IIBYT   23944
INSTITUTO DE INVESTIGACIONES BIOLOGICAS Y TECNOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Indicadores dendrogeomorfológicos para a avaliação espacial e temporal de processos erosivos
Autor/es:
CHARTIER M. P.; BOVI R. C.; ROIG F. A.; DOMINGUEZ CASTILLO V.; COOPER M.
Lugar:
Foz do Iguaçu-Paraná
Reunión:
Congreso; XX Reunião Brasileira de Manejo e Conservação do Solo e da Água; 2016
Institución organizadora:
Sociedade Brasileira de Ciência do Solo
Resumen:
Water erosion is an important degradation process, which results in loss of soil, reduction in agricultural productivity, and causes severe environmental impact. Dendrogeomorphology is a method in which structure of the wood of the trunk and roots of tree and shrub species affected by sediment deposition or by root exposure is analysed, to establish the chronology of erosive events. The objective of the present work was to apply the methodology of dendrogeomorphology based on scars analysis to the roots of tropical trees, Schizolobium parahyba, exposed to the process of water erosion. The study area presents features arising from erosion, such as gullies, with the consequent exposure of tree roots. The growth rings and the scars formed by the flow of water and soil particles were analysed in transverse sections of exposed roots mainly to date the erosion processes and after to infer the mean rate of erosion. This paper demonstrates the potential of Schizolobium parahyba for dendrogeomorphological studies, validating the dendrogeomorphology as a research tool in tropical climate. Scars used for erosion dating in cross sections have been proven as good indicators of geomorphic processes. The erosion average rate varied from 2.93 to 3.89 cm year-1, considered as moderate to high for wooded areas. The relevance of this work is to become the first attempt in tropical regions to date and estimate the rate of erosion using dendrogeomorphological techniques on exposed roots.