The effect of the humus content and composition, the humification intensity, and the pH on the paramagnetic activity of organic matter in soils of vertical zones of the Ubsu-Nur Depression was revealed. It was found that the electron paramagnetic resonance (EPR) spectra of these soils have a relatively broad absorption band with the g factor equal to 2.0031 ± 0.0002; the EPR spectral curve has the form of the first derivative of the Gaussian absorption curve. The method of calculating the EPR spectral intensity was specified; regression equations were calculated for the pairs: the total carbon and the spectral intensity, the (HA + FA) carbon and the spectral intensity, and the C_(ha)/C_(fa) ratio and the spectral intensity, which showed a correlation between the group composition of the humus and the EPR spectral intensity. The results obtained permitted us to separate the soils of the Ubsu-Nur Depression into three groups with high, medium, and low effects of the humus status parameters on the EPR spectrum intensity.
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