Natural regeneration of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) in forest stands of Hurky Training Forest District, Higher Forestry School and Secondary Forestry School in Pisek
2007
Busina, F.,VOSL a SLS Bedricha Schwarzenberga, Pisek (Czech Republic)
The aim of this study was to characterize favourable conditions for the natural regeneration of Douglas fir and for the subsequent growth of self-seeding and advance regeneration. The forest stand is situated at 430 m above sea level in an area with mean annual temperature 7.3-7.5 deg C and mean annual total precipitation 550-575 mm. Naturally regenerating trees of the mean density of 53,800 seedlings/ha appeared due to lateral light coming from the north under the forest stand dominated by Douglas fir (65 years of age). The highest density of the naturally regenerating Douglas firs was noticed at the distance of 10-14 m from the stand margin. The light penetrating from the stand margin influenced the density of the newly developed trees much more than the shading by the parent stand. The height increment of advance regeneration depended on the distance from the stand margin, it was greater near the stand margin than further under the trees. The comparison with spruce shows that Douglas fir is less light-demanding. In conclusion, Douglas fir successfully regenerates in the stand studied and the proportion of Douglas fir in the new forest stand will be sufficient.
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