Fenologia de espécies do dossel e do sub-bosque de duas Florestas de Restinga na Ilha do Mel, sul do Brasil

Marques, Márcia C. M.; Oliveira, Paulo Eugênio

doi:10.1590/s0100-84042004000400011

Cited by 64 publications

(85 citation statements)

References 22 publications

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“…Leaf fall was also found to be negatively correlated with temperature, rainfall and day length in an average of three months prior in phenological studies at a coastal plain forest (Restinga), nearby the present study area (Marques & Oliveira 2004) and in other Atlantic Rain Forest types . In both studies, the highest leaf fall was also registered at the beginning of the rainy season.…”

Section: Meteorological Variablessupporting

confidence: 60%

“…This ensures an increase in productivity during the most favorable climatic conditions during the warmest and wettest season (van Schaik et al 1993). In fact, it seems to occur a synchrony among the maximum quantity of newly formed leaves and maximum rainfall, photoperiod and temperatures, as observed by Morellato et al (2000), and Marques & Oliveira (2004).…”

Section: Meteorological Variablesmentioning

confidence: 94%

“…Spearman's rank correlation coeffi cients (r s ) were calculated according to Zar (1999) to correlate litter components produced along the months (considering the mean of the two sites due to the similar behavior and to simplify the results) with meteorological variables. Similar non-parametric correlations are also used in many phenological and litterfall studies , Marques & Oliveira 2004, Chapman et al 2005.…”

Section: Methodsmentioning

confidence: 99%

“…Many phenological and litterfall studies used correlations to detect synchronies among biological and meteorological cycles, without the pretension of explaining relations of cause and effect through these analyses , Marques & Oliveira 2004, Chapman et al 2005. According to Morellato et al (2000) those relationships remain ambiguous for tropical forests under less and non-seasonal climates where even simple patterns of fl owering, fruiting or formation of new leaves are hardly understood, much less the interaction of these patterns with successional dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil

Scheer¹,

Gatti²,

Wisniewski³

et al. 2009

Rev. bras. Bot.

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-(Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil). Above-ground litter production is one of the most accessible ways to estimate ecosystem productivity, nutrient fl uxes and carbon transfers. Phenological patterns and climatic conditions are still not fully explained well for tropical and subtropical forests under less pronounced dry season and non-seasonal climates, as well as the interaction of these patterns with successional dynamics. Monthly litterfall was estimated for two years in a 9 to 10 year old secondary alluvial Atlantic Rain forest. Total litterfall was higher in the site with more developed vegetation (6.4 ± 1.2 ton ha -1 year -1 ; 95% confi dence interval) as compared to the site with less developed vegetation (3.0 ± 1.0 ton ha -1 year -1 ). The monthly production of 11 litter fractions (eight fractions comprising the leaf litter of the seven main species of the community and other species; reproductive parts, twigs ≤ 2 cm diameter, and miscellaneous material) were correlated with meteorological variables making possible to identify three patterns of deposition. The main pattern, dominated by leaf-exchanging species, consisted of a cycle with the highest litterfall at the beginning of the rainy season, preceding by basically three months the peaks of the annual cycles of rainfall and temperatures. Other two patterns, dominated by brevi-deciduous species, peaked at the end of the rainy season and at the end of the non-rainy season. Tropical and subtropical dry forests that present the highest leaf fall gradually earlier than rain forests (as the studied sites) are possibly related to the start of senescence process. It seems that such process is triggered earlier by a more severe hydric stress, besides other factors linked to a minor physiological activity of plants that result in abscission.Key words -litterfall, meteorological variables, phenology, primary productivity, sucession RESUMO -(Padrões de produção de serapilheira em uma Floresta Ombrófi la Densa aluvial secundária no Sul do Brasil). A produção de serapilheira é uma das variáveis mais acessíveis para se estimar a produtividade primária, fl uxos de nutrientes e transferências de carbono em ecossistemas terrestres. Padrões fenológicos e condições climáticas ainda não estão bem explicados para fl orestas tropicais e subtropicais sob climas com sazonalidade pouco pronunciada, muito menos a interação desses padrões com a dinâmica sucessional. A produção mensal de serapilheira foi estimada durante dois anos em uma Floresta Ombrófi la Densa aluvial durante o nono e décimo ano de regeneração. O sítio com vegetação mais desenvolvida apresentou maior produção de serapilheira (6,4 ton ha -1 ano -1 ), quando comparado com o sítio com vegetação menos desenvolvida (3,0 ton ha -1 ano -1 ). As produções mensais de 11 frações de serapilheira foram correlacionadas com variáveis meteorológicas possibilitando identifi car três padrões de deposição. O padrão principal, dominado por espécies sempre ver...

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Section: Meteorological Variablessupporting

confidence: 60%

Section: Meteorological Variablesmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil

Scheer¹,

Gatti²,

Wisniewski³

et al. 2009

Rev. bras. Bot.

