Spectral characteristics of several arable soils in Hunan Province and their relationship with soil organic matter were studied through field sampling and lab analysis. Results showed that the spectral reflection curves of the tested soils changed in shape to a certain extent, with the spectrum reflectance increasing significantly either over all wavebands or at individual wavebands after the soils were cleared soil organic matter. Furthermore, the correlation coefficients of the spectrum reflectance at the studied wave bands with the content of total iron, fr...
