Abstract
In a Typha-dominated fresh water marsh, plant species composition was strongly influenced by the thickness of the floating organic mat. The "infilling" process was negatively correlated with pH (−0.63) and positively correlated (0.85 and 0.80) with the mat thickness and water table depth, respectively. The phytosociological tabulation of species cover data and the canonical correlation analysis of 14 environmental and plant variables arranged the 48 sampling quadrats into four groups, reflecting the seral stages towards the initial conditions of relatively stable fen formation. The buildup of undecomposed organic matter seems to be the driving force for the acidification, which is further intensified by the presence of Sphagnum and other bog-forming species.
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