Abstract
—According to published and archival data, the dynamics of soil plowing in Tula oblast in general and in its particular districts has been traced. It has been found that the active agricultural development in the southern part of the modern Tula oblast began no earlier than in the middle of the 17th century. According to the maps of different years, changes in the area of arable land in the Lokna River basin (Plavsk district of Tula oblast) from the end of the 18th century until the present time have been determined. The reliability of our data on the history of plowing of the territory is confirmed by the literature data. The composition of field crops and changes in farming systems during the period under review have been reconstructed, and a significant conservatism of these indicators has been revealed: the fallow three-field system dominated throughout the 19th century and the first half of the 20th century; the predominance of rye among winter crops and oats among spring crops remained until the 1970s. According to the WaTEM/SEDEM and using historical data on changes in the main factors of soil erosion as input parameters, the intensity and volumes of rainfall runoff for the selected stages of development of the Lokna River basin have been calculated. In order to compare the results with the literature data for the period of 1980–1993, the rates and volumes of snowmelt washout have been estimated. An assessment of the reliability of the reconstructed model parameters for remote historical epochs has been carried out. The analysis of historical changes in the factors and rates of erosion indicates that the maximum extent of plowed area and the maximum intensity of erosional processes in Lokna River took place in the last quarter of the 19th–early 20th centuries. The influence of particular geomorphic positions of arable land on the rates and volumes of soil erosion has been revealed.
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