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ŽABENSKÁ ANETA, DUMBROVSKÝ MIROSLAV. 2015. Changes of Soil Aggregate Stability as a Result of the Eff ect of Freeze-thaw Cycles. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(4): 1211–1218. The objective of the present research was to assess the changes in soil erodibility during the nonvegetation period as one of the factors aff ecting the snowmelt erosion. The temperature fl uctuation was simulated with the use of a climatic chamber ex situ. The soil surface was for simplicity reasons considered without any plant or snow cover. The paper deals with the rate of soil erodibility determination – the soil erodibility should increase due to the decrease of soil aggregate stability depending on the number of freeze-thaw cycles and initial soil moisture. Soil samples (taken from three sites) were subjected to freeze-thaw cycles under laboratory conditions. Changes in soil agreggate stability were monitored as one of the main soil characteristics which determine the soil erodibility. Two methods were used to determine the soil macroaggregate stability (soil aggregate fraction 1–2 mm): standard single-sieve method of wet sieving (Kemper and Rosenau, 1986), and dry aggregate analysis using a set of fl at sieves with a diameter of 1 mm and 0.5 mm. The results of each method are controversial. Intended hypothesis has not been clearly confi rmed.

Changes of Soil Aggregate Stability as a Result of the Effect of Freeze-thaw Cycles