Transformation of humus condition of chernozems in agroecosystems of forest-steppe of the central black earth economic region

Objective. To reveal the main subtype features of agrogenic transformation of humus state of chernozems in the conditions of agroecosystems of forest-steppe zone of the Central Chernozem region. Methods. The objects of research are leached chernozems and typical virgin-arable lands. The study of chernozems of natural ecosystems and agroecosystems was carried out in the territories of reserves, fallow areas and different land-uses in the Voronezh and Kursk regions. All soil analyses were carried out according to standardized and generally accepted methods in soil practice. Results. The features of the structure of the humus profile of typical and leached subtypes of chernozems in a range “virgin land-arable land”. The features of agrogenic transformation of fractional-group composition of humus of chernozems as a result of their use in agroecosystems of forest-steppe of the Central Chernozem region are revealed. Summary. Humus profiles of forest-steppe subtypes of chernozems are characterized by different type of humus distribution. When plowing at one meter depth black soil lost 269 (leached) and 274 (typical) t/ha of humus. The transformation of the humus composition of black soils of agroecosystems is on the way for the redistribution of groups and factions in the composition of humus. There is a tendency to the growth of complex ha, formed by younger mobile forms of humus substances. Humus composition of Chernozem typical in comparison with the leached subtypes is changed from a low level of intensity. Overall, changes in the composition of humus in arable Chernozem during long-ploughing does not go beyond the zonal type of soil, but only define some peculiarities of the composition of humus in some capacity increase in the composition of humus fractions HA2, HA3, FA2 and FA3 and reducing fractions HA1, FA1а and FA1.

chernozems of forest-steppe, virgin land, arable land, humus state, transformation