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Povzetek: The nature reserve Mykhailivska Tsilyna is located in Sumy region, in the northern part of Forest-Steppe zone of Ukraine. The area of virgin northern meadow-steppe is protected there. A new, large-scale vegetation map (scale 1:10000) of the reserve (the first one in its new borders) had been created. The main units of mapping are complexes of plant communities in ranks of associations, subassociations and variants. In total, 27 such complexes and 10 units of another rank have been identified. The map shows vegetation cover changesover a period of strict protection (2011–2023). The most common classes of vegetation in the reserve are: Molinio-Arrhenatheretea, Artemisietea vulgarisandFestuco-Brometea. Main changes in the vegetation cover of the reserve’s old territory are manifested in the form of steppe transformation: from meadow-steppe areas to more mesic shrub-steppe with dominating Cytisus ruthenicus and forb communities with dominating Euphorbia semivillosa. In these communities can be seen a decrease in the share of tussock grasses and an increase in the share of rhizomatous grasses. The same process is occurring in the reserve’s new territory, but phytocenoses are different there.
Ključne besede: vegetation mapping, steppe vegetation, vegetation dynamics, problems of strict protection regime in the steppe
Objavljeno v DiRROS: 24.01.2026; Ogledov: 433; Prenosov: 886
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Povzetek: The herbaceous understory represents a key component of forest biodiversity across temperate forests of Europe. Here, we quantified changes in the diversity and composition of the forest understory layer in representative Slovenian forest ecosystems between 2004/05 and 2014/15. In total, 60 plots were placed across 10 different managed forest types, ranging from lowland deciduous and mid-altitude mesic mixed forests to mountain conifer forests. This network is part of an international network of sites launched within the ICP Forests Programme aimed to assess the condition of forests in Europe. To examine how disturbance influenced understory dynamics, we estimated the disturbance impacts considering both natural and/or anthropogenic disturbances that cause significant damage to trees and to ground-surface layers, including ground-vegetation layers and upper-soil layers. Species richness across 10 sites (gamma diversity) significantly decreased from 272 to 243 species during the study period, while mean species richness per site did not significantly change. The mean value of site level Shannon diversity indices and evenness significantly increased. The cover of most common plant species increased during the monitoring period. The mean value of disturbance estimates per site increased from 0.8% in 2004/05 (ranging from 0% to 2.5%) to 16.3% in 2014/15 (ranging from 5.0% to 38.8%), which corresponded to a reduction in total vegetation cover, including tree-layer cover. More disturbed sites showed larger temporal changes in species composition compared to less disturbed sites, suggesting that forest disturbances caused understory compositional shifts during the study period. Rather than observing an increase in plant diversity due to disturbance, our results suggest a short-term decrease in species number, likely driven by replacement of more specialized species with common species.
Ključne besede: vegetation dynamics, vascular-plant diversity, understory layer, disturbance, monitoring, temperate forests
Objavljeno v DiRROS: 27.11.2019; Ogledov: 3577; Prenosov: 2399
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