Growth and leaf demography of two Cecropia species

Santos, Flávio Antonio Maës dos

doi:10.1590/s0100-84042000000200003

Cited by 19 publications

(18 citation statements)

References 28 publications

(27 reference statements)

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“…Cecropia species from Amazonian and from southeastern Brazil in open or disturbed habitats were all close to the geometric similarity model (Sposito & Santos 2001). For other pioneer species, the values did not fit any of the predicted mechanical stability models (Alvarez-Buylla & Martinez-Ramos 1992;Santos 2000), as it was also found for Euterpe edulis, an endemic palm of Brazilian Atlantic Forest (Alves et al 2004). For all mentioned species, strong allometric relations between stem height and diameter were found, making Syagrus glaucescens an exception to the provided models along with Metroxylon sagu (Kjaer et al 2004).…”

Section: Allometric Relations and Models Of Mechanic Stability In Syamentioning

confidence: 82%

Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil

Miola

Fernandes

2015

Acta Bot. Bras.

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Syagrus glaucescens is an endemic palm found in the rupestrian grasslands of the Espinhaço Mountains in southeastern Brazil. It is highly associated with quartzitic soils and exhibits strong intra-specific morphological variation in the different areas where it occurs. Allometric traits were used to verify whether there are any significant differences in the morphological traits between populations of this species located in two distinct areas. In the region of the Serra do Cipó individuals exhibit decumbent stems whereas on the Diamantina Plateau stems are straight and perpendicular to the ground. Soil quality was related to plant morphological traits to test the hypothesis that allometric variation is influenced by soil nutritional differences. Stem shape and size differed significantly among individuals inhabiting the two different regions: individuals in Serra do Cipó were shorter and had fewer leaves compared to individuals found in the Diamantina Plateau. Water retention capacity and nutrient absorption of the soils of the two sites were markedly different. In Serra do Cipó the soils were more acid, with higher aluminum saturation and lower sand content compared to the soils in Diamantina. These traits correlated with stem shape and indicate that soil acidity and aluminum saturation influence the architecture of S. glaucescens.

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Section: Allometric Relations and Models Of Mechanic Stability In Syamentioning

confidence: 82%

Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil

Miola

Fernandes

2015

Acta Bot. Bras.

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“…e Vochysia tucanorum Mart., indicando a presença de clareiras antigas. A primeira espécie, assim como outras do gênero Cecropia; têm sido considerada característica de áreas que sofreram perturbação e onde a luminosidade é mais intensa (Oliveira-Filho et al 1994a, Santos 2000. Vochysia tucanorum também é exigente de luz, ocorrendo especialmente nas bordas mais iluminadas da floresta estudada (Schiavini 1997, van den Berg e Oliveira-Filho 1999).…”

Section: Resultsunclassified

Aspectos da variação ambiental em uma floresta de galeria em Itutinga, MG, Brasil.

Berg

Santos²

2003

Ciênc. Florest.

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Foi caracterizada a heterogeneidade ambiental em uma área de floresta de galeria (7,55 ha), em Itutinga, MG, Brasil, pelas variações das propriedades químicas e físicas do solo, da topografia e da abertura de dossel. As propriedades do solo e a topografia foram estudadas em 28 parcelas de 10 x 30 m utilizadas em um levantamento da comunidade arbóreo-arbustiva da área. Para a abertura do dossel utilizaram-se duas transecções de 50 m de largura, compostas por parcelas contíguas de 10 x 10 m, cruzando a floresta de lado a lado, perpendicularmente ao curso d'água. Fotos hemisféricas foram tomadas sobre estacas alternadas das extremidades das parcelas. Os dados de solo e topografia foram analisados por meio de uma PCA (Análise dos Componentes Principais) e a abertura do dossel mediante gráficos de tendência e regressão linear. A variação mais importante em termos de solos e abertura do dossel se deu no sentido do distanciamento da borda da floresta e aproximação do curso d'água. Nesse sentido, a abertura do dossel diminuiu (b = -0,096; R2 = 0,34) e a umidade e acidez do solo aumentaram (Eixo 1 do PCA, autovalor = 9,713). Os maiores valores da abertura do dossel próximo à borda foram explicados pela entrada de luz lateral através da borda da floresta com o campo limpo circundante.

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“…Tropical species often show significant regressions between height and diameter (Alvarez-Buylla andMartinez-Ramos 1992, Santos 2000). This trend seems to be genetically determined (Santos 2000) and related to an equal resource distribution for growth in width and height (Niklas 1994). It was expected that, as an understorey species, R. parquioides had a tendency of allocating more biomass for diameter growth than for height, since it needs to have morphologies that increase light interception and persistence (King 1990).…”

Section: Discussionmentioning

confidence: 99%

Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil

Cardoso

Salvalaggio

Marques

2010

An. Acad. Bras. Ciênc.

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The expectations that shade-tolerant forest species show 1) a population structure composed by a high amount of small individuals, and 2) biomass allocation for diameter higher than for height growth, were tested for Rudgea parquioides, a typical shrub in Southern Brazil. We described the size structure (height and stem diameter) and allometrical relations of a R. parquioides population by counting and measuring all the individuals in a 725m 2 area in the municipality of Curitiba (25 • 25 S; 49 • 19 W). A total of 916 individuals (12,634 ind.ha −1 ) were recorded in the area. The first expectation was supported, since distribution by height and diameter classes showed a predominance of small individuals (skewness coefficients > 1). On the other hand, the regression between height and stem base diameter showed slope β < 1, which indicates that growth in height is higher than in diameter, not supporting the second expectation. These results show that life strategies in shade-tolerant species may imply in more trade-off combinations than previously described.

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Growth and leaf demography of two Cecropia species

Cited by 19 publications

References 28 publications

Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil

Growing straight versus growing decumbent: soil quality and allometry in Syagrus glaucescens Becc. (Arecaceae), an endemic and threatened palm of the Espinhaço Mountains, Brazil

Aspectos da variação ambiental em uma floresta de galeria em Itutinga, MG, Brasil.

Population structure of Rudgea parquioides (Rubiaceae), a shade-tolerant shrub species, in Southern Brazil

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