Institute of the Republic of Slovenia for nature conservation, Pobreška cesta 20, 2000 Maribor, Slovenia
The purpose of the action plans is to minimise the negative impact of invasive alien plants on biodiversity, especially on the specific valuable natural features of the Landscape park Tivoli, Rožnik and Šišenski hrib. The Landscape park encompasses 459 ha of hilly, forested land and a city park Tivoli in the southwestern part of Ljubljana, the capital of Slovenia. Only the western part of the park is opened to agricultural land, however, on the North, South and East the area around the park is highly urbanised. The park is very popular among citizens for recreational and relaxation purposes. About two million people visit the park every year. Despite all the pressure on nature, there are still few biodiversity important sites well preserved. Two small transition mires with typical species are located at the foot of the hills. These transition mires are at the southern border of their European range. Classical locality of Pseudostellaria europaea is situated near the Tivoli city park.
Non-native species have been intentionally planted in the forest and especially in the city park. There are various collections of ornamental plants in the Tivoli city park. The urban area with many “green areas” surrounding the Landscape park is also a reservoir of alien plants. Animals, wind and people are the most common vectors for their spread. Therefore, invasive alien species present one of the most important threats to biodiversity of the Landscape park Tivoli, Rožnik and Šišenski hrib. Since the ice storm in 2014, when many trees were damaged and afterwards felled, invasive plants are spreading at an accelerated rate.
The action plan has been prepared through the LIFE ARTEMIS project. In 2017, alien plant inventory was compiled by volunteers. Training and the alien plant inventory manual were prepared for them. The experts from the project group supervised the inventory and helped the volunteers. The central IAS information system (www.invazivke.si) developed in the project was used for the collecting data. The inventory was created using selected transects near the paths. Priority species and areas for eradication and management were selected through the analysis of frequency of the species and importance of the area for biodiversity and its vulnerability. Stakeholders were invited to co-operate in the preparation of the action plan.
Across the whole area, 51 different alien species were detected, and at least five are widely spread, so eradication is no longer possible. On the other hand, seven species were detected in less than 10 locations, so their eradication is still feasible. Ten species which are not widely spread were selected for eradication action carried out with the help of the volunteers in 2018. For these species, the most effective methods for eradication with minimal side effects were chosen. Priority areas are Classical locality, transition mires and in the vicinity of the paths. For long term success monitoring, ten years and further is recommended.
Grošelj A., Kepic B., Podbrežnik A. & Danev G. (2015) Strokovni predlog za zavarovanje Tivolija, Rožnika in Šišenskega hriba. Zavod RS za varstvo narave, OE Ljubljana.
Marinšek A., de Groot M., Ogris N., Kutnar L., Verlič A., Kus Veenvliet J. & Rozman S. (2018) Poročilo o popisu tujerodnih rastlin v urbanem gozdu Krajinskega parka Tivoli, Rožnik in Šišenski hrib v sodelovanju s prostovoljci. Projekt LIFE ARTEMIS, poročilo o izvedbi akcije B4. Gozdarski inštitut Slovenije, Zavod RS za varstvo narave in Zavod Symbiosis, Ljubljana.