INFLUÊNCIA DE MÉTODOS DE COLETA DE DADOS ESPECTRORRADIOMÉTRICOS SOB ÍNDICES DE VEGETAÇÃO EM EUCALIPTO

Sr Thomas Schroder, Anna Paula Lora Zimmermann, Sr Rudiney Soares Pereira, Srta Cristina Redin, Sr Leonardo Mortari Machado, Srta Marciane Danniela Fleck, Srta Najila Souza da Rocha

Abstract


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.


Keywords


Remote sensing; Reflectance; Spectral pattern.

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DOI: http://dx.doi.org/10.5902/2236117017745



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