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Contemporary Trend in Erosion of Arable Southern Chernozems (Haplic Chernozems Pachic) in the West of Orenburg Oblast (Russia)

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dc.date.accessioned 2019-01-22T20:41:26Z
dc.date.available 2019-01-22T20:41:26Z
dc.date.issued 2018
dc.identifier.issn 1064-2293
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/148298
dc.description.abstract © 2018, Pleiades Publishing, Ltd. The contemporary trend in the degradation of arable southern chernozems (Haplic Chernozems Pachic) in the steppe zone of south-eastern European Russia under the impact of water erosion has been evaluated based on a field study of changes in the deposition rate of eroded products on the bottoms of the currently stable negative landforms within a small catchment (1.92 km2 in area) with almost completely tilled slopes in the west of Orenburg oblast, in the basin of the Samara River (a left tributary of the Volga River). The dating of deposited sediments and the analysis of their temporal dynamics have been performed using the radioactive isotope 137Cs as a chronomarker. The results of a thorough analysis of catchment topography, grain size distribution data on soils and sediments, hydrometeorological observations, and satellite data have been used. It is found that the mean accumulation rate of chernozem erosion products on the bottom of a small catchment valley was 1.9–2.0 cm/year (16.5–28.4 kg/m2 annually) during the period of 1959–1986 (4.2–4.8 cm/year, or 30.4–83.5 kg/m2 annually in 1959–1963) compared to only 0.52–0.68 cm/year, or 6.6–11.9 kg/m2 annually, during the period of 1986–2016; i.e., the thickness of deposited sediments decreased at least by 3.0–3.6 times, and their mass decreased by 2.0–4.3 times (2.9 times on the average). It is shown that the main reason for the presumed significant decrease in the erosion rate of southern chernozems in the region during the last decades was the reduction in surface water runoff from slopes during the spring snowmelt period, as well as the probable change in the structure of crop rotation toward some increase in the share of perennial grasses, and erosion control measures.
dc.relation.ispartofseries Eurasian Soil Science
dc.subject caesium-137
dc.subject catchment
dc.subject climate change
dc.subject dry valley
dc.subject erosion
dc.subject Russian Plain
dc.subject sediment
dc.subject sedimentation
dc.subject southern chernozem (Haplic Chernozem Pachic)
dc.subject steppe
dc.subject stratozem (Fluvisol)
dc.subject surface water runoff
dc.title Contemporary Trend in Erosion of Arable Southern Chernozems (Haplic Chernozems Pachic) in the West of Orenburg Oblast (Russia)
dc.type Article
dc.relation.ispartofseries-issue 5
dc.relation.ispartofseries-volume 51
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 561
dc.source.id SCOPUS10642293-2018-51-5-SID85047422336


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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