Department of Physics, Chemistry and Biology (IFM)

I am very grateful to my supervisors Per Milberg and Heidi Paltto for all the help, guidance and good advice offered during this project. I want to thank Karl-Olof Bergman and Lars Westerberg for valuable comments and suggestions. A special thanks to Petter Näslund who helped during the field work in Bråbo. A huge thanks to those involved in initiating, maintaining and monitoring the long-term field trials analysed here and especially to Håkan Fogelfors and Roger Svensson who answered all my questions. This study was supported by Stiftelsen Oscar och Lili Lamms minne.