Olga Cholewińska (with co-authors) published a paper in the Forests journal on changes in the species composition of oak-hornbeam communities in the Białowieża Forest over the course of seventy years. Directional changes of the species composition of oak-hornbeam communities were found as a result of an increase in the share of species with higher fertility requirements. Homogenization of species compositions of these communities was observed, which results in blurring the boundaries between them. These changes were associated with increased nitrogen deposition and an increase in the shade ability of the stand.
More details and work at: https://doi.org/10.3390/f11050545