Spectrophotometric Characteristics of Peat Having Various Origins and Degrees of Decomposition

Author: Kovalev A.A.   Nichiporovich Z.A.  

Publisher: Springer Publishing Company

ISSN: 0021-9037

Source: Journal of Applied Spectroscopy, Vol.70, Iss.3, 2003-05, pp. : 365-371

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Abstract

The reflectivity of peat of different origins (13 species) in the visible spectral range (0.40–0.78 μm) is investigated. The laws governing light reflection by peat are established. With increase in the degree of decomposition from 5 to 30%, a decrease in the coefficient of diffuse reflection is observed over the entire visible spectrum without a change in the character of spectral curves. A correlation analysis has demonstrated the presence of close feedback between the degree of decomposition R and the reflectivity of peat, which is rather accurately described by an exponential equation. The correlation coefficients in the range investigated were varied from -0.38 to -0.63 for valley peat and from -0.79 to -0.89 for a high-moor one. The integrated index of four types of waves (660, 700, 740, and 750 nm) is suggested for the red region of the spectrum as the most informative one in comparison with RV based on nine wavelengths and widely applied in soil science. An informative wavelength of 750 nm for estimating the reflectivity of peat as a function of the decomposition degree has been established.

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