Vesa Yli-Pelkonen

Using the ecosystem services approach for better planning and conservation of urban green spaces: a Finland case study

Ecosystem services are vital for humans in urban regions. However, urban development poses a great risk for the ability of ecosystems to provide these services. In this paper we first address the most important ecosystem services in functional urban regions in Finland. Well accessible and good quality recreational ecosystem services, for example, provided by urban nature, are an important part of a high-quality living environment and important for public health. Vegetation of urban regions can have a role in carbon dioxide sequestration and thus in climate change mitigation. For instance, estimates of carbon sinks can be compared to total CO2 emissions of an urban region, and the municipality can aim at both increasing carbon sinks and decreasing CO2 emissions with proper land-use planning. Large and contiguous core nature areas, smaller green areas and ecological connections between them are the essence of regional ecological networks and are essential for maintaining interconnected habitats for species and thus biological diversity. Thus, both local and regional level ecological networks are vital for maintaining ecosystem services in urban regions. The impacts of climate change coupled with land-use and land cover change will bring serious challenges for maintaining ecosystem services in urban areas. Although not yet widely used in planning practices, the ecosystem services approach can provide an opportunity for land-use planning to develop ecologically sustainable urban regions. Currently, information on ecosystem services of urban regions is lacking and there is a need to improve the knowledge base for land-use planning.

Does urban vegetation mitigate air pollution in northern conditions

It is generally accepted that urban vegetation improves air quality and thereby enhances the well-being of citizens. However, empirical evidence on the potential of urban trees to mitigate air pollution is meager, particularly in northern climates with a short growing season. We studied the ability of urban park/forest vegetation to remove air pollutants (NO2, anthropogenic VOCs and particle deposition) using passive samplers in two Finnish cities. Concentrations of each pollutant in August (summer; leaf-period) and March (winter, leaf-free period) were slightly but often insignificantly lower under tree canopies than in adjacent open areas, suggesting that the role of foliage in removing air pollutants is insignificant. Furthermore, vegetation-related environmental variables (canopy closure, number and size of trees, density of understorey vegetation) did not explain the variation in pollution concentrations. Our results suggest that the ability of urban vegetation to remove air pollutants is minor in northern climates.

Linking ecological and social systems in cities: urban planning in Finland as a case

The loss of urban green space as a result of urbanization threatens the overall biodiversity of urban areas, and prompts us to consider the importance of existing urban nature more carefully. Because urban ecological systems are in intense interaction with human-social systems, it is fruitful to create an interdisciplinary research and planning framework to ensure the maintenance of biodiversity in urban areas. For this purpose, we adapted a suitable theoretical and conceptual scheme for the setting of Finnish urban development, which provides an example of a situation where a lot of nature has so far remained inside and around urban area. The adapted scheme focuses on the land use change as a result of urban land use planning and development, and may provide a way to address the important variables and feedback mechanisms between information flowing from ecological systems and drivers from the social system. Furthermore, we outlined a more specific framework around the Finnish urban detailed planning process in order to study the interactions between these systems further. After addressing ecology-oriented questions of quantity, quality and needs of urban nature, and human-oriented drivers, such as flow and incorporation of information, knowledge, values and institutions, we identified several challenges in integrating the components of ecological and social systems. Creating common conceptual ground for different actors and disciplines, improving communication in the process, matching contradictory values and perceptions, and improving stakeholder participation would be in the best interest of nature and people of urban areas.

The Role of Local Ecological Knowledge in Sustainable Urban Planning: Perspectives from Finland

Abstract paper This is a study of the role of local ecological knowledge (LEK) as lay-expert knowledge in the urban land use planning process in Finland. The research addresses the importance of LEK, and the ways LEK is obtained and used. To obtain data, planning officials, biologists, and representatives of resident and nature associations were interviewed in the Helsinki metropolitan area. The results indicate that LEK exists among nature enthusiast, as well as local residents, and planners can obtain the knowledge in several ways, most notably through networks of knowledgeable key informants and local nature associations. Considering LEK in urban planning is important because it complements scientific ecological data and indicates places important to locals. Some of the challenges of using LEK include collecting it through participatory planning processes, distinguishing it from other information, valuing subjective knowledge, and empowering planning officials to use LEK. To enhance communication between stakeholders, social scientists should be integrated in the planning process. Furthermore, technical improvements, such as registers of key informants and more efficient use of nature associations’ knowledge, would be useful in applying LEK.

