AN ASSESSMENT OF SEDIMENT REDISTRIBUTION ON THE SLOPES OF SMALL CATCHMENT IN THE LOESS ZONE OF TADJIKISTAN BY USING RADIOCESIUN DATING
https://doi.org/10.15356/0435-4281-2014-1-53-65
Abstract
Present paper results detailed investigation of sediment redistribution rates on different land-use units at the small catchment Bodomo, located in the loess belt of Tajikistan to the east from Dushanbe. Radiocesium dating is used for determination soil loss/gain along 7 slopes with different aspect, located at the typical for given area land-used parcels (tillage, pasture, orchards). Initial inventory of 137Cs fallout at the reference site is varied taking in account decay in range 3945-4210 kBk/m2. It is confirmed that initial inventory of 137Cs fallout is relatively uniform and it is possible to apply 137Cs technique for evaluation of sediment redistribution rates. It was established, that maximum annual soil losses for period 1989-2006 is observed for the arable lands, and they change depending from slope angles in range 50-90 t/ha per year. Mean annual erosion rates on pasture for period 1963-2006 are varied in range 4-11 t/ha per year depending from cover of soil and vegetation. However, sediment produced by sheet and rill erosion contributes not more than 10-15% from total volume of sediment originated from the catchment area. Gully erosion and scree processes, developed on the sides of erosion forms of the different order, are the main contributors into catchment denudation.
About the Authors
H. N. Safarov
Lomonosov Moscow State University
Russian Federation
Geographical Department
Russian Federation
Geographical Department
M. V. Markelov
Lomonosov Moscow State University
Russian Federation
Geographical Department
Russian Federation
Geographical Department
V. N. Golosov
Lomonosov Moscow State University
Russian Federation
Geographical Department
Russian Federation
Geographical Department
B. Wolfgramm
Centre for Development and Environment (CDE), Bern
Switzerland
Switzerland
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For citations:
Safarov H.N., Markelov M.V., Golosov V.N., Wolfgramm B. AN ASSESSMENT OF SEDIMENT REDISTRIBUTION ON THE SLOPES OF SMALL CATCHMENT IN THE LOESS ZONE OF TADJIKISTAN BY USING RADIOCESIUN DATING. Geomorfologiya. 2014;(1):53-65. (In Russ.) https://doi.org/10.15356/0435-4281-2014-1-53-65
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