D.V. Dubovik, E.V. Dubovik
All-Russia Research Institute of Arable Farming and Soil Erosion Control, Karl Marx str., 70b, Kursk, 305021, Russia
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Summary. We studied the changes of content of total and mobile compounds of heavy metals: manganese, zinc, copper, cobalt, nickel and lead by the method of atom-absorption spectroscopy. The investigations were carried out on slope lands with different degree of erosion (Kursk region, Medvenka district). The soil was typical black soil. On the moderately eroded slope of southern exposure in 1 m layer of soil the decrease in the total content of following compounds occur in comparison with non-eroded dividing plateau: manganese – on the average by 8.0 mg/kg; zinc – by 2.1 mg/kg, copper – by 1.1 mg/kg. On the slightly eroded northern slope this reduction is 15.0 mg/kg, 0.4 mg/kg and 1.7 mg/kg, respectively. On the northern and southern slopes in 1 m soil layer the content of the total nickel was higher on the average by 3.8 and 2.7 mg/kg, the lead content – by 0.3 and 1.7 mg/kg, respectively, than that on the dividing plateau. It is caused by the loss of the upper soil horizon on eroded slopes and the involvement of lower soil layers, saturated with these elements, into tillage process. The content of total cobalt on the moderately eroded southern slope exceeds its amount in soil of the watershed and the northern slope due to more alkaline reaction of the soil solution caused by the raising of the carbonate layer. The content of mobile compounds of manganese, zinc, copper, cobalt, nickel and lead in the upper soil layer on the moderately eroded slope of southern exposure drops in comparison with the non-eroded watershed soils. It is caused by ablation of the part of humus horizon and the decrease in humus amount, which fixes the mobile form of heavy metals. The same tendency is also observed on the slightly eroded northern slope regarding manganese, zinc, cobalt and lead. High amounts of mobile copper and nickel on the northern slope as compared with the other relief elements are caused by more acid pH facilitating the dissolving of these elements.
Keywords: erosion degree, heavy metals, slope exposure, typical black soil, total forms, mobile compounds.
Author Details: D.V. Dubovik Dr. Sc. (Agr.), Нead of Group, (е-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); E.V. Dubovik, Cand. Sc. (Agr.), Senior Researcher.
For citation: Dubovik D.V., Dubovik E.V. Influence of erosion degree on the content of heavy metals in black soils. Dostizheniya nauki i tekhniki APK. 2015. V. 29. No 8. pp. 24-27 (In Russ).