacionados às variações anuais de temperatura média e comprimento do dia.
Biological phenomena are subject to abiotic factors that change according to geographical position, especially those related to environmental seasonality. This study provides a two-year assessment of vegetative and reproductive phenophases for nine species in a coastal forest on sandy soil in Southern Brazil. Changes in leaf fall, leaf flush, flowering and fruiting of trees from different locations within the fragment were evaluated. Leaf fall was higher in July and it was correlated with lower monthly average temperature and shorter day length. There was an increase of flushing rates after the highest leaf-fall activity from September to November. Flowering and fruiting had different rhythms; flower production was highest in October while fruit production was highest in November. The lack of a dry season suggests species do not experiment water-deficiency at regular intervals. On the other hand, vegetative and reproductive phenophases were related to variations in average temperature and day length throughout the year.
Biological phenomena are subject to abiotic factors that change according to geographical position, especially those related to environmental seasonality. This study provides a two-year assessment of vegetative and reproductive phenophases for nine species in a coastal forest on sandy soil in Southern Brazil. Changes in leaf fall, leaf flush, flowering and fruiting of trees from different locations within the fragment were evaluated. Leaf fall was higher in July and it was correlated with lower monthly average temperature and shorter day length. There was an increase of flushing rates after the highest leaf-fall activity from September to November. Flowering and fruiting had different rhythms; flower production was highest in October while fruit production was highest in November. The lack of a dry season suggests species do not experiment water-deficiency at regular intervals. On the other hand, vegetative and reproductive phenophases were related to variations in average temperature and day length throughout the year.
| Reference Key |
marchioretto2007actafenologia
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|---|---|
| Authors | ;Maria Salete Marchioretto;Julian Mauhs;Jean Carlos Budke |
| Journal | monatshefte für chemie chemical monthly |
| Year | 2007 |
| DOI |
10.1590/S0102-33062007000100018
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