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Table2.gif, 36K / Table2.pdf, 41K
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Postglacial Vegetation and Fire History, Eastern Klamath Mountains,
California, USA.
Jerry A. Mohr, Cathy Whitlock, and Carl N. Skinner (2000).
The Holocene 10(4): 587-601.
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Figure 1. Map showing the location of Bluff Lake, Crater Lake and other sites discussed in text. |
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Table 1. Modern vegetation zones, eastern
subregion Klamath Mountains, California.
Table1.gif, 57K / Table1.pdf, 36K |
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Figure 2. (A) Age-versus-depth curve for Bluff Lake short core based on a series of 210Pb dates. Dates were provided by Battelle Marine Sciences Laboratory, Sequim, Washington. (B) Age (calendar year BP)-versus-depth curve for Bluff Lake. (C) Age (calendar year BP)-versus-depth curve for Crater Lake. Uncalibrated 14C dates are plotted by depth. |
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Table 2. Uncalibrated radiocarbon dates and
calibrated ages from Bluff Lake and Crater Lake.
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Figure 3. Charcoal concentration and accumulation rates before (A, B and C) and after decomposition (D and E) for Bluff and Crater Lakes. (A) Concentration of raw charcoal counts plotted by depth. (B) Concentrations of raw charcoal counts plotted by age (cal. BP). (C) Charcoal accumulation rates (CHARs) calculated from raw charcoal concentration data. (D) Accumulation rates calculated using decomposition method of Long et al. 1998 (see discussion). (E) Decomposed accumulation rates plotted on a log 10 scale. (Note: dashed line in the Bluff Lake record was segment in core not included in analysis.) |
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Figure 4. Lithology, magnetic susceptibility concentrations, organic content, deposition time and ucalibrated 14C dates for Bluff Lake and Crater Lake. Shaded area on Bluff Lake Graph shows segment of core where one or more rapid sedimentological events occurred. |
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Figure 5. Charcoal concentration and CHAR (charcoal accumulation rate) for Bluff Lake for the last 200 years (solid lines). Raw data were decomposed into background component (dashed line) using the same parameters as the long record. Bars indicate fire-event intervals inferred by values above background. Numbers in ( ) are years of fire identified from dendrochronologic data. |
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Figure 6. CHAR record for the last 15,300 years at Bluff Lake and CHAR record for the last 8400 years at Crater Lake. Accumulation rates were decomposed into background (also shown) and peaks (see text for discussion). Dashed line in the Bluff Lake graph represents a period of rapid sediment accumulation that was not included in the decomposition analysis. The event-frequency curves show the number of peaks per 1000 years. |
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Figure 7. Fire-event frequency and pollen-percentage diagram of selected taxa for Bluff Lake. Shaded area represents exaggeration of 5x. Fire events span 24 to 180 years. |
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Figure 8. Fire-event frequency and pollen-percentage diagram of selected taxa for Crater Lake. Shaded area represents exaggeration of 5x. Fire events span 12 to 120 years. |
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Figure 9. Fire-event frequency for Bluff Lake and Crater Lake showing trends for the last 9000 cal. BP. |
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Figure 10. Summary of the postglacial
vegetational history for selected sites in California and Oregon.
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