Climate response to forest management in beech stands

BARNA, M., SCHIEBER, B. 2011. Climate response to forest management in beech stands. Folia oecol., 38: 8-16. This work summarises the climatic data assembled in five submountain beech forest stands with different cutting patterns. The highest mean monthly air temperature values in March-July were obtained on a plot with 20-year-old beech thicket (T); in August-October on a stand after light shelterwood cuts (L) and in November-February in a closed stand (C - control). On the contrary, in the summer months June-July the C manifested the lowest temperature values, while in the winter (October-February) the temperature was the lowest on the open area (OA). The maximum one-hour (12-min averages were recorded) temperature increased with decreasing stand density of parent trees. The highest temperature value making 33.3 °C was measured in T, in OA reaching at the same time 32.9 °C, while on the C only 28.9 °C. The highest mean daily temperature showed a similar trend. Maximum soil temperature at a depth of 5 cm on the C occurred from the end of July to the beginning of September. The same hold for this variable on T but with the values lower by about 0.5 °C. The soil temperature at 20 cm had the peak not sooner that in the first ten-day period of September. During the whole period, the difference between the rainfall on OA and the throughfall in the C was statistically significant (P ≤ 0.05). The highest monthly air humidity was always found on the OA, or on the T without parent stand (with variation from 72% in April to 95% in November). The lowest mean air humidity was observed in the densest adult stands: in March-October on plot L and in November-February (after the leaf fall) on the control. Key words. air and soil temperature, humidity, shelterwood cut, stand density, throughfall.

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