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“…Hábito (Arv: arbóreo; Arb: arbustivo; Her: herbáceo; Epi: epifítico; Tre: trepador). foi representada por valores reduzidos na chuva e banco de sementes, provavelmente em decorrência da limitação de sementes e da dispersão, 0,4 e 0,3, respectivamente, que pode estar relacionada com o seu curto período de frutificação (Marques & Oliveira 2004). Psidium cattleianum (4ª espécie em VI na área adjacente) não foi amostrado na chuva de sementes deste estudo, corroborando com Silva et al (2009) que consideraram a espécie com limitação de sementes e dispersão.…”

Section: Resultsunclassified

Dinâmica da regeneração natural em uma floresta baixa de restinga degradada

Oliveira

Cruz

Rossi

et al. 2015

Hoehnea

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-(Dynamics of the natural regeneration in a degraded low sandbank forest). This study aimed to characterize the composition of the seed rain and the seed bank in a degraded low sandbank forest to verify the inflow and establishment of the seed diaspores in the area under evaluation, its natural regeneration and contribution of the nearby remnants. At Ilha Comprida, in a degraded site, ten samples were taken monthly (1 m² each) for the seed rain and quarterly (0.25 m² each) for the seed bank, during the period of a year. In a the nearby remnant, arboreous individual with DBH ≥ 3 cm were sampled in the phytosociology study. During the specified period, 1627 diaspores were sampled in the seed rain and 2986 diaspores in the seed bank, and 356 individuals were sampled in the phytosociology study. The presence of Clusia criuva, Gaylussacia brasiliensis, Myrcia ilheoensis, Tapirira guianensis, and Tibouchina clavata in the seed rain and seed bank, considered nucleation species, with high biotic potential or little limitation of dispersion, can allow successional development in the area. The density and quality of species arriving and settling in the area have the potential to help it regenerate naturally. Keywords: dynamic ecosystems, seed bank, seed rain RESUMO -(Dinâmica da regeneração natural em uma floresta baixa de restinga degradada). Este estudo teve como objetivo caracterizar a composição da chuva e banco de sementes em uma floresta baixa de restinga degradada, a fim de verificar o aporte e estabelecimento dos diásporos na área e a contribuição dos remanescentes próximos para a regeneração natural. Num trecho degradado em Ilha Comprida, dez coletas mensais (1 m² cada) para a chuva de sementes e trimestrais (0,25 m² cada) para o banco de sementes foram realizadas durante um ano; e num remanescente vizinho amostraram-se indivíduos arbóreos com DAP ≥ 3 cm no estudo fitossociológico. Amostraram-se 1.627 diásporos na chuva de sementes, 2.986 no banco e 356 indivíduos no estudo fitossociológico. A presença de Clusia criuva, Gaylussacia brasiliensis, Myrcia ilheoensis, Tapirira guianensis e Tibouchina clavata na chuva e banco de sementes, consideradas espécies nucleadoras, de elevado potencial biótico ou pouca limitação de dispersão, podem possibilitar a sucessão na área. A densidade e qualidade de espécies que chegam por meio da chuva de sementes e que se estabelecem no banco de sementes indicam que a área pode se recuperar via regeneração natural. Palavras-chave: dinâmica de ecossistemas banco de sementes, chuva de sementes

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Seasonality study of essential oil from leaves of Cymbopogon densiflorus and nanoemulsion development with antioxidant activity

Seibert

Rodrigues

Carneiro

et al. 2018

Flavour & Fragrance J

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The development of formulations that maintain the biological and physical chemistry properties of essential oils is an important choice when they are used as an active ingredient. This study aimed to characterize the essential oil from leaves of Cymbopogon densiflorus and evaluate the antioxidant activity of the oil, and to produce a nanoemulsion formulation containing it. The essential oil was obtained by hydrodistillation, and seasonality was analysed every 2 months by gas chromatography–mass spectrometry, showing that more than 90% of the composition was maintained for the whole period and that the major compounds were trans‐p‐menta‐2,8‐dien‐1‐ol, cis‐p‐menta‐2,8‐dien‐1‐ol, trans‐p‐menta‐1(7),8‐dien‐2‐ol, cis‐piperitol, and cis‐p‐menta‐1(7),8‐dien‐2‐ol. Stable nanoemulsions were prepared by phase inversion method encapsulating the essential oil. The antioxidant activity was evaluated by 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) free radical scavenging and 2,2′‐azino‐bis(3‐ethylbenzothiazoline‐6‐sulphonic acid (ABTS) methods. In the first test, free and nanoemulsified essential oil showed half‐maximal inhibitory concentration (IC50) values equivalent to 14.689 and 3.692 mg mL−1, respectively. In the second test, these values were 0.567 and 0.43 mg mL−1. The development of nanoemulsion‐based essential oil from leaves of C. densiflorus was viable, and the formulated oil was able to reproduce the antioxidant activity at a concentration four times lower than that of the pure essential oil.

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Fenologia de espécies do dossel e do sub-bosque de duas Florestas de Restinga na Ilha do Mel, sul do Brasil

Cited by 64 publications

References 22 publications

Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil

Patterns of litter production in a secondary alluvial Atlantic Rain Forest in southern Brazil

Dinâmica da regeneração natural em uma floresta baixa de restinga degradada

Seasonality study of essential oil from leaves of Cymbopogon densiflorus and nanoemulsion development with antioxidant activity

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