Dendrocronologia e composição isotópica de anéis de crescimento de Araucaria angustifolia do Sul do estado do Paraná nos últimos quatro séculos

Abstract

Earth clime have been changing ever since and life in the planet has evolved to adapt to its constant change. However, in the last 150 years, clime changes have accelerate in a way never experienced by lifeforms. The speed temperatures and hydric dynamics have been changing around the globe has stimulated researchers of the most diverse fields of knowledge to try to elucidate its causes and effects. In this context of global changes, dendrochronology studies have stood out in the elucidation of clime changes for allowing annual resolution paleoclimatic studies around the globe. This study used modern ring measure techniques and stable isotope analysis in Araucaria angustifolia tree species from south Brazil to identify regional climatic patterns and its influence on A. angustifolia. The obtained results showed alternated periods of increased and limited growth of the studied trees and strong relation with Intertropical Convergence Zone and South Atlantic Convergence Zone patterns, in addition to a conspicuous increase in A. angustifolia’s growth rate in the recent period.