@misc{Maciejewski_Zbigniew_Long-term_1998,
 author={Maciejewski, Zbigniew},
 editor={Polish Academy of Sciences. Institute of Ecology},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Dziekanów Leśny},
 howpublished={online},
 year={1998},
 language={eng},
 abstract={Work was done in 1993, in the strict reserve within Roztoczański National Park (East-Central Poland), on 4 permanent research plots representing the associations Dentario glandulosae-Fagetum Klika 1927 em. Mat. 1964, Abietetum polonicum (Dziub. 1928 Br.-Bl. et Vlieg. 1939) and Querco roboris-Pinetum Mat. W. 1981. Comparisons with studies from 1968 and 1978 revealed significant changes in stand structure, namely increases in the abundance and proportion by mass of beech Fagus sylvaticus and hornbeam Carpinus betulus, and a decline among fir Abies alba and the other species of major importance in the associations studied. The rate of the observed changes had increased markedly in the most recent period of study.},
 type={Text},
 title={Long-term changes in the abundance and mass of the main tree species in beechwood and fir forest communities of Roztoczański National Park (East-Central Poland)},
 URL={http://rcin.org.pl/Content/98262/PDF/WA058_90640_P2840-T46_Eko-Pol-A-Nr-2.pdf},
 volume={46},
 number={2},
 journal={Polish Journal of Ecology},
 publisher={Polish Academy of Sciences. Institute of Ecology. Publishing Office},
 keywords={natural forest, species composition, stand structure, beech Fagus sylvatica, hornbeam Carpinus betulus},
}