This paper discusses the basic ecology, potential invasiveness, regeneration, distribution, and characteristics of northern red oak (Quercus rubra L.) in Slovenia. In a pure northern red oak stand in Panovec, we analyzed tree composition and regeneration coverage using plot transects (three 4 × 4 m plots per transect) leading from the parent stand into neighboring, predominantly sessile oak stands. We found that northern red oak regenerates well within a 50 m range from the parent stand, with an average density of about 40,000 seedlings per hectare. Regeneration coverage of northern red oak at the edge of the parent stand was 79%, decreasing to 21% at a distance of 50 m, while sessile oak regeneration coverage increased from 4% at the edge to 39% at 50 m. The spread of northern red oak beyond parent stands is relatively limited and can be controlled by regular silvicultural measures. The goal in such areas is to establish mixed stands that include northern red oak, which grows rapidly, is resilient to climate change, and produces high-quality timber.
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