BARBOSA, R. I.

CASTILHO, C. V. de

NASCIMENTO, M. T.

VILLELA, D. M.

English

Repository Open Access to Scientific Information from Embrapa

ATBC 2012 49th Annual Meeting Bonito-MS, Brasil     FS04.P.13   The mesoscale distribution patterns of six abundant tree species on Maracá Island, Brazilian Amazonia: are monodominance of Peltogyne characterised by unusual soils?  Nascimento MT1, Barbosa RI2, Castilho CV3, Villela DM1 - 1UENF - Laboratório de Ciências Ambientais, 2INPA - Núcleo Roraima, 3EMBRAPA - Centro de Pesquisa Agroflorestal de Roraima  The tropics are widely renowned for their spectacular plant diversity. The occurrence of one or a few species dominating large areas of tropical forest was until the mid-1980's considered uncommon. An interesting case study is that of Peltogyne gracilipes Ducke that forms the only monodominant forest that has been described in the Amazon Basin. Previous studies had suggested that Peltogyne forest is related to lower slopes, poor drainage and high soil Mg concentrations. All these studies are based on small scale analyses, with no evidence that this pattern occurs at a mesoscale. To assess whether the monodominance of Peltogyne is related to environmental factors we examine the response of the P. gracilipes, and other five abundant tree species (Astrocaryum aculeatum, Attalea maripa, Ecclinusa guianensis, Licania kunthiana and Pradosia surinamensis) on Maracá Island in relation to soil attributes using the standard RAPELD grid system for intensive studies of 25 km2 square of the Program for Biodiversity Research (PPBio). In the grid there are thirty regularly-spaced plots of 1 ha without a fixed shape, but having a 250 m center line that follows the topographic isoclines. Plot of 20 m x 250 m of the left side of the center line was used for sampling trees ≥ 30 cm DBH (0.5 ha) and plot of 10 m x 250 m (0.25 ha) was used for sampling trees ≥ 10 cm DBH. A CCA (canonical correpondence analysis) was used to analyse the relationship between species abundance and soil variables. Altitude (r= 0.80) and understory height (r= 0.55) were the variables significantly positively correlated with axis I of ordination, while Mg (r= -0.67) and Fe (r= -0.65) were negatively correlated. The soil variables showed a weaker relation with axis II. Canopy height (r= 0.34) and pH (r= 0.30) were the variables that showed the highest correlation coefficients with this axis. Results indicate that there is a sharp relationship between soil traits and the monodominance of Peltogyne. 77

The mesoscale distribution patterns of six abundant tree species on Maracá Island, Brazilian Amazonia: are monodominance of Peltogyne characterised by unusual soils?

http://www.alice.cnptia.embrapa.br/bitstream/doc/1065072/1/FS04P13.pdf

The mesoscale distribution patterns of six abundant tree species on Maracá Island, Brazilian Amazonia: are monodominance of Peltogyne characterised by unusual soils?

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