First I would like to thank my supervisors Professor Per Milberg and Dr Karl-Olof Bergman for all their support during this study. I would also like to thank PhD student Håkan Lättman for educating me in identifying difficult species. I would also like to thank the land owners Henric Falkenberg of Brokinds gods and the municipality of Linköping for letting me work on their land. And last but not least a large thanks to Stiftelsen Oscar och Lili Lamms Minne for the financial support to this study.