The invasion of birch (Betula pubescens) in raised bogs is threatening the existence of the bogs in Northwest Europe. For the conservation of raised bogs knowledge is needed on the conditions which favor establishment and growth of birches on raised bogs.
- Theunissen, M. (2008). What makes birches grow? Relating environmental factors to the radial growth of birch in raised bogs. ( supervision: Sass-Klaassen, in cooperation with Limpens/NCP-WU)
- Barendse, S. (2007). Birches in bogs, when did they come there? – Birch germination in relation to climatological conditions. (supervision: Sass-Klaassen, in cooperation with Limpens/NCP)