Adam Zydroń, Łukasz Bober
Uniwersytet Przyrodniczy, Poznań

The aim of the study was to develop the spatial concept of afforestation for the area of the Tarnowo Podgórne commune on the basis of guidelines concerning design of new forest complexes contained in the National Programme for Afforestation, the Programme for Afforestation of the Poznań Commune and Guidelines concerning the determination of the agricultural use-forest use boundary. Moreover, the aim of the study was to compare area developed according to the concept with the afforestation area resulting from the Study for the conditions and directions of spatial management and the Programme for Afforestation of the Poznań Commune. The subject matter of the study comprised identification of environmental trends in the Tarnowo Podgórne commune, based on which the afforestation arrangement was developed. The spatial scope of the study covered the administrative area of the Tarnowo Podgórne commune, taking into consideration forest complexes found in the neighbouring communes, lying directly at the boundary of the study area. The study used source materials collected from the Department of Spatial Management of the Tarnowo Podgórne commune and the Regional Directorate of the State Forests in Poznań. For the purpose of the analyses of the study area, resulting in the development of the afforestation concept together with its detailed analysis, a GIS system was created using the ArcGIS programme, incorporating information collected from different sources and concerning the Tarnowo Podgórne commune. Individual information layers in the GIS database facilitated analysis of the source materials: the Study of Conditions and Directions for Spatial Management of the commune in the 1:25 000 scale and the Programme for Afforestation in the Poznań county in the 1:50000 scale. Based on the analysis of a soil map, a map of nature value, a map of water conditions and a map of the cultural environment in the 1:10000 scale, constituting an element in the eco-physiographic study of the area from 2004, obtained from the Office of the Tarnowo Podgórne commune the value of animate nature, hydrographic conditions, soil conditions and selected anthropogenic conditions of the commune were determined, the latter being the most significant for the development of the afforestation concept. Based on the collected GIS information concerning the commune layers of areas recommended for afforestation were isolated in view of general principles and ecological and functional conditions required of the planned afforestation, contained in the Guidelines concerning the establishment of the boundary between the agricultural and forest use from 2003, such as afforestation of forest land and farmland of classes V and VI, afforestation of wasteland, afforestation of water course margins, water reservoirs, watersheds, protection zones for underground water intakes, afforestation forming ecological corridors and afforestation of buffer zones. The developed afforestation concept was analysed in the spatial aspect according to calculations performed in the Excell programme based on values collected from the GIS data base of the prepared project. Analysis of area calculation results made it possible to specify the percentage shares of individual afforestation areas following the guidelines as well as percentage changes in the forest cover of the Tarnowo Podgórne commune, which would be observed as a result of implementation of the developed concept. Based on the analyses the following conclusions were formulated: The final result of the developed concept comprised the design of a spatial afforestation system: of 2324 ha in area, which accounts for approx. 22.9% commune area and together with the existing afforestation areas it increases the forest cover share from 7.8% to 30.7%. which is bigger in area from the concept proposed in SUiKZP and PZLPP by approx. 1400 ha in accordance with the spatial requirements resulting from the allocation to the metropolitan zone, i.e. the trend of a dynamic increase in the urbanization level and an increase in the number of production plants and service workshops taking into consideration the area required for agricultural production. Under present-day socio-economic conditions the developed afforestation concept may not be realised due to the allocation of land to more profitable purposes (building development, industrial purposes …) in relation to the forest land use. The designed afforestation concept was developed in view of the source materials in an approximate 1: 10 000 scale and for this reason it may be used when preparing spatial management plans. Results of the design project need to include socio-economic criteria.

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