Atualização de Documento

XVI SBSR

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Resumo	(*)(?)	The chlorophyll (Chl) content of a crop canopy is a biophysical variable that quantitatively expresses the photosynthetic capacity of a vegetation stand and it is related to many important plant functions and parameters. Therefore, it is not surprising that many remote sensing studies have focused on the estimation of Chl content of vegetation canopies to asses the vitality of plants and to detect vegetation stress. However, there is little information regarding how the distribution of Chl within vegetation canopies defines the reflectance signatures measured remotely and the derived spectral indexes. The goal of this study was to determine how deep into a maize canopy, a spectral vegetation index, based on the red edge and NIR spectral bands, senses the Chl content of individual leaves. Reflectance was measured using a hand-held radiometer at both the leaf and canopy level in order to retrieve foliar and total canopy Chl content, respectively. A hierarchical regression analysis was used to find (i) how many maize leaves contribute significantly to total canopy Chl content, and (ii) how many leaves, from top to bottom, are sensed by a field radiometer and by the red edge chlorophyll index, CIred edge . Results showed that CIred edge senses the chlorophyll content of the top 7 to 8 leaves in the maize canopy and, thus, is able to accurately estimate total chlorophyll content in canopy.
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e-Mail (login)		tereza@sid.inpe.br