Purtova L.N., Timofeeva Y.O.
В журнале Eurasian Soil Science
Год: 2021 Том: 54 Номер: 12 Страницы: 1855-1863
A detailed study of Albic Stagnosols and Eutric Gleysols that are widely used in agriculture of the Far East and are characterized by the active formation of iron–manganese nodules has shown differences in their physicochemical and optical properties and biological activity parameters. The level of catalase activity in the studied soils is relatively low. Soils with a higher content of Ctot are characterized by low integral reflectivity. Differences in the optical parameters of the studied soils and nodules have been identified in the CIE-L*a*b* system. In comparison with the soil mass, the nodules display a closer relationship between optical parameters, a lower L* value, and a higher b* value. In both soils, the nodules are characterized by the high catalytic activity. A close negative correlation is observed between the values of catalytic activity and integral reflectivity. The results of our study attest to the significant role of nodules in the carbon accumulation in soils. An enhanced catalase and catalytic activity and formation the numerous zones of carbon accumulation within the nodules are specific features of nodules from Eutric Gleysols (Aric). The carbon-rich zones are active centers of oxidation of elements with variable valence, which contributes to the formation of larger nodules in these soils.
