Spectral absorption features as indicators of water status in coast live oak (Quercus agrifolia) leaves
A total of 139 reflectance spectra (between 350 and 2500 nm) from coast live oak (Quercus agrifolia) leaves were measured in the laboratory with a spectrometer FieldSpec®Pro FR. Correlation analysis was conducted between absorption features, three-band ratio indices derived from the spectra and corresponding relative water content (RWC, %) of oak leaves. The experimental results indicate that there exist linear relationships between the RWC of oak leaves and absorption feature parameters: wavelength position (WAVE), absorption feature depth (DEP), width (WID) and the multiplication of DEP and WID (AREA) at the 975 nm, 1200 nm and 1750 nm positions and two three-band ratio indices: RATIO975 and RATIO1200, derived at 975 nm and 1200 nm. AREA has a higher and more stable correlation with RWC compared to other features. It is worthy of noting that the two three-band ratio indices, RATIO975 and RATIO1200, may have potential application in assessing water status in vegetation.
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Document Type: Research Article
Affiliations: Centre for Assessment & Monitoring of Forest & Environmental Resources (CAMFER), 145 Mulford Hall, University of California, Berkeley, CA 94720-3114, USA
Publication date: 2003-05-01