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| Title: | Ecological succession after burning in dry sclerophyll vegetation | | Year: | 1976 | | Author/s: | Rosemary W. Purdie | | Degree: | Doctorate | | University/Institution: | Australian National University | | Abstract: | "The dynamics of regeneration by vegetative regrowth and seed germination were examined during the first two years after the burning of three communities in dry sclerophyll forest near Canberra, A.C.T.
All species represented in the vegetation prior to burning, by either living plants and/or seeds in the soil and litter, were present in the regenerating communities in the first year after burning. No new species invaded the burnt areas.
All species were found to exhibit one of three modes of recovery: 23% regenerated by vegetative regrowth alone, 27% by seed germination alone, and the remainder by a combination of regrowth and germination. Both the recovery of preburn populations by vegetative growth and the net seedling input of species were greatest during the first year after burning.
Surviving vegetative organs generally commenced shoot growth within two to three months of burning. Both the initiation and subsequent development of regrowth were affected by environmental conditions (especially water availability), preburn plant age, origin of the regenerative bud, and fire-induced effects on plant growth. Negligible mortality of regrowth occurred.
Regeneration of the shrub and herbaceous species by seed germination was effected from seed reserves in the soil and litter, which escaped combustion and lethal heating during the fires. For the Eucalyptus species, seed released from the trees after burning provided the source for regenerative seedling populations.
Burning promoted the germination of most species through heat effects on the seeds and/or by removing the influence of factors which inhibited germination in the absence of fire.
Seedling mortality was highest during the first year after germination, and many seedlings died while still in the cotyledon stage. The most commonly observed causes of mortality were desiccation, fungal disease, and predation by insects
Seedling survival was enhanced by fire-induced changes in the environment, which promoted seedling establishment and growth. Such changes were thought to include the removal of inhibitory factors present in the unburnt condition, increased soil friability, and improved soil fertility.
The process of regeneration after burning was examined in relation to various theories of secondary succession. From the results of this study, and after a survey of the postburn regeneration in a number of different vegetation types subject to periodic burning, it was concluded that the recovery of such communities after disturbance by fire closely resembles an Initial Floristic Composition model. When a community is disturbed by agents other than fire, which impose different stress conditions on the species present and different constraints on the early stages of revegetation, the process of regeneration would not be expected to conform to the same model as that described for fire.
" | | Type: | Thesis |
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