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The Impact of Recreational Pressure on Urban Pine Forest Vegetation in Riga City, Latvia

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The Impact of Recreational Pressure on Urban Pine Forest Vegetation in Riga City, Latvia Issue 4, Volume 6, 2012 406 The impact of recreational pressure on urban pine forest vegetation in Riga city, Latvia Inga Straupe, Ilze Jankovska, Solvita Rusina, Janis Donis and the well-being of its residents. Urban forests can strongly Abstract: - The article focuses on the analysis of impact of influence the physical/biological environment and mitigate recreational pressure on Myrtillosa type pine forest vegetation many impacts of urban development by moderating climate, in Riga city, Latvia. The composition of the plant conserving energy, carbon dioxide, and water, improving air communities, projective coverage of tree, shrub, herb and quality, controlling rainfall runoff and flooding, lowering noise moss layer as well as the coverage of each separate species and levels, harboring wildlife, and enhancing the attractiveness of plant strategy types has been evaluated. All urban Myrtillosa cities. In an urbanized society, urban green areas are important type pine forests can be divided into two groups – unimpacted as a place for contact with nature. The level of biodiversity of and impacted pine forests. Insignificant changes of forest urban green areas is often surprisingly high, representing environment are preserved in in three plant communities 1 - nature close to where people live. Urban forests can be viewed Pyrola rotundifolia-Pinus sylvestris (Bulli and Mangalsala), 2 as a ’living technology’, a key component of the urban – Pleurozium schreberii-Pinus sylvestris (Bolderaja, Jaunciems and Smerlis), 3 – Calamagrostis epigeios-Pinus infrastructure that helps to maintain a healthy environment for sylvestris (Jugla and Bikernieki). Significant changes and urban dwellers and stability of urban ecosystems [1]-[5]. degradation are observed in other three plant communities of Forests are prominent components of the landscape in most impacted pine forests: 4 – Amelanchier spicata-Pinus urban areas, at the same time urban forests provide a wide sylvestris (Kleisti, Katlakalns, Sampeteris and Ulbroka), 5 – range of recreational and outdoor leisure opportunities. Acer platanoides-Pinus sylvestris (Imanta); 6 – Cotoneaster Reduced stress and improved physical health for urban lucidus-Pinus sylvestris (Mezaparks, Vecdaugava and residents have been associated with the presence of urban Babelite. Vegetation analyses didn't confirm the predicted forests. Urban forests also have high educational values by model of spatial distribution of forest recreational visits/year representing nature and natural processes in cities and towns, on foot. Further research is needed in order to obtain more and they have often been used as testing and education areas precise results that take into consideration the missing for forestry and other disciplines [2]-[4], [6]. parameters of environmental, site and social attributes. The role of urban green spaces differs widely between European cities and towns due their different environmental Keywords— Myrtillosa type pine forest, recreational pressure, and socio-cultural background. In Latvia, as in other countries Riga city, urban forest vegetation. of North Europe, the decline of nature throughout the twentieth century and the alienation between people and I. INTRODUCTION natural world were not so significant. The recreational and RBAN areas include greenspaces which include aesthetic benefit of urban forests is traditionally important U substantial forest resources that have the potential for especially in the Nordic and Baltic countries, because the significantly improving the quality of the urban environment forest is a major element of the landscape and national economy [5], [7]. At the same time urban forests are a part of a Manuscript received June 2, 2012: Revised version received …... (Write complex environment, complicated diverse and interconnected the dates on which you submitted your paper for review as well as the revised version). The research was carried out in the framework of the project ecosystems, which consist of groups of trees, shrubs, herbs, ‘Support system of decision making in sustainable forest resource mosses, lichens, animals, as well as microorganisms and soil, management planning’ (agreement No. 2010/0208/2DP/2.1.1.0/10/APIA which are interrelated and influence each other and the /VIAA/146, ERAF/ Latvia University of Agriculture). environment. Unorganized recreation and excessive recreation I. Straupe Department of Silviculture, Forest Faculty, Latvia University of loads cause significant disturbances to forest ecological Agriculture, Akademijas street 11, Jelgava, Latvia (corresponding author to functions for example changes in