Changes in similarities of five forest communities and of open space taking place during the year were analyzed in the scope of twelve daily and monthly characteristics of air temperature. The density of tree crowns having impact on the level of solar radiation reaching the ground during the day and the level of long term nocturnal emissions is the most important factor shaping thermal conditions in the forest.
Two coniferous forest communities were selected for analysis: a marshy coniferous forest and a young spruce forest, both located in the Borecka Forest. Thermal conditions develop differently in each community during the spring, due to different tree crown closure, which influences the amount of direct solar radiation reaching the substratum. Soil humidity is another factor influencing the air temperature, since the capacity and thermal inertia of the soil depend on its humidity. The results of the study are compared with thermal conditions outside the forest.
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