Ecologia da madeira e aspectos ecofisiológicos foliares de quatro espécies de florestas tropicais secas no estado de Sergipe

• Ano de defesa: 2017
• Autor(a) principal: Aragão, José Roberto Vieira
• Orientador(a): Lisi, Claudio Sergio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Sergipe
• Programa de Pós-Graduação: Pós-Graduação em Ecologia e Conservação
• País: Brasil
• Palavras-chave em Português: Ecologia; Madeira (anatomia); Florestas tropicais; Fisiologia; Climatologia; Anéis de crescimento; Anatomia ecológica; Ecofisiologia foliar; Florestas secas; Mudanças ambientais
• Palavras-chave em Inglês: Tree-rings; Ecological anatomy; Foliar ecophysiology; Dry forests; Environmental changes
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::ECOLOGIA
• Link de acesso: https://ri.ufs.br/handle/riufs/4479

Global climate change has severe consequences at various trophic levels, especially tree plant species. In regions of Tropical Dry Forests (TDF) these impacts are extreme and still little studied. This work evaluated how environmental conditions (local, regional and global), imminent climate changes, influenced the dendroecology, wood anatomy and foliar ecophysiology of four tree species occurring in the TDF of two sites, Sergipe, Grota do Angico Natural Monument, and in a remnant of TDF in Fazenda São Pedro, municipality of Porto da Folha, Sergipe. Samples of wood and leaves of six individuals of each species, Aspidosperma pyrifolium, Ziziphus joazeiro, Tabebuia aurea and Libidibia ferrea were randomly collected. For each individual, three wood samples were collected, two for dendroecology and one for the anatomy of the wood. Leaves, of the same plants were collected at both sites, in the dry and rainy periods, and intended for the ecophysiological analyzes. Collection data on species distribution (SpeciesLink project) were used in the construction of ecological niche models (ENM). Historical climate datas were obtained from INMET, AGRITEMPO, state data, the WolrdClim project, and the NOAA. The results of the dendroecological analyzes showed the formation of annual growth rings in the four species, that the chronologies of all the taxa have a significant relation with rainfall events in both sites, and some taxa had the chronologies related to the surface temperature of the Atlantic Ocean (TSA) and ENSO events, indicating a decrease in plant growth accompanied by lower rainfall volumes in the last decade. The ENM showed different responses of the species niche to the environmental variables (precipitation and temperature) in the TDF, with significant correlations with the anatomical and physiological data, and showed the occurrence of distinct functional groups among the taxa, changing as a function of the changes in the climate. The present study confirmed that the four TDF species have dendroecological potential for climate response, and that ENM's in line with functional (anatomical and physiological) traits analysis may be a viable solution to evaluate the responses of these taxa To xeric environments, in addition to serving as diagnoses of future global climate change, given its high correlation with the functional modifications of the species evaluated here.