Studies in the Ecology of Wicken Fen: IV. Crop-Taking Experiments

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Abstract
Exptl. areas in calcareous fen (Wicken Fen, England), cut at intervals of 1, 2, 3 and 4 yrs. for a period of 12 yrs., have shown striking changes in vegetation composition. These have been followed by area-lists, quadrat mapping and dry wts. of sorted components of the crops. The yearly cropping in 12 yrs. turns Cladio-Molinietum (a community cut for thatch on the fen every 3-4 yrs.) into a community closely resembling Molinietum (a community cut for cattle-litter at yearly intervals). The change is slower, though similar in direction with longer intervals between crops. In some areas, with complete cessation of cropping reversal of these changes occurs. The long-lived character of the leaves of Cladium mariscus makes it susceptible to yearly cutting in contrast with Molinia coerulea which has annual shoots, and which extends rapidly under yearly (winter) cutting. The removal of the dominance of Cladium allows the abundant establishment of the dwarf light-demanding spp. which characterize the Molinietum. Evidence is given for strong seasonal variation in crop composition. The 3 methods of recording vegetational change have complementary advantages.

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