Comparison of sedimentary microscopic charcoal particle records in a small lake with dendrochronological data: evidence for the local origin of microscopic charcoal produced by forest fires of low intensity in eastern Finland
| Autor: | Hannu Lehtonen, Pertti Huttunen, Aki Pitkänen |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Palynology
010506 paleontology Archeology Global and Planetary Change 010504 meteorology & atmospheric sciences Ecology Paleontology Sediment Vegetation 01 natural sciences Archaeology visual_art Spatial ecology visual_art.visual_art_medium Dendrochronology Environmental science Sedimentary rock Physical geography Charcoal Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | The Holocene. 9:559-567 |
| ISSN: | 1477-0911 0959-6836 |
| DOI: | 10.1191/095968399670319510 |
| Popis: | Dendrochronological data and microscopic charcoal particle series from annually laminated lake sediment covering the past 520 years were compared. Slash-and-burn cultivation had been practised in the area (63°109N, 30°589E) for about 300 years during this period, causing a considerable increase in the number of forest fires. The fire years based on fire-scar data coincided with peaks in the microscopic charcoal series, suggesting that a significant proportion of charcoal particles usually counted on pollen slides can originate from local fires or fires within a few kilometres of the sampling point. Thus, contrary to the theories of charcoal particle transport, the abundance of microscopic charcoal may indicate, in some cases, fires at close quarters better than at a regional or broader spatial scale. Regional sources contribute to the microscopic charcoal records, but an increase in the proportion of largest particles and a decrease in particle size c., 10 mmin diameter suggest local burning. The result may be due to fires of a low-intensity in the area. The particles collected during an experimental low-intensity burn supported the results obtained from the sediment samples. The majority of the particles collected were of the same sizes that are most abundant on pollen slides. |
| Databáze: | OpenAIRE |
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