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Effect of skiing and slope gradient on topsoil properties in an alpine environment

Hedl R., Houska J., Banas M., Zeidler M.

Polish Journal of Ecology

2012

Vol. 60, nr 3

491-501

Topsoil properties were studied in a ski slope at Petrovy kameny, Hruby Jesenik Mts. Effect of skiing was combined with a complex slope gradient, which comprised effects of vegetation type and soil horizons. Soil sorption complex and humification properties were expected to reflect both factors. Cation exchange capacity and to some degree saturation of adsorption complex were systematically lowered due to ski slope, and they were influenced also by vegetation type. C:N reflected vegetation type, but it reflected skiing only indirectly. The slope gradient significantly affected the soil sorption complex, yet contrary to our expectations. Several possible interpretations include species traits (litter decomposability, nutrient uptake) and patterns of topsoil horizon types, which can be associated to the history of the upper treeline.

Carbohydrate reserve changes in below-ground biomass of subalpine grasslands as a result of different snow conditions (Hruby Jesenik Mts., Czech Republic)

Zeidler M., Banas M., Duchoslav M.

Polish Journal of Ecology

2008

Vol. 56, nr 1

75-83

Carbohydrate concentration changes in below-ground biomass of subalpine tall grasslands with Calamagrostis villosa (Chaix) J.F. Gmelin were monitored during one year on the slope of Petrovy kameny Mt. (Hruby Jesenik Mts., Czech Republic). Stands of the community with natural snow conditions were compared with stands on a ski piste. Soil temperature development and snow melting times were also observed in the territory concerned. The difference was stated between mean annual temperature on control stands (4.21 [degree] C) and ski piste (3.95 [degree] C) in the upper 5 cm of soil. At the average, snow melted on the ski piste two weeks later than that on the natural stands. The natural stands and the stands on the ski piste differ significantly from each other in terms of development of carbohydrate accumulation in the below-ground biomass. Consumption of reserve carbohydrates by the plants at both the ski piste and in the natural stands was nearly similar during the winter. At the beginning of the growing season (July), significant difference in carbohydrate concentration in below-ground organs between stands on the ski piste and natural stands was observed. It was caused by late melting of the snow cover and subsequent delay of the phenologic development and assimilation of the vegetation in the ski piste. Later in season (August, October), the differences in carbohydrate concentration between stands at the ski piste and natural stands disappeared. The mean annual amount of carbohydrates in the upper (0-5 cm) and lower (5-10 cm) soil horizons in natural stands and ski piste stands do not differ fundamentally, except for the significant difference in July. The results obtained are discussed in view of abiotic environmental conditions, the plant physiology and strategy of the dominant species.