Abstract
Small-scale, short-term cycles constitute an important aspect of vegetation dynamics. It has been widely accepted that such cycles are characteristic of unmanaged heath communities where the dominant, Calluna vulgaris, undergoes an age-related series of changes in its growth and morphology. This is thought to give rise to a repetitive sequence of changes in the occupancy of gaps which form in the Calluna canopy and are first colonized by other species, with Calluna re-establishing later. Recently, doubts have been cast as to whether the changes are in fact often repetitive. A new study has shown much greater variability than was previously suspected in the transitions occurring in gaps. There is evidence that, in some instances though by no means all, Calluna can re-establish and thereby initiate a genuine cycle. It seems, however, that such re-entry is seldom by means of seedling establishment, but more frequently by development of adventitious shoots and roots on stems which have come to lie across the gap and have been covered by moss, moist litter or humus.
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Barclay-Estrup P. 1970. The description and interpretation of cyclical processes in a heath community. II. Changes in biomass and shoot production during the Calluna cycle. J. Ecol. 58: 243–249.
Barclay-Estrup P. 1971. The description and interpretation of cyclical processes in a heath community. III. Microclimate in relation to the Calluna cycle. J. Ecol. 59: 143–166.
Barclay-Estrup P. & Gimingham C. H. 1969. The description and interpretation of cyclical processes in a heath community. I. Vegetational change in relation to the Calluna cycle. J. Ecol. 57: 737–758.
Gong Wooi Khoon & Gimingham C. H. 1984. Birch regeneration in heath vegetation. Proc. Roy. Soc. Edinb. 85B: 73–81.
de Hullu E. & Gimingham C. H. 1984. Germination and establishment of seedlings in different phases of the Calluna life cycle in a Scottish heathland. Vegetatio 58: 115–121.
Marrs R. H. 1986. The role of catastrophic death of Calluna in heathland communities. Vegetatio 66: 109–115.
Miles J. 1981. Problems in heathland and grassland dynamics. Vegetatio 46: 61–74.
Prentice I. C., van Tongeren O. & de Smidt J. T. 1987. Simulation of heathland vegetation dynamics. J. Ecol. 75: 203–219.
van Tongeren O. & Prentice I. C. 1986. A spatial simulation model for vegetation dynamics. Vegetatio 65: 163–173.
Watt A. S. 1947. Pattern and process in the plant community. J. Ecol. 35: 1–22.
Watt A. S. 1955. Bracken versus heather, a study in plant sociology. J. Ecol. 43: 490–506.
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Gimingham, C.H. A reappraisal of cyclical processes in Calluna heath. Vegetatio 77, 61–64 (1988). https://doi.org/10.1007/BF00045751
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DOI: https://doi.org/10.1007/BF00045751