SILVA GABRETA 11 (1)

Maria Hojdová, Martin Hais & Jan Pokorný

Microclimate of a peat bog and of the forest in different states of damage in the Šumava National Park

Abstract

The study deals with the comparison of the microclimate of damaged and healthy forest in the Šumava National Park, in connection with the interventions against bark beetle. In the living forest, dead forest, clearing and peat bog, temperature of soil and temperature in stands were recorded continuously during two vegetation seasons (2002 and 2003) and air humidity in 2003. The stations were situated in the Luzenské Údolí valley and close to Novohuťské Slatě peat bog. The results show clearly that the temperature fluctuations are lowest in the living forest. The maximum daily temperature amplitude in the living forest reached 17.9 °C above the herbal floor, in contrast to the other stations, where the temperature amplitudes were much higher – in the dry forest on average by 14.5 °C, in the peat bog by 11.5 °C and in the clearing by 16.7 °C. The highest daily temperature amplitude from all the observed stations was in the peat bog, 42.7 °C in 2002 and 50.2 °C in 2003. Measurements in stands were supplemented with satellite pictures in the infrared scale to show the distribution of temperatures in the whole area at a given time. The coolest structures appear to be the areas of living forest; on the contrary, the hottest are clearings and the dry forest area. The measured data are discussed in terms of radiation balance and water cycle.

Key words:
dying forest, microclimate, peat bog, remote sensing, temperature amplitudes

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