IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Age effects on the climatic signal in Araucaria araucana from xeric sites in Patagonia, Argentina
Autor/es:
MARTÍN ARIEL HADAD; FIDEL A. ROIG; JOSE A. BONINSEGNA; DANIEL PATON
Revista:
PLANT ECOLOGY & DIVERSITY
Editorial:
TAYLOR & FRANCIS LTD
Referencias:
Lugar: Londres; Año: 2014
ISSN:
1755-0874
Resumen:
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Background: At
different cambial ages, trees experience changes in their structure and
interactions with environmental conditions. Reciprocal mechanisms between tree
age and physical resources, photosynthetic rates, and xylem production may influence
hydraulic resistance and plant water stress. However, it is yet uncertain how
these mechanisms are associated with changes in growth sensitivity to
biophysical drivers, especially climate.
Aim: To establish
age-associated climate?growth relationships in growth rings of
Araucaria araucana trees from the temperate xeric zones of northern Patagonia,
Argentina.
Methods: We analysed
the growth in 211 A. araucana trees from four sampling sites, in three age
classes: Young (≤120 years), mature (121?275 years), and old (≥276
years). We explored the correlations between the signal strength of tree growth
and climate, based on comparisons between each age-class chronology and monthly
mean surface air temperature, total precipitation, and the Southern Annular
Mode (SAM) index.
Results: The young
trees showed higher correlations when their growth was compared with
precipitation, air temperature, and the SAM index during austral spring and
summer months of the same year. In contrast, growth in mature and old tres showed
higher correlations with summer temperatures of the previous growing season.
Conclusions: The
sensitivity of the radial-growth response of A. araucana to climate varies with
age and is strongest in the rings of young trees.