Biological, ecological and landscape characteristics of black locust (Robinia pseudoacacia L.) used in green spaces of the city of Knin.
The black locust (Robinia pseudoacacia L.) is a fast-growing deciduous tree originating from North America that was imported to Europe at the beginning of the 17th century. It is highly valued in beekeeping, wood industry, forestry and is a highly invasive species. It is most widespread in Northeast Croatia. The species has ornamental features and it is also used in ornamental horticulture. During April and May of 2016 in the territory of the city of Knin a low representation of this species was observed on gardens, yards and green areas. Concerning the maintenance, more care is needed to increase the aesthetic value of this tree species, as it currently ranks as mediocre. The invasiveness of the species also needs to be highlighted and it is reflected in its presence in specific non-landscape areas (freely growing vegetation by the road, forest edges, the railways, etc.). The worst activity of black locust invasiveness is suppression of autochthonous species. Using the survey method the respondents from the territory of the city of Knin and its outskirts evaluated the attractiveness, the agreeableness and the impact of black locust on human mental health with very good grades. They evaluated the use of black locust in economy, landscape picturesqueness and the existing city tree avenues and trees with slightly lower grades (3.40-3.58). Over 80% of those surveyed are aware that black locust is a highly melliferous species and that it is also used in wood industry.