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Physikalische Eigenschaften von Schluffdecken
Author(s) -
Ehlers W.
Publication year - 1977
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19771400110
Subject(s) - silt , hydraulic conductivity , loess , porosity , soil water , infiltration (hvac) , geology , soil science , mineralogy , organic matter , geomorphology , geotechnical engineering , materials science , chemistry , composite material , organic chemistry
Physical properties of silt crusts The physical properties of silt crusts of two locations within the eastern part of the Solling mountains in Western Germany were investigated. They were formed downhill on top of sloping grey brown podzolic soils derived from loess during heavy rainfall, which caused aggregate breakdown and erosion. The crusts were several cm in thickness. They consist of 80% coarse silt (20–60μ), of 12% medium silt (6–20μ) and of 5% clay (<2μ). The content of organic matter is low. Porosity of the silt crusts is 47–51 vol.%. Compressed silt crusts with 40% porosity contain only 2,5 vol.% of large pores > 15μ, According to this the unsaturated hydraulic conductivity remains almost constant when tensions are increasing, but it drops immediately, when the 15μ pores drain at 200cm H 2 O pressure. The saturated conductivity varies with porosity in the range of 10–50 cm/day. But in the A p ‐horizon of a grey brown podzolic soil with higher contents in clay and organic C the saturated conductivity varies with porosity in the range of 10–10 000 cm/day. Only during rainstorms with high intensity silt crusts will impede rapid water infiltration into the underlying grey brown podzolic soil.