Contents of Organic Carbon and Nitrogen in Particle-Size Fractions of Aggregates of Typical Chernozems (Protocalcic Chernozems)
2021
Kholodov, V. A. | Yaroslavtseva, N. V. | Yashin, M. A. | Farkhodov, Yu. R. | Ilyin, B. S. | Lazarev, V. I.
Specific features in the content and accumulation of organic carbon and nitrogen in the aggregates of typical chernozems (Protocalcic Chernozems) of long-term experimental plots with different land management systems are assessed. The size fractions in the aggregates of >10, 10–3, 2–1, 1–0.25, and <0.25 mm are examined. The carbon and nitrogen contents are shown to depend on the land management system in a statistically significant manner. The dependence of carbon content on the size of aggregates is observed in five land use systems of the seven examined ones (permanent tilled fallow, unmanaged fallow after permanent tilled fallow, permanent corn and potato fields, shelterbelt, and annually mown steppe). As for nitrogen content, such pattern is observed in three land use variants. The specific features in carbon and nitrogen contents in the size fractions of soil aggregates depend on the type of land use. The carbon content under herbaceous vegetation (steppe) increases with a decrease in the size of aggregates reaching its maximum in the fraction of 1–0.25 mm. As for tree stands (shelterbelt), the maximum carbon content is observed in the fractions of >10 and <0.25 mm. All aggregates <2 mm of the chernozem under herbaceous vegetation in the process of restoration contain considerably higher amount of carbon as compared with the coarser fractions. The nitrogen content in the size fractions of the soil of steppe and shelterbelt plots follows the patterns similar to those of the carbon content.
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