It has been substantiated that the increase in the concentration of heavy metals in the environment has especially aggravated in the conditions of military operations on the territory of Ukraine. The use of woody plants for the purposes of phytoremediation is one of the most effective options for optimising the state of the environment in urban ecosystems, regardless of the nature and source of contamination by metallic elements, which is of significant relevance in the conditions of post-war environmental restoration of Ukraine. The purpose of the study is to explore the peculiarities of some heavy metals accumulation by the assimilation apparatuses of the black locust (Robinia pseudoacacia L.) plants growing in the recreational areas of the city of Dnipro in order to further optimise tree plantings with the aim of improving the environment. The content of heavy metal elements (Cu, Zn, Pb, and Cd) in the biomass of the Robinia pseudoacacia L. leaves and in the soils of Dnipro recreation areas has been determined. The intensity of the accumulation of heavy metals in the phytomass of the Robinia pseudoacacia L. represents the following sequence Zn > Cu > Pb > Cd, which demonstrates a more intense absorption and accumulation in the phytomass of the leafy fraction of Zn and Cu in the phytomass of the deciduous fraction, and less significant of Pb and Cd. With the help of geo-information systems, cartographic material has been developed. It demonstrates the concentration gradient of Pb, Cu, Cd, and Zn in the assimilation organs of the black locust plants in the city of Dnipro recreational areas. Based on the cartographic analysis, it has been proved that the general condition of the soils in the recreation areas of Dnipro is characterised by significant disproportions in the level of pollution. The maps show the existing potential of the accumulative capacity of Robinia pseudoacacia L. to deposit Pb, Cu, Cd, and Zn, which allows for additional city functional zoning by considering phytoremediation functions of the existing and planned green spaces.
Postindustrial agglomerations struggling with image deficits and environmental problems are looking for new development paths to take. One of these paths can bring about the development of business tourism, including the industry of the organisation of meetings and events. The unique and attractive character of the place can favour taking such a direction. The business tourism sector can therefore become an instrument contributing to the sustainable metropolisation of the city by building up its position in the global network of flows. The development of the meetings and events sector allows, therefore, for a change of image, for a re-evaluation of endogenous resources, including those relating to the industrial past, and for tapping into the unlimited resources of the global network. Increased attention in this network may lead to an influx of more events, and of investors as well. Replacing heavy industry with an enlarged service sector and modern industry based on flexible and innovative small and medium-sized enterprises fosters sustainable development. The meetings and events industry can become a tool for sustainable development and the promotion of its ideas, related to the UN Sustainable Development Goals (SDGs). The trajectory outlined above seems very promising. However, to some extent, it is just a hypothesis. The author undertakes to test it on the example of Katowice, a former industrial city which has decided to follow the route outlined above to become a city that hosts many events, including the COP24 summit in 2018. In the article, the author presents empirical research studies whose authors tried to determine whether the path the city has chosen has a real impact on its image and development. The author also deals with the question of the sustainability of such a development path and the conditions for its self-support in the context of the COVID-19 pandemic crisis.