Abstract
Boreal forest fire and vegetation history was examined using an 840-yr fossil pollen and charcoal record from a site dominated by Picea glauca in Alberta, Canada. The record was created using contiguous 5-yr samples of annually laminated sediments from a 2.7-ha lake (Rainbow Lake A in Wood Buffalo National Park). Following a peak in the microscopic charcoal accumulation rate (CHAR), there is a sequence of peaks in sediment thickness and in 14 of the 21 common pollen and spore taxa. The general pollen sequence is an initial peak in herbs, then shrubs, then deciduous trees, and finally conifers and Sphagnum. The peak value for each taxon differs following individual fires, suggesting that a site does not undergo the same postfire vegetation sequence following all fires. Based on the CHAR, pollen, and sediment thickness records, at least 12 large, local fires are apparent. The average time interval between the 12 fires is 69 yr. Significant periodicities in CHAR and in 11 of the pollen taxa range between 95 ...
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