Long-Term Forest Fire Ecology and Dynamics in Southern Switzerland

1 Pollen and charcoal analysis at two lakes in southern Switzerland revealed that fire has had a prominent role in changing the woodland composition of this area for more than 7000 years. 2 The sediment of Lago di Origlio for the period between 5100 and 3100 BC cal. was sampled continuously with a t...

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Bibliographic Details
Published in:The Journal of ecology 1999-04, Vol.87 (2), p.273-289
Main Authors: Tinner, Willy, Hubschmid, Priska, Wehrli, Michael, Ammann, Brigitta, Conedera, Marco
Format: Article
Language:English
Subjects:
Abies alba
Charcoal
charcoal analysis
Ecology
Fire ecology
fire history
Forest & brush fires
Forest ecology
Forest fires
Forests
Human ecology
Plants
Pollen
pollen analysis
Sediments
southern Alps
Taxa
Vegetation
vegetation history
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Summary:1 Pollen and charcoal analysis at two lakes in southern Switzerland revealed that fire has had a prominent role in changing the woodland composition of this area for more than 7000 years. 2 The sediment of Lago di Origlio for the period between 5100 and 3100 BC cal. was sampled continuously with a time interval of about 10 years. Peaks of charcoal particles were significantly correlated with repeated declines in pollen of Abies, Hedera, Tilia, Ulmus, Fraxinus excelsior t., Fagus and Vitis and with increases in Alnus glutinosa t., shrubs (e.g. Corylus, Salix and Sambucus nigra t.) and several herbaceous species. The final disappearance of the lowland Abies alba stands at around 3150 BC cal. may be an example of a fire-caused local extinction of a fire-intolerant species. 3 Forest fires tended to diminish pollen diversity. The charcoal peaks were preceded by pollen types indicating human activity. Charcoal minima occurred during periods of cold humid climate, when fire susceptibility would be reduced. 4 An increase of forest fires at about 2100 BC cal. severely reduced the remaining fire-sensitive plants: the mixed-oak forest was replaced by a fire-tolerant alder-oak forest. The very strong increase of charcoal influx, and the marked presence of anthropogenic indicators, point to principally anthropogenic causes. 5 We suggest that without anthropogenic disturbances Abies alba would still form lowland forests together with various deciduous broadleaved tree taxa.
ISSN:0022-0477
1365-2745
DOI:10.1046/j.1365-2745.1999.00346.x