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Changes in the seasonal rhythm of two plant phytocoenoses in a submountain beech forest during secondary succession were studied. Investigations were done on four monitoring plots with different stand density over the period of four successive years. The rhythm of the associations Dentario bulbiferae-Fagetum and Carici pilosae-Fagetum reflects the course of succession processes running six years after the human impact (cutting) in the ecosystem. Results of the phenological observations of the understorey species with the focus on the changes in flowering and colour spectrum allowed to make the comparisons between both associations in connection with different phyto-climatic conditions and in dependence on time. The most conspicuous changes in the seasonal rhythm and structure of the examined associations were found in conditions of the former clear-cut, currently in succession phase. A clear decrease (56%) in number of taxons with the dominance &gt; 1% in one association towards the end of the 4-year study period was detected here. Simultaneously, a decrease in the number of flowering species was observed, while the relative rate of species being in the vegetative stage increased considerably (from 6 to 67%) over the growing season. The course of flowering of both of the associations missed discernible trends and peaks as well as colour spectra were partially changed during four monitored successive years on the formerly unstocked area.

Changes in the seasonal rhythm of two forest communities during secondary succession