IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Tree-ring chronology network from Centrolobium microchaete in the Bolivian Cerrado region, Santa Cruz, Bolivia
Autor/es:
LIDIO LOPEZ AND RICARDO VILLALBA
Lugar:
Uspallata
Reunión:
Encuentro; CRN 2047 Science meeting in Mendoza; 2013
Institución organizadora:
IANIGLA/IAI
Resumen:
The Cerrado, one of thelargest biogeographical regions in South
America (> 24 million ha),
extends from central Brazil to eastern Bolivia and northeastern Paraguay. In Bolivia,
the Cerrado region covers an area > 16.5 million ha and includes both wet and dry
tropical ecosystems. In order to reconstruct
past regional climatic variations, cross-sections of Centrolobium microchaete were collected in sites with current logging practices
located in both wet and dry forests. Eight sites chronologies
have been developed by measuringring widths from previously dated
cross-sections. The number of
trees per site chronologiesvaries from 22 in Zapocó to more than 50 in Santa Monica. Tree-ring chronologies from humid
sites are shorter in length (Makanaté, 100 years) than
those originated from treesin dry forests (Purubí, 254 years). The statistics indicate
that the chronologies are of good
quality with a high percentage ofcommon signals between trees. The growth ofC. microchaete is strongly influenced by weather conditionsduring summer. Summer
rainfalls favor radial growth, whereas high summer temperatures, which reduce the water availablefor growth, are inversely correlatedto tree growth. This newly developed chronologies network will be used to develop the first dendroclimatic reconstructionsin the Bolivian Cerrado
region.