Índice de Área Foliar em Floresta de Transição Amazonia Cerrado em Diferentes Métodos de Estimativa

Luciana Sanches, Nara Luísa Reis de Andrade, José de Souza Nogueira, Marcelo Sacardi Biudes, George Louis Vourlitis

Abstract


The Leaf Area Index (LAI) is a vegetation biophysical variableused for various primary production models across scales and global modelsof climate, hydrology, biogeochemistry and ecology. This paper comparesthree estimates of LAI by at transitional forest Amazon Cerrado. LAI isestimated on field measurements where were utilized light canopytransmittance through the Beer-Lambert equation, remotely sensedModerate Resolution Imaging Spectroradiometer (MODIS) monthly LAIproduct and hemispherical photographs. LAI based on field observationsfor Beer-Lambert equation presented seasonality, obtaining an annual meanvalue of 3.21 to 3.74 m2 m-2 in 2001 to 2003. LAI through MODIS sensorLAI product presented value of 5.25 a 5.54 m2 m-2 in 2001 to 2003. LAIbased on hemispherical photographs presented value of 3.05±0.52 to4.12±0.56 m2 m-2 in Jun/2004 to May/2005 (Silva, 2006). The MODISproduct did not presented significant correlation with others methods. TheMODIS LAI product for transitional forest and tropical forest tropicalcould be important for studies of canopy dynamics and need to be validatedto be used reliable in coupling biosphere atmosphere models.



DOI: https://doi.org/10.5902/2179460X9750

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