Based on data from the Slovenia Forest Service, we studied the distribution and growth of black locust in the Sežana Forest Management Region. Using forest stand maps, we analyzed its distribution in two periods and monitored changes over time. From permanent sample plot data, we calculated the average annual diameter and volume growth increments of black locust and several other common tree species. Our findings indicate that stands with black locust presence account for 12% of the total forest area. However, this area has decreased from the period 1998–2007 to the period 2014–2023. Compared to other common tree species, black locust exhibits higher average annual diameter and volume growth increments, surpassed only by Norway spruce. Despite results suggesting that the spatial distribution of black locust has declined in recent decades, this does not necessarily mean that the trend will continue. Climate change and its associated impacts could potentially lead to the expansion of black locust into new areas.
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