Grateful Dead

or reviewed some of the papers in this work, among others: Luc Christiaensen, Danielle De Lame, Lee Ann Fujii, Peter Goos, Catharine Newbury, Elisabeth Levy Paluck, Anja Struyf. Their comments and inputs helped and encouraged me. I am especially grateful to Ann Verdoodt and the team surrounding her for providing the soil quality data that are used in chapter 4. Special thanks go out to my parents Chris and Ronny, and my sister Tine. They have never stopped believing in me, even when I did not