congresos y reuniones científicas
What is the response of Austrocedrus Chilensis to the climatic variability in a rainfall gradient along the Andean Patagonia?
MARCOTTI, E.; AMOROSO, M. M. ; RADINS, M.; SRUR, A. ; BONADA, A.; BIANCHI, L.; VILLALBA, R.; BONINSEGNA, J. A.
Congreso; Third American Dendrochronology Conference; 2016
Ianigla, Tree-Ring Society
The populations of Austrocedrus chilensis (ciprés de la cordillera) in the Andean Patagonia develop along a steep altitudinal (500-1050 m.a.s.l.) and rainfall gradient (600-2000 mm per year), which cause changes in the populations of the species. In order to study the climate-growth relationship of these populations along the gradient, tree-ring width chronologies were developed from twelve sites located along two transects: North Transect (40°S- 71°O) and South Transect (41°S-71°W). The analysis of the growth-climate response of the twelve chronologies (of about 260 years), generally presented negative correlations with temperature and positive correlations with precipitation. The elevated temperatures during December (growth season) significantly correlated with a decrease in the growth of the species, a relationship that was observed for all of the sites. It was also observed that in mesic sites the high temperatures during February and March (end of austral summer), may also negatively affect growth. On the other hand, precipitation exhibited a positive correlation with growth, particularly during the months of November, December and January, resulting these the most important months for the growth of ciprés. The sites found farthest east, which have the least precipitation, exhibited a weak correlation with temperature and precipitation, while the sites farthest west had a strong correlatienon with precipitation. This could be associated to a greater response and sensibility in the growth of cipres, when water is a limiting resource. These studies on environmental gradients are important, since they allow us to understand the influence that climatic variables have on the species of Patagonia, which is of vital importance since these forests will be greatly affected by expected future climate scenarios.