Vulnerability of aggregates separated from selected anthrosols developed on reclaimed dumpsites
2000
Valla, M. | Kozak, J. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic)) | Ondracek, V.
The state of soil structure in epipedons of anthrosols formed on dumpsites reclaimed by Doly Bilina Company was studied. The methodology proposed by Le Bissonnais, Le Souder (1995) was used. The vulnerability coefficient (Kv) was introduced to evaluate the structural stability. It expresses a rate of diminishing of the aggregate size compared to an ideal weighted average of the size in the initial sample. A lower aggregate vulnerability was found in the case of older anthrosols (approximately 30 years), a higher vulnerability in the case of younger ones. Kv value was directly proportional to the silt and clay content and pH H2O. Reciprocally proportional relationship was found with Corg content and A400/A600 ratio as an indicator of organic matter quality. The use of quadratic form of regression equations gave the best results. It was statistically proved that the mechanism based on the breakdown by the air entrapped in the aggregates was responsible for the aggregate destruction in the case of fast wetting. Amendments of composted paper-mill wastes to the mineral dumpsite earth lead to a decrease of vulnerability by the above-mentioned mechanism and by swelling and shrinkage. An influence of organic matter to the mechanical desaggregation was low.
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