INVESTIGADORES
SALVIA Maria Mercedes
congresos y reuniones científicas
Título:
Multiscale-multisensor approach in studying wetlands of the Paraná River Delta Region in Argentina.
Autor/es:
KANDUS, PATRICIA; KARSZENBAUM HAYDEE; SALVIA, MARÍA MERCEDES; GONZALEZ TRILLA, GABRIELA; PRATOLONGO, PAULA; GRINGS, FRANCISCO MATIAS; ZOFFOLI, LAURA; FERRAZZOLI, PAOLO
Lugar:
Roma, Italia
Reunión:
Simposio; Globwetland Symposium; 2006
Resumen:
The
Paraná River Delta Region is a huge mosaic of wetlands which covers 17,000 km2
at the final portion of the Del Plata Basin in Argentina. This paper
focuses on a brief review about how different sensors and a multi-scale
approach bring insight on structural and functional features of wetlands, from
regional to a specific ecosystem level in a top-down/bottonup approach. At broad scale, ENVISAT Wide Swath Mode (WSM)
imagery along with optical SACC-MMRS and the last two decades of Normalized
Vegetation Index (NDVI) time series of NOAA-AVHRR satellite systems were used
to analyze landscape heterogeneity and wetland functioning in the whole region.
The influence of "El Niño" flooding events was evaluated in different
wetland landscape units. At fine scale, on the Lower Delta, detailed maps were
produced using six Landsat Thematic Mapper images obtaining 28 wetland cover
classes with an accuracy assessment of approximately 83%. In this region,
special attention has also been given to the study of freshwater tidal marshes
dominated by Scirpus giganteus. This marsh covers more than 40%
of the Lower Delta surface, in the upper portion of the Del Plata Estuary. Net
aboveground primary production (NAPP) field measurements were calibrated with
NDVI derived from Landsat ETM+ surface reflectance values resulting in the
first map of NAPP for the delta marshes. We also addressed
the subject of ENVISAT ASAR imagery detecting aboveground biomass variations
and water below the canopy.