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Title: Tree communities of the gallery forests of the IBGE Ecological Reserve, Federal District, Brazil
Author: Silva Junior, Manoel Claudio da
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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This study was designed to discover whether there are patterns in tree communities and to examine their possible links with environment in undisturbed gallery forests. The study focused on the Pitoco, Monjolo and Taquara streams, within the Ecological Reserve of the 'Instituto Brasileiro de Geografia e Estatístca' in the Federal District, in Central Brazil. The three gallery forests are representative of an endangered and extremely important vegetation formation, which is closely related to the maintenance of environmental health and to the volume and quality of the water supply in the region. The conspicuous flora, including species which reflect characteristic environmental features, guided the choice of sites. An intensive study focused on the vegetation and soils of each gallery. Tree species were recorded using the Point Centred-Quarter (PCQ) method from the stream margins to the forest-cerrado border. Soil samples were taken to reflect environmental changes within each catchment. Analysis of the galleries' phytosociology and diameter distribution highlighted their considerable heterogeneity. Only Copaifera langsdorffii and Tapirira guianensis occurred as important species in all three sites. This probably reflects environmental differences between the three areas. Classification by TWINSPAN distinguished forest communities at each locality, referred to as 'wet' and 'dry' according to their position in relation to the stream margins and site topography. The floristic links between the galleries and communities were investigated by cluster analysis (UPGMA), which reinforced the model of a strong association between communities and soil moisture. In fact there was a stronger relationship between communities from areas of similar soil moisture at different stream locations, than between 'wet' and 'dry' communities within the same stream. The soil properties were also found to follow a consistent spatial patterning at all three sites.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available