A influência da elevação do nível médio relativo do mar na estrutura etária de florestas de mangue em Guaratiba - RJ

• Autor(a) principal: Souza, Brunna Tomaino de
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13901
• topic: Dendrochornology; Rhizophora mangle; Succession; Climate; Dendrocronologia; Rhizophora mangle; Sucessão; Clima; CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA

Mangrove forests have distribution in intertidal regions along the tropical and subtropical coast, with morphological attributes that allow them to deal with the frequency of flooding and regular flooding of the roots, in addition to variations in salinity of the sediment. In Guaratiba, different studies show that the forest undergoes the process of moving toward hypersaline plain in response to regional trends of higher average relative level of the sea. The objective of this study is to determine the age structure in two physiographic types of mangrove Guaratiba- RJ, from the sampling populations of the species Rhizophora mangle, considering the age and structural parameters of each individual. It is intended, therefore, to identify different successional stages, in order to understand the effects of increased NMRM and climate in the long term in the region. For sampling, were chosen two zones adjacent to the river mangrove Piracão corresponding to the physiographic types basin forests and transition through the demarcation of representative samples. Measurements were made of the structural parameters of all individuals of the three species in the local, mangle, Avicennia schaueriana and Laguncularia racemosa. For dendrochronological analysis, samples were taken at the time of the base and the dap of individuals of R. mangle, species chosen for signaling the successional process. The climatic characterization was obtained by compilation of precipitation data, temperature sequential water balance and climate indices, and subsequently compared to variation patterns of growth rings. The results showed that the physiographic types have, in fact, different stages of development, in which the mean age match basin, which is at a more advanced successional stage. The growth rate in the transition was reduced, with more growth layers in classes of similar diameter as young individuals of the basin. The chronology of R. mangle responded to changes in precipitation and water balance, signaling periods more rain entry by average or large-scale phenomena such as El Niño. I conclude that this species is indicative of succession processes that occur in Guaratiba mangrove forests and can be used in the reconstruction of local climatic signals