soil, forest, forest vegetation provide phone: 371-2944-2520; fax: 371-630-21619; e-mail: and lighting, as a result of which mosaic type forest structure is [email protected]). I. Jankovska, Department of Silviculture, Forest Faculty, Latvia University formed – disturbed and undisturbed forest compartments [8]- of Agriculture, Akademijas street 11, Jelgava, Latvia (e-mail: [15]. [email protected]). Over the last decades in urban forests particularly especially S. Rusina University of Latvia, Faculty of Geography and Earth Sciences, Alberta street 10, Riga, Latvia (e-mail: [email protected]). sensitive pine forests, as a result of anthropogenic J.Donis Latvian State Forest Research Institute ‘Silava’, Rigas street 111, disturbances, the forest ecosystem is changing and even Salaspils, Latvia (e-mail: [email protected]). INTERNATIONAL JOURNAL of ENERGY and ENVIRONMENT Issue 4, Volume 6, 2012 407 degrading considerably [16]. The urban environment provides pattern elements of forest and technical aspects of forest a unique opportunity to meld landscape design with ecological management. The legislation does not specify differences management, therefore the objective is to develop the stability between maintenance and management of rural and urban of the stand, its recreational properties ensure forest functions forest, and there are disagreements between management, and protection against degradation and to develop the functional significance and demands for real use of urban respective infrastructure, which would increase the forest forests. accessibility and at the same time preserve its biological values Riga city forests consist of 15 forest tracts which are [12], [14], [17], [18]. connected with rural forests and some small, isolated forests – Several approaches for assessment of the recreational the remnants of ancient forest or planted forests (Fig. 1). The pressure on urban forests have been used, including both direct main tree species is Scots pine Pinus sylvestris L. (46.9 km2 or measures of vegetation (e.g. percentage cover of vegetation on 88% of total forest area) on the poor sandy soil and is trampled and undisturbed sites, functional trait composition) characterized by landscape attractiveness to recreational and indirect measures, like number of residents within an area pressure. [19]. The knowledge about relationship among recreational load assessed from social data (e.g. interviews) and real condition of vegetation of hemiboreal forest types in urban areas is not well known. This information is needed for the purposes of urban planning and management with the aim to preserve indigenous forest vegetation in urban areas. Our aim was to find out whether assessment of recreational pressure on forests from social interviews and GIS software is a good surrogate for determination and prediction of pine forest vegetation conditions without field studies. We hypothesized, that vegetation in forest tracts experiencing strong recreational pressure will differ from those experiencing lower recreational pressure in terms of species composition, vegetation vertical structure, and species strategy types. II. PROBLEM FORMULATION A. Description of territory The development of urban forests in the capital of Latvia – the city of Riga has a long history. Riga has been the owner of Fig.1 Riga city forest tracts: 1-Bulli, 2-Bolderaja, 3-Kleisti, forests since the thirteenth century and urban forests have 4-Imanta, 5-Mezaparks, 6-Vecdaugava, 7-Katlakalns, 8- always been accessible for inhabitants. After the Second Sampeteris, 9-Jaunciems, 10-Babelite, 11-Ulbroka, 12- World War, the urban forests in the inner city and green belt Smerlis, 13-Mangalsala, 14-Jugla, 15-Bikernieki. around the city were protected by the legislation of the Soviet period. According to Donis [20] 0.8% of all Latvian forests are B. Methods of vegetation research considered urban forests and 20% of urban areas covered by The research was carried out in Myrtillosa type pine forests, forests. Cities such as Riga tend to be set within and which constitutes the highest proportion (33%) of the surrounded by large tracts of forest, which expand beyond the prevailing forests on dry sites in Riga city [25], [27]. In each urban boundary [21]. forest tract during the vegetation season of 2011, 45 vegetation 2 Riga (the city area covers 304.05 km , there are 706.4 sample plots were arranged and surveyed (the area of each thousand inhabitants and the density of the population is sample plot - 400 m2). The age of pine is 80-94 years. The 2 2331.4 per 1 km ) is one of the biggest owners of forests in Braun-Blanquet method was used to describe the plant Europe: Riga municipality owns more than 55.600 ha of communities: the total projective coverage of tree (E3), shrub forests and in inner city there are 4243.7 ha of forests [22]. (E2), herb (E1) and moss (E0) layer as well as
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