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1 2002

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Wpływ lasu grądowego na czas zalegania i grubość pokrywy śnieżnej w Białowieskim Parku Narodowym (komunikat)

Żarnowiecki G.

Czasopismo Techniczne. Środowisko

2002

R. 99, z. 4-Ś

133--134

An analysis of the variability of the snow cover was made in 4 different types of Tilio-Carpinetum communities in the Białowieża National Park, transitional area between Central Europe and North-East Europe. Thickness of the snow cover was measured in the period of 25 winter seasons (1963/64-1987/88) on a system permanent study areas. Mean thickness of the snow cover for winter season was from 9,8 to 11,4 cm in the forest communities and 11,7 cm in open area. The snow cover in plant communities occurs from 7 to 14 days more than outside the forest. From the beginning of winter to March thickness of the snow cover is greater in the open than in the forest, while in the rest of winter the snow cover in the forest showing greater thickness. It was found that in each all sub-associations of Tilio-Carpinetum, settlement of the snow cover towards the end of winter and then its melting and exposure of the soil occur on the same sites. The snow cover thickness and its duration are largely dependent on the density of tree crown canopy.