Ecosystem Services Criteria For Sustainable Development In Urban Regions

The ecosystem services criteria for strategic decision-making combine conceptualisation and concretisation of ecologically sustainable development. A concrete basis for the measurement, valuation, and assessment of ecological sustainability was created through the development of two-level criteria for ecosystem services, which were linked to indicators based on spatial and statistical data from the Monitoring System of Spatial Structure (MSSS) and the CORINE Land Cover database. The criteria were designed for middle-sized urban regions because urban areas face the greatest land changes, threats, and management and co-operation needs related to maintenance of ecosystem services. Two urban regions were piloting the criteria in an iterative process between researchers and project groups of urban planners. Data availability and poor capacity to deliver data for the regions affected the choice of final indicators. This highlights the need for development of planning tools for practical planning and impact assessment for ecological sustainability of all urban regions.

Ecological information in the political decision making of urban land-use planning

The objective of this paper is to examine what factors determine the importance of ecological information in political decision making of urban land use in Helsinki, southern Finland. Results from the interviews of politicians and city officials show that ecological information becomes more important if there are significant conservation values connected to a plan area, contacts and appeals from plan participants, strong media attention or if a decision maker focuses more on the issue due to personal interests and values. Balancing the weight of recreational and cultural values may be one of the most difficult tasks for decision makers to handle.

The role of stream ecosystems in urban planning: a case study from the stream Rekolanoja in Finland.

Purpose – Urban stream ecosystems have often been seen as channels of water flow rather than as the valuable parts of an urban green space system providing ecosystem services. The study seeks to address the importance of urban stream ecosystems from the perspective of urban ecology, human health and social well‐being in the context of urban planning.Design/methodology/approach – The case study area is the Rekolanoja stream ecosystem in the City of Vantaa, southern Finland. The data from the case study area were gathered from existing ecological studies and by conducting semi‐structured interviews, a resident inquiry and a writing contest.Findings – The results from the Rekolanoja case show that intense management of the streamside vegetation and treatment of the stream channel in construction projects have decreased species richness and diminished valuable streamside biotopes. However, the stream corridor can function as an important recreational and educational element within the local green space networ...

Gaseous polycyclic aromatic hydrocarbon concentrations are higher in urban forests than adjacent open areas during summer but not in winter – Exploratory study

While the potential of plants to uptake polycyclic aromatic hydrocarbons (PAHs) is widely acknowledged, empirical evidence of the effects of this process on local atmospheric PAH concentrations and human health is tenuous. We measured gaseous PAH concentrations using passive samplers in urban tree-covered areas and adjacent open, treeless areas in a near-road environment in Finland to gain information on the ability of urban vegetation to improve air quality. The ability of urban, mostly deciduous, vegetation to affect PAHs was season dependent: during summer, concentrations were significantly higher in tree-covered areas, while in the fall, concentrations in open areas exceeded those in tree-covered areas. During winter, concentrations in tree-covered areas were either lower or did not differ from those in open areas. Results of this study imply that the commonly believed notion that trees unequivocally improve air quality does not apply to PAHs studied here.

Importance of recreational ecosystem services in Helsinki, Finland

Purpose – Land‐use and cover change threatens remaining urban green areas and the provision of ecosystem services. The purpose of this paper is to address the importance, sufficiency and needs of local recreational ecosystem services in urban areas.Design/methodology/approach – The case study area is the City of Helsinki, Finland. In total, 30 key informants representing 19 neighbourhood associations in the urban‐rural gradient within the city were interviewed.Findings – The results of the Helsinki case show that residents visit the focused nature areas frequently and spend considerable amount of time there. All the mentioned activities during visits were associated with getting recreational experiences. Of these the most frequently mentioned were getting “feel‐good feeling” and physical exercise, which were closely associated with walking and sports‐like activities. The importance of easy accessibility to local nature areas was emphasized. Recreational ecosystem services partly result from specific lands...

Environmental justice for the governance of aquatic environments

ABSTRACT Environmental justice sheds light on the distributive and procedural aspects of planning and decision-making. We examined the challenges arising from the perspective of environmental justice on multi-level and participatory environmental governance by exploring the governance of aquatic environments in the Helsinki Metropolitan Area. We found three main challenges and potential responses to them. First, even though most of Helsinki’s shoreline is free and/or accessible by road and accordingly used actively by people for recreational purposes, many parts of the shoreline are perceived as inaccessible, reflecting a need to combine factual and perceived accessibility of aquatic environments in detail during the planning processes and to discuss reasons for possible discrepancies between these two. Second, there was a remarkable seasonal variation in the use of aquatic environments, so more attention should be paid to social-demographic factors explaining the distribution of the use of urban nature. Third, it seems to be difficult to capture the variety of perceptions of people and to integrate them into planning and decision-making processes even on a local scale, and this challenge is likely even more pronounced on higher levels of planning and governance. Thus, better integration of regional and local-scale planning procedures should be encouraged. Building on these observations, we conclude that integration of procedural and distributive environmental justice into the practices of the governance of aquatic environments could remarkably decrease unwanted trade-offs and potential conflicts in their use and management.