Canopy gaps in two virgin beech forest reserves in Slovakia
Droessler, L.(University of Goettingen (Germany). Inst. of Silviculture)E-mail:[email protected] | Von Luepke, B.
The formation, size distribution and percentage of gaps (openings in the canopy above 2/3 of stand height) in two virgin deciduous forests are presented in two case studies. The gaps comprised 16% of the forest area in Havesova Reserve (HR) and 14.6% of the forest area in Kyjov Reserve (KR), Czech Republic. The estimated turnover time was 220 years. More than half of the gaps were caused by the death of one tree, 80% of the gaps were due to the death of up to 3 trees, 85% of the gaps were smaller than 250 square m. The largest gap in HR resulted from the death of 56 trees over the last 40 years (0.40 ha), the largest gap in KR was caused by the death of 80 trees over the last 40 years (0.44 ha). An attempt was made in HR to date the death of the trees that were still visible in the gaps, 1/5 of the trees initiated gaps by their death, whereas 4/5 of the trees extended gaps. Uprooted trees dominated in HR, breakage was most common in KR.
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