Attitudes to tree removal on private properties in two Polish cities.

Large cities are increasingly faced with declining urban tree cover and related problems, such as increased urban heat islands and flash floods. Reducing these phenomena increasingly has to rely on trees located on private property. However, to effectively engage private landowners on these issues, more attention must be paid to understanding their perceptions of urban green spaces. For example, what do they understand concerning ecosystem services provided by urban forests? What are their attitudes to legal regulations of tree removal on private property? What factors influence respondents' points of view? These are just some of the issues that need to be considered. The data from this study allows for a better understanding of these issues on many different levels, based on a case study of two Polish cities: Poznań and Gdańsk. A geo-questionnaire, consisting of an internet based survey combined with an interactive web-map, was conducted in the summer of 2020, with spatial information consisting of the respondent's place of residence, locations of trees that confer important Ecosystem Services (ES), and suggestions for places to plant trees. In addition, the survey collected information concerning respondents’ personal characteristics, their opinion of regulations affecting private-property tree removal, their attachment to the location where they live, as well as questions related to their ecological concerns. Respondents were informed about the research through the local press and on social media (Facebook). Data are presented in aggregate form in hexagonal units with an area of approx 34,6 m2.

大型城市正日益面临城市林木覆盖率下滑及衍生问题，诸如城市热岛效应加剧与城市暴洪频发。缓解此类现象的压力愈发依赖分布于私有土地上的林木资源。然而，若要有效推动私有土地所有者参与相关议题的协作，必须强化对其城市绿地认知的研究。例如，受访者如何理解城市森林所提供的生态系统服务（Ecosystem Services, ES）？他们对私有土地伐树的法律法规持有何种态度？哪些因素会影响受访者的观点？这些仅是亟待系统考量的部分核心议题。本研究以波兰两座城市——波兹南（Poznań）与格但斯克（Gdańsk）——为案例，其调研数据可从多维度深化对上述议题的认知。2020年夏季，研究团队开展了一项结合交互式网络地图的地理问卷调查（geo-questionnaire），收集的空间信息涵盖受访者居住地点、提供关键生态系统服务的林木分布位置，以及植树选址建议。此外，问卷还采集了受访者的个人特征、对私有土地伐树相关法规的看法、对居住场所的依恋程度，以及与生态关切相关的多项问题。本次调研通过当地报刊与社交媒体平台（Facebook）向目标群体进行宣传。最终数据以六边形单元进行聚合呈现，单个六边形单元的面积约为34.6平方米。