Soil loss on the arable lands of the forest-steppe and steppe zones of European Russia and Siberia during the period of intensive agricultureстатья
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Аннотация:An assessment of the total soil loss from cultivated land was undertaken for the Chernozems–Kastanozems belt ofEuropean Russia and Siberia, based on the results of the National Soil Survey for administrative regions and thedetailed study of three sentinel catchments, located in different parts of the Russian Plain. The soil profiletruncation method was used to assemble data on soil erosion for the period of intensive agriculture, whichranged in duration between 110 and 230 years for the different parts of the sentinel study catchments and whichhad mean durations of 50–220 years for the total area of arable land comprising the administrative regions ofRussia. The average value of the mean annual erosion rate for all regions of European Russia was estimated at0.5 mm yr−1 for Chernozems and 0.4 mm yr−1 for Kastanozems, equivalent to ~6 t ha−1 yr−1 and~4.8 t ha−1 yr−1, respectively. The total volume of soil eroded on arable lands during the period of ploughing,in the Chernozems–Kastanozems soil belt of Russia, amounted to 33.4 × 109 m3 (excluding sediment re-deposition on the arable land). The topography of arable slopes and the erosion index of precipitation are thecritical factors determining the differences in the rates of soil loss, both at the level of small catchments and atregional level, while the duration of the ploughing period does not significantly affect the proportion of erodedland. The contribution of wind erosion to soil loss of the study regions located in the dry steppe zone is identified.It was established that the values of soil erosion rates obtained using the soil profile truncation method are ingood agreement with the evaluation of soil erosion rates compiled during long-term monitoring of soil loss usingrunoff plots. Our rates of soil loss do not agree with recent estimates based on the revised universal soil lossequation (RUSLE) for some administrative regions of European Russia with significant wind erosion.