In the thesis we tried to discover how tree of heaven rejuvenates in preserved forests. We were interested how environmental factors and other tree species influence the rejuvenation of tree of heaven. The results show that tree of heaven very well rejuvenates in sites with greater proportion of the light and near seed trees. Tree of heaven fastly outgrow native species and occupy the upper social positions and cause a smaller proportion of indigenous species. Only black locust is able to outcompete it. To limit the spread of tree of heaven, we must in future pay more attention to forest management measures, which are already part of the existing forest management.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 4702630The contribution deals with potential distribution of Ailanthus altissima and presents the most endangered forest communities for its invasion. Results show that potential distribution of ailanthus in continuous surfaces in lowlands of the Sub-Mediterranean Slovenia, where winter temperatures and precipitation seasonality are relatively high, while temperature seasonality is low and slope is moderate. The most endangered are forests of pubescent and sessile oak on carbonate and terra rossa, hornbeam forests, riverine forest and submontane and thermophilous beech forests.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 39713837Non-native invasive species pose a significant risk, since a large part of non-native species becomes invasive, which has serious adverse effects on biodiversity with associated ecosystem services and have a negative impact on the overall society and economic activity. This requires that such species should be investigated and monitored. In this study we found that in Slovenia as problematic non-native invasive tree species could be considered the following species: Pseudotsuga menziesii (Mirb.) Franco), Pinus strobus L., Picea sitchensis (Bong.) Carr.), Chamaecyparis lawsoniana (A. Murray) Parl., Larix kaempferi (Lamb.) Carr., Juglans nigra L., Fraxinus americana L., Fraxinus pennsylvanica Marshall, Quercus rubra L., Populus × canadensis Moench, Acer negundo L., Ailanthus altissima (Mill.) Swingle, Robinia pseudoacacia L., Paulownia tomentosa (Thunb.) Stend.. In our study we found that the most invasive species are black locust (Robinia pseudacacia) and tree of heaven (Ailanthus altissima), so we are focused on these two species. We analyzed the rejuvenation process and figure out how they behave in preserved managed forests and what is the potentials of both species to spread in the future. We have prepared recommendations for silvicultural intervention in the situation of the presence of black locust and tree of heaven.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 40640557The aim of the presentation was to show what characteristics of forest stands make them susceptible for invasion of tree of heaven. The most susceptible forest communities appear in warm areas with pronounced climatic seasonality. Many differences occur in floristics and plant traits of forest communities in extreme positions, but in transitional areas, these differences are not so obvious. Susceptibility to invasion by tree of heaven is mainly influenced by macro-climatic conditions; in the transitional zone, communities thriving on shallow soils over carbonate bedrock are more vulnerable.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 40661037