A locally variable term of Scandinavian origin, used to describe forested, wet, rheotrophic habitats, usually with some peat development but with neutral (not extremely acid) waters and good nutrient status. In East Anglia, England, they are typically alder woods (Alnus glutinosa), but where nutrient levels are less favourable willow (Salix species), especially S. cinerea (grey willow), may be the principal tree species. See also fen. Compare bog.
Subjects: Plant Sciences and Forestry — Ecology and Conservation.