Ecological Studies in the Breck Fens I. Vegetation in Relation to Habitat

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Abstract
Investigations of fens on 3 east anglian rivers have shown 2 main categories, nutrient-poor headwater fens at the sources of the streams (dominated by Cladium marisgus, Schoenus nigricans, etc. in wet parts) and nutrient-rich silted valley fens (dominated by Phragmites communis in wet parts). Alnus glutinosa is the principal tree dominant in both types- The differences between the two decreasing with decreasing water level. The vegetation is determined principally by water table, human interference, and differences in nutrient status, nutrient status being increased by silting, drying and disturbance.

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