employee from 01.01.2026 until now
employee from 01.01.2022 until now
employee from 01.01.2021 to 01.01.2026
Tyumen, Tyumen, Russian Federation
VAK Russia 4.1.1
VAK Russia 4.1.2
VAK Russia 4.1.3
VAK Russia 4.1.4
VAK Russia 4.1.5
VAK Russia 4.2.1
VAK Russia 4.2.2
VAK Russia 4.2.3
VAK Russia 4.2.4
VAK Russia 4.2.5
VAK Russia 4.3.3
VAK Russia 4.3.5
UDC 631.41
The aim of the study was to identify the influence of succession and fallow age on the exchangeable acidity of grey forest soil in the subtaiga zone of the Trans-Urals. The study was conducted in the Nizhnetavdinsky district of the Tyumen region, 2 km from the village of Beryozovka. The distance between sampling points did not exceed 1.5 km. Virgin grey forest soil in its natural state is characterized by an intrasoil profile differentiation of exchangeable acidity. In the humus horizon A1, the exchangeable acidity is 5.3 units. In horizons A1A2 and B1, the pH of the salt extract changes to 4.6 and 5.0 units, respectively. Long-term use of grey forest soil as arable land led to a change in exchangeable acidity down to horizon B2 (50–80 cm). The pHKCl varies from 4.6 in the plow horizon to 4.5 units in the illuvial horizon B1; deeper, no significant influence of the agrogenic factor is recorded. The emergence of herbaceous vegetation on post-agrogenic soil during the first 15 years restores the exchangeable acidity to the level of the virgin site only in the upper humus layer A1 (0–20 cm). No changes are noted in the underlying horizons compared to the arable land. After 30 years, perennial grasses contribute to a change in exchangeable acidity in the humus horizon A1 (0–20 cm) to a level close to neutral. In the underlying horizons A1A2 and B1, the pHKCl value also tends to approach the level of the virgin site. Coniferous trees during the first 15 years do not have a negative impact on exchangeable acidity. However, after 30 years, they lead to a change in the species diversity of the herbaceous vegetation and assume a dominant position. This resulted in the neutralization of the restoration of exchangeable acidity in the upper part of the soil profile achieved during the 15-year period.
herbalist deposit, gray forest soil, metabolic acidity, succession, agrogenic factor, coniferous deposit
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