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Triumf, Hanna (2008) Landskapsplanering och konnektivitetsförbättringar inom värdetrakter i Västerbottens län. Other thesis, SLU.

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Abstract

According to the Swedish strategy for forest protection, additionally 40 000 ha productive forestland will be protected in the county of Västerbotten, between 1999 and 2010. A national project was carried out to distinguish the proportion of forest with a high biological value, in all counties. The project resulted in demarcation of small landscape areas or small "biological value regions" (bvr), with higher concentrations of forests with conservation values and red listed species than the surroundings. In Västerbotten, 26 such bvr's were identified and the Counties Agency and Forest Agency in Västerbotten developed a regional strategy for forest conservation to standardize the forest protection process. The regional strategy state that forests with high biological conservation values should be prioritized for protection. An important biological conservation value is ecological functionality, and ability to contribute to a sufficient connectivity, among protected nature reserves at a landscape scale. Conservation planning on landscape level is essential for maintaining species diversity and protecting threatened species. The reduction of biologically important substrates, like dead wood and broadleaved trees, has made the surviving more complicated especially for species with poor abilities to spread for long distances. The aim of this thesis was to create a model for the working process of improving connectivity within the bvr's in the county of Västerbotten. A case study in the bvr Storbränntjärnmyran - Hålvattsmyran, situated 50 – 70 km from the city of Umeå, formed the resulting model. An analysis that examines the connectivity between existing nature reserves is presented and suggestions follows for how to improve the situation with further protection of forestland. An improved connectivity between high qualitative protected forest areas would increase the chances of survival for species with poor dispersal abilities. A connectivity analysis in every bvr should determine the distribution of new protection areas and bvr's with poor connectivity should be prioritized. Improvements can be initiated with analyses in the bvr, examining the present connectivity situation, followed by a process of active search for forests with biological conservation values, or forests with high potential to develop biological values, in areas with poor connectivity. However, in this process areas with high biological values should always be prioritized before areas with only a suitable emplacement in the landscape. Forest areas with high biological quality situated close to forest company reserves, state owned nature reserves or biologically important mires should be of high priority. The working process used in the case study combined utilizing kNN data with the software of Arc GIS and GIS analysis models were constructed to identify potentially biologically interesting areas. Areas identified with the GIS models were then examined in field during the autumn of 2007 in order to assess the biological conservation values. The field studies led to identification of result areas divided into priority classes based on the estimated quality of the biological values and the potential to enter to a functional (protected) unit. Protection of the result areas from the case study would improve the connectivity, compared to the present connectivity situation, which would imply an improved situation for species with poor spreading abilities within the bvr Storbränntjärnmyran - Hålvattsmyran.

Item Type: Thesis (Other)
Keywords: Landskapsplanering, värdetrakt, värdekärna, konnektivitet, GIS
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Dept. of Forest Ecology and Management
Divisions: SLU > Faculty of Forest Sciences
Depositing User: Ann-Kathrin Persson
Date Deposited: 28 Jan 2009
Last Modified: 18 Aug 2015 10:11
URI: http://ex-epsilon.slu.se/id/eprint/3047

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