Vegetação e solos de Muçununga em Caravelas, Bahia

• Ano de defesa: 2009
• Autor(a) principal: Saporetti Junior, Amilcar Walter
• Orientador(a): Meira Neto, João Augusto Alves
• Banca de defesa: Schoereder, José Henrique , Araujo, Dorothy Sue Dunn de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Botânica
• Departamento: Botânica estrutural; Ecologia e Sistemática
• País: BR
• Palavras-chave em Português: Filogeografia; Ecossistema arenícola; Mata Atlântica
• Palavras-chave em Inglês: Phytogeography; Ecosystem arenicola; Mata Atlântica
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::BOTANICA
• Link de acesso: http://locus.ufv.br/handle/123456789/360

The Muçununga is a vegetation type surrounded by Atlantic rain forest of Southern Bahia and Northen Espírito Santo, Brazil. Its physionomic formas range from graminoid fields to dense woodlands. This study was carried out at Caravelas country (41°13 17 and 39°28 24 ). The Muçununga vegetation is still unknown by Brazilian environmental legislation. Therefore, it has been vulnerable since it has not been recognized as a related ecosystem to Atlantic rain forest. The working hypotesis of this study have been: 1) Muçununga is a related ecosystem to Atlantic rain Forest; 2) the phytophisionomic range of Muçununga is due to soil variation; 3) plant functional types could be identified according to the stress they are adapted; 4) the plant diversity is lower on sites of higher stressing soils. There were chosen six vegetation forms of Muçununga for allocation of 20 x 20m plots for vegetation and soil studies. There were sampled all life forms of plants, and were sampled soils by means of superficial collection profiles. Analysis of plant populations related to soil properties were made by means of Canonical Correspondence Analysis (CCA) and regression. There were sampled 169 species and 132 genera from 64 botanic families. The richest families were Myrtaceae, Melastomataceae and Asteraceae. Panicum trinii and Lagenocarpus rigidus were the most important (VI) species. The Muçununga was more similar to Restingas of Rio de Janeiro and Espírito Santo states, and less similar to those vegetation unvelated to Atlantic rain forest. The soils of Muçununga were classified as spodosoil, acidic, sandy and with wide range variation of water table depths, fine sand to grass sand ratio, and organic matter. The more stressing is the soil type, the simpler is physiognomic form and the lower are richness and diversity. Furthermore, plant functional types were identified, correlated to the stress of Muçununga s soils. Hence, the Muçununga vegetation is na ecosystem related to the Brazilian Atlantic rain Forest under extreme stressing conditions of soil that are cause of to a unique vegetation under the Atlantic domain.