A model approach to the biochemical analysis of coniferous forests from AVIRIS data
- Univ. of Southhampton (United Kingdom)
- British National Space Centre, Cambridgeshire (United Kingdom)
The biochemical concentration of vegetation leaves and canopies is an important determinant of the net primary productivity of forests. The chlorophylls and carotenoids function as antenna pigments to capture the visible light needed for photosynthesis and carbon assimilation whilst cellulose and lignin are important structurally and control leaf litter decomposition and the rate of nutrient cycling. Recent research has demonstrated strong correlations between the concentration of these biochemicals and specific absorption peaks in laboratory and Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) spectra. However, our limited understanding of canopy radiative processes prevents the optimum selection of wavebands for the regression equations. A leaf model named LIBERTY (Leaf Incorporating Biochemistry Exhibiting Reflectance and Transmittance Yields) was used to develop this understanding and optimise our ability to link foliar spectra and biochemical concentration. This model was characterized for coniferous needles with specific absorption coefficients of pure pigments, water, cellulose and lignin and output was compared with both dry and fresh leaf spectra (laboratory). Initial studies suggest that LIBERTY inversion, combined with forest canopy structural parameters, such as Leaf Area Index (LAI) and Specific Leaf Area (SLA) can assist in the estimation of biochemical concentrations from atmospherically corrected vegetation spectra (AVIRIS). 20 refs., 3 figs.
- OSTI ID:
- 379504
- Report Number(s):
- CONF-960613--; CNN: Grant GR3/7647
- Country of Publication:
- United States
- Language:
- English
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