IANIGLA   20881
INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Schinopsis brasiliensis Engler (Anacardiacea), an assessment of its potential for tropical dendroclimatological applications in the Cerrado and Chaco forests, Bolivia
Autor/es:
LIDIO LOPEZ; RICARDO VILLALBA
Lugar:
Mendoza
Reunión:
Congreso; AmeriDendro 2016; 2016
Institución organizadora:
Laboratorio de DendrocronologĂ­a, IANIGLA- CONICET
Resumen:
Given the scarcity of instrumental data and the lack of proxy-climatic information in the tropics, it is extremely valuable to explore the dendrochronological potential of the numerous tree species growing in tropical forests. We assessed for the first time the dendrochronological characteristics of Schinopsis brasiliensis, an arboreal species from the dry-tropical Cerrado and Chaco forests in Bolivia. Similar to the majority of woody species in the Cerrado and Chaco forests, growth rings of Schinopsis brasiliensis are determined by the presence of thin but continuous lines of marginal parenchyma. Based on 22 samples from 15 trees, we present the first ring-width chronology for this species covering the period 1838-2013 (175 years). Standard dendrochronological statistics indicated a significant common signal in radial growth of Schinopsis brasiliensis. The comparison between variations in regional climate and ring widths indicate that tree growth is directly related to rainfall and inversely to temperature. Following the winter dry season, rainfalls in late spring and early summer increase soil water supply activating tree growth. In contrast, above-average temperatures during the same period increase evapotranspiration, intensify the water deficit, and reduce radial growth. The strong dependence of Schinopsis brasiliensis growth on water supply provide evidence of its high dendrochronological potential to reconstruct past precipitation variations in the tropical dry forests from the Cerrado and Chaco in Bolivia
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