Predição de biomassa arbustiva lenhosa empregando dados de inventário e o índice de diferença normalizada extraído em imagens landsat 5 tm
Abstract
Com o intuito de estudar se o Índice de Vegetação de Diferença Normalizada
(NDVI), gerado a partir de imagens de satélite de média resolução, pode ser utilizado na
quantificação de biomassa vegetal aérea de plantas arbustivas lenhosas, regeneradas após
a ocorrência de incêndios florestais, foram instaladas 18 parcelas de amostragem (10m2)
em locais ardidos entre os anos de 2000 e 2005 na região de Viseu. A metodologia
utilizada baseou-se no ajustamento de modelos de regressão entre a quantidade de
biomassa (t.ha-1) pesada em campo pelo método destrutivo, em cada parcela, e os valores
da resposta espectral referentes ao NDVI, calculados e extraídos de imagens Landsat
Thematic Mapper (TM). Os resultados obtidos mostram que a quantidade de biomassa
vegetal apresenta uma correlação positiva com os valores de NDVI. A estimativa de
biomassa lenhosa aérea forneceu resultados significativos, tendo permitido ajustar uma
equação que descreve a quantidade de biomassa (t.ha-1) em função do comportamento
espectral da vegetação.
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