Purtova L.N., Timofeeva YA.О.
Pochvovedenie 2021; (12): 1481-1491
The differences of physical, chemical, optical properties and biological activity parameters have been established on the basis of a comprehensive study of two soils types, which are widely used in agricultural system of region, with an active occurrence of nodules formation process. The level of catalase enrichment was low in the studied soils. Soils with higher content of SOC were characterized by low values of the integral reflection parameters. Differences in the optical parameters of the studied soils and nodules in the CIE-L*a*b* system have been identified. The increase of relationship between optical parameters, as well as decrease of L* value and increase of b* value were determined in nodules in comparison with soil mass. Nodules from two types of soils were characterized by the high catalytic activity level. The close negative correlation between the values of catalytic activity and integral reflection was established. Based on the current results, the potential role of nodules in the carbon accumulation in soils has been shown. The activation of catalase and catalytic activity and formation the numerous zones of carbon accumulation within the nodules were the specific features of nodules from Eutric Gleysoils (Aric). The carbon-rich zones were active centers of elements with variable valence oxidation that promoted to the formation of larger nodules in these soils.
