Influência de métodos de coleta de dados espectrorradiométricos sob índices de vegetação em eucalipto
DOI:
https://doi.org/10.5902/2236117017745Palabras clave:
Sensoriamento remoto, Reflectância, Padrão espectralResumen
Objetivou-se verificar a influência de métodos de coleta de folhas em índices de vegetação: posição de coleta na copa, orientação cardeal e estação do ano em Eucalyptus grandis. Os dados foram coletados em dois povoamentos distintos em duas árvores dominantes cada. Foram coletadas 15 folhas em cada posição e em cada orientação, acrescidas de uma amostra de mesmo tamanho no centro. A coleta foi realizada em um único dia, das 13:00 as 15:00 horas. O material foi analisado com o espectrorradiômetro FieldSpec®3 e a resposta espectral de cada orientação e posição foi dada pela média da leitura espectral das folhas. Foram analisados 60 diferentes índices de vegetação de acordo com a literatura. Para avaliar o efeito da estação sobre os índices foram realizadas coletas nas quatro estações do ano, configurando 4 tratamentos. Foram utilizados modelos mistos para analisar a influência nos fatores (posição e estação) e sua interação. Os dados foram considerados aninhados em cada orientação, dentro de cada árvore e de cada área. A análise estatística foi realizada no software R com o pacote nlme. Dos índices de vegetação analisados, seis apresentaram dependência da posição/orientação e estação de coleta, sendo necessário em posteriores estudos a obediência de suas dependências.
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