Correlação de fitomassa foliar de campo cerrado com dados espectrais obtidos pelo sistema MSS/Landsat e por radiometria de campo / X

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

The objective of this study is to correlate foliar biomass data obtained in the field by a conventional destructive method with its spectral response from MSS-LANDSAT and from field radiometry. Both systems work in similar spectral bands throughout the red and near infrared wavelenghts. Its great potential for agriculture indicates the need for timely and accurate estimate of biomass of the "Cerrado" of the Central Brazil, specially the "Campo Cerrado", which presents a significant herbaceous stratum. Field data were collected in two periods: June 1983 and May 1984, corresponding to the middle of the dry season and the end of the-wet season, respectively. Three MSS-LANDSAT images with dates close to the field work were used and its digital counts were transformed into vegetation indices. Results showed that: a) foliar biomass ranged from 297,9 to 808,0 g/m2; b) clipped foliar biomass presented significant linear correlation coefficient with the tested vegetation indices; c) tested vegetation indices (Ratios and TVIs) correlated better with water content than with total fresh biomass; d) a high linear correlation coefficient between the TVIs obtained with MSS-LANDSAT and field radiometry was observed.

ASSUNTO(S)

vegetacao vegetation radiometria radiometry fitomassa satelites landsat multiespectral scanning systems vegetative index phytomass indice de vegetacao sistemas multiespectrais de varredura

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