Establishment of helophytes in the course of fen restoration

Abstract

In two fen areas of northeastern Germany, different techniques of re-introduction to establish reed-bed species in formerly intensively used, species-poor, grasslands, after rewetting, were studied under three hydrological regimes (permanent inundation, temporary inundation, border irriga- tion) with the aims (1) to establish peat-forming vegetation and (2) to enhance species richness. Establishment was successful for nearly all species inves- tigated under all hydrological variants. There were differences between individuals sown and those which had been planted. Wet, but not inundated soil linked with vegetation gaps create 'safe sites' which enable successful germination and seedling establishment. The survival rate for both planted and sown individuals was generally high, with the exception of Cladium mariscus, Eupatorium cannabinum and Phragmites australis Recommendations for restoration management include the establishment of the following successful species: Carex acutiformis, C. elata and C. paniculata to establish peat- forming vegetation; Iris pseudacorus, Lysimachia vulgaris, Lythrum salicaria to enhance species richness.