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vol. 5, nr. 3 (2005)
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The method for the determination of the quality of washed down soil material on the basis of measurements of delluvial fan sediments
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Marek Podlasiński
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Department of Soil Erosion and Soil Reclamation, University of Agriculture, ul. Papieża Pawła VI 3, 71-442 Szczecin |
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vol. 5 (2005), nr. 3,
pp. 711-721
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abstract:
In lowland relief, deluvial sediments are stored incomplete because the lighter particles are transported directly to rivers, lakes or pitbogs. In areas of eroded fields only coarser fractions – sands – remain. This paper presents a method of assessing all sediments that were wash down on the basis of deluvial fans formed of coarse-grain fractions, primarily sands. Because in most investigated cases it is impossible to measure all soil material deposited in lower part of slopes, an indirect method of determining all sediments washed down was applied. The basis of the method consist in the fact that from an eroded area water washes down totally a certain layer of soil. When the texture and C content in humus horizon of adjacent eroded soils are known, one can determine the texture of sediments accumulated in deluvial fan. Results of comparison of fan texture with texture of eroded soils showed to be convergent in 95%. In sandy fans the average deposition of eroded soil material ranges from 60 to 70%. While the finest deposits (silt, clay) percentage share is 30-40% of total mass, they contain 65-76% of humus and nutrients.
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keywords:
water erosion, deluvial fans, wash down material
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original in:
Polish
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