Restoration of oak forest: effects of former arable use on soil chemistry and herb layer vegetation Running title: Effects of former arable use in oak forests KARIN VALTINAT 1 , HANS HENRIK BRUUN 1 and JÖRG BRUNET 2,* 1 Department of Ecology, Plant Ecology and Systematics, Lund University, Ecology Building, 223 62 Lund, Sweden; 2 Southern Swedish Forest Research Centre, Swedish University of Agricultural Sciences, P.O. Box 49, SE-230 53 Alnarp, Sweden *Author for correspondence (email: Jorg.Brunet@ess.slu.se; fax: +46-40-462325; phone: +46-40-415184)