Composicao floristica e estrutura fitossociologica da vegetacao arborea do Parque Estadual de Vacununga, Santa Rita do Passa Quatro (SP). II Gleba Capetinga Oeste
This paper continues the phytosociological studies in the"Parque Estadual de Vacununga", Santa Rita do Passa Quatro county, State of Sao Paulo, Southeastern of Brasil, and presents the survey of the West Capetinga stand (WCS). The mesophytic semideciduous forest studied is located at the coordinates 21°41'00''-21'' S and 47{eth}34'37''-39'39" W, on altitudes which range from little more than 620 m and little less than 560 m. The climate is Koeppen's Cwag', showing anormal 24 mm hidric deficit during April to September. Two types of soil occurred: "Latossolo Vermelho-Escuro", and "Latossolo Roxo", both distrophic and belonging to the Oxisol group. Twenty two 20 m x 40 m systematic plots were laid out, including trees with a minimum diameter (DBH) at breast height of 10 cm. A total of 1, 812 trees were sampled, belonging to 81 species, 69 genera, and 37 families, accounting for astanding cilindrical volume of 194.05 m3/ha, and a total density of 1,029.5 trees/ha. The Shannon-Weaver diversity index was 3.14 nats/species for the hierarchical diversity, and 3.667 nats/tree for the alpha diversity, figures which agree with the studies carried out in other mesophytic forests of the Sao Paulo State. Leguminosae was the richest family in species (23.4 percent of all species sampled), and was also the most numerous (20.8 percent) of all trees sampled. This is in agreement with surveys of other mesophytic forest in the State of Sao Paulo, which show a family dominance o Leguminosae. The most important species were Alchornea iricurana (Euphorbiaceae), Cariniana legalis (Lecythidaceae), Metrodorea nigra (Rutaceae), Astronium graveolens (Anacardiaceae). The distribution of abundance among the sampled populations followed the model stablished for the most of the broad-leaf Brasilian forests. The arboreal floristic composition of the WCS, when compared with other forests, strikes a great species variation in mesophytic forests. An unbalanced diameter distribution would indicate perturbation occurred in a recent past, and would confirm pre-climax regenerative phase for the WCS.
| Main Authors: | , , , , |
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| Format: | biblioteca |
| Published: |
1989
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| Subjects: | COMPOSICION BOTANICA, ESTRUCTURA DEL BOSQUE, DEFORESTACION, DISTRIBUCION DE LA POBLACION, DENSIDAD DE LA POBLACION, BRASIL, |
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