Hysterese der Wasserspannungskurve in organogenen Böden |
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| Authors: | P Ilnicki |
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| Institution: | Biuro Projektów Wodnych Melioracji, Poznań, Polen, die Arbeit wurde im Niedersächsischen Landesamt für Bodenforschung-Bodentechnologischem Institut Bremen durchgeführt |
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| Abstract: | Soil water hysteresis in organic soils In 20 undisturbed samples of peat, muck, peaty soil and humic sand, the hysteresis of the moisture characteristic by soil suction from 0 to –9,8 kPa and from 0 to –29,4 kPa was measured. The greatest hysteresis was found in peat. Suction values from –1 to –3 kPa caused differences of 0,076 cm3/cm3 in water content during drying and wetting. In muck with low ash content and in humic sand the hysteresis was smaller. In peaty soil and muck with high ash content (> 40 %) it diminished to twice or three times lower values in comparison with those in peat. In organic soils the hysteresis decreases clearly by soil suction higher than –6 kPa. Repetition of drying and wetting gave a diminution (ca. 30 %) of the hysteresis loop in peat and displaces it towards the field of lower water content. The hysteresis of muck did not change considerably. The change of the porosity structure (pore ? > 30 μm) during the repetition of drying and wetting indicate that some soil shrinkage has occured. |
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