IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
artículos
Título:
Potential of Schinopsis lorentzii for dendrochronological studies in subtropical dry Chaco forest of South America
Autor/es:
FERRERO, M.E.; VILLALBA, R.
Revista:
TREES-STRUCTURE AND FUNCTION
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2009 vol. 23 p. 1275 - 1284
ISSN:
0931-1890
Resumen:
The lack of knowledge about species with welldelimited
annual rings has hampered the development of
dendrochronological records in the subtropical Chaco
region of South America. In this contribution, we present
the first tree-ring chronology of Schinopsis lorentziiSchinopsis lorentzii
(Anacardiaceae), a dominant species in the semi-arid
Chaco. Cross sections were collected near Las Lajitas,
Salta, Argentina, and processed following the methods
commonly used in dendrochronology. Annual growth
variations between radii from a single individual and
between radii from different trees were highly correlated.
To determine the climatic parameters that control radial
growth, we compared annual tree-ring variations against
regional temperature and precipitation records. Correlation
functions indicate that tree growth is highly influenced by
springsummer rainfall variations, which represent more
than 80% of the total annual precipitation. The chronology,
which covers the interval from 1829 to 2004, provides a
context for the unprecedented increase in precipitation
since the mid-1970s in the region. The climatic-sensitivity
of S. lorentzii provides a unique opportunity to reconstruct
precipitation variations during past centuries in the extensive
semiarid regions of subtropical South America.
precipitation variations during past centuries in the extensive
semiarid regions of subtropical South America.
S. lorentzii provides a unique opportunity to reconstruct
precipitation variations during past centuries in the extensive
semiarid regions of subtropical South America.