INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Tree-ring chronology network from Centrolobium microchaete in the Bolivian Cerrado region, Santa Cruz, Bolivia
LIDIO LOPEZ AND RICARDO VILLALBA
Encuentro; CRN 2047 Science meeting in Mendoza; 2013
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.