Dendrochronological analysis of isotopic and tree species of the Peruaçu Valley (MG) and interpretation of rainfall

Abstract

Dendrochronology is the study of a time series of growth of tree-rings. Annual rings are defined when they are formed within the period of one year and are sensitive to middle. Climate, ecological relationships and functional characteristics stand out as the main information that can be retrieved from the studies of tree-rings. However, any variable that can influence the growth ring formation, your composition and climate change, can be accessed through the analysis of the same, by means of cross-dating of stable isotopes or anatomical variation of the vessels. Most of the studies on climate change from temperate regions in the last 2000 years comes from dendroclimátics studies. One of the measures adopted in growth rings, the stable isotopes are among the most successful parameters related to climate change. There is also another viable alternative to extract more information about the availability of water in history, We can use the anatomy of the vessels of the wood through the measurement of the diameter and area. Thus, the objective of the present work is to maximize the sign of precipitation in records of growth rings of five species of dry forest.From intra-annual measures of anatomical variables and stable isotopes of oxygen and carbon, in addition to the fully dendrochronological approach. (AU)