Zamieranie jesionu wyniosłego (Fraxinus excelsior L.) w obszarze ochrony ścisłej Białowieskiego Parku Narodowego

Based on the research carried out in a core area of Białowieża National Park,it can be concluded that: (i) within twenty-six years the number of ash trees has been reduced by 82% – 99%, (ii) a sharp decline in the number of ash trees in the whole DBH class took place at the beginning of the 21st century, (iii) ash trees in the lower class of DBH died first, (iv) the intensity of ash dieback differed significantly between most humid: alder carr and mixed broadleaf bog forest, and less humid moist broadleaf forests.