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The objective of this work was to evaluate the correlation between spectral variables and aboveground carbon stock of agroforestry systems in the region of Tomé&#8209;Açu, PA, Brazil. Twenty&#8209;four vegetation indices from three groups (simple ratio, normalized difference, and complex), calculated from images of the TM/Landsat&#8209;5 sensor acquired in 2008, were tested. The obtained variables were correlated, by means of simple linear regression, to carbon stock from four agroforestry systems with different ages and floristic composition. The correlations obtained among spectral variables and carbon stock were significant in 47% of the tested indices and changed according to the differences in biomass of the analyzed systems. The best correlations were obtained by the simple ratio and normalized difference indices in young agroforestry systems, and by complex vegetation indices in older agroforestry systems.O objetivo deste trabalho foi avaliar a correlação entre variáveis espectrais e o estoque de carbono da biomassa aérea de sistemas agroflorestais da região de Tomé&#8209;Açu, PA. Foram testados 24 índices de vegetação de três grupos (razão simples, diferença normalizada e complexos), gerados a partir de imagens do sensor TM/Landsat&#8209;5, adquiridas em 2008. As variáveis obtidas foram correlacionadas, por meio de regressão linear simples, ao estoque de carbono de quatro classes de sistemas agroflorestais, de diferentes idades e composições florísticas. As correlações obtidas entre as variáveis espectrais e o estoque de carbono foram significativas em 47% dos índices testados e variaram de acordo com as diferenças de biomassa nos sistemas analisados. As melhores correlações foram obtidas pelos índices de vegetação de razão simples e de diferença normalizada, em sistemas agroflorestais jovens, e pelos índices de vegetação complexos, em sistemas agroflorestais mais antigos

Correlação de variáveis espectrais e estoque de carbono da biomassa aérea de sistemas agroflorestais