(Table1.gif, 70KB / Table1.pdf, 181KB)
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Table 1. 210Pb dates for Little Lake
short core. (Table1.gif, 70KB / Table1.pdf, 181KB) |
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Table 2. Calibrated and uncalibrated 14C
dates used in the age models for Little Lake Core 93 and Core 91. (Table2.gif, 51KB / Table2.pdf, 164KB) |
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Figure 2. Age-versus-depth relations for core 93 based on the age model information given in Table 2. Model A was applied from 0.00 to 8.98 m depth, and model B was used for 8.98 to 11.33 m depth. Error bars are 2 SDs of the calibrated 14C years. |
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Figure 3. Log-transformed charcoal (CHAR) and magnetic susceptibility accumulation rates plotted against age in the short core. Core intervals with a plus sign are associated with known or suspected watershed fires in 1982, 1967, 1934, and 1910. |
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Figure 4. Comparison of untransformed and log-transformed Charcoal (CHAR) and magnetic-susceptibility accumulation rates plotted against age in core 93. Charcoal peaks assumed to be local fire events in the last 1500 years are marked (+) (see text for discussion). Values are not interpolated to a constant time step. |
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Figure 5. Comparison of window widths of 300, 600 and 900 years in defining background levels of log-transformed CHAR. Values interpolated to a constant time step. The intermediate width of 600 years was used for the fire history reconstruction. |
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Figure 6. Comparison of threshold-ratio values of 1.00, 1.05, 1.12, and 1.20 in the detection of peaks in log-transformed CHAR using a background window width of 600 years. Peaks (+) indicate a fire event. The arrow indicates the ca. 1700-yr fire-free period discussed in the text. The threshold-ratio value of 1.12 was selected for the fire history reconstruction. |
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Figure 7. Log-transformed CHAR, background level, peaks, and inferred fire frequency for core 93, using a background window width of 600 years and a threshold-ratio value of 1.12. Horizontal lines denote boundaries between zone 3 (early Holocene ca. 9000 to 6850 calendar years BP), zone 2 (middle Holocene ca. 6850 to 2750 calendar years BP), and zone 1 (late Holocene ca. 2750 calendar years BP to present). |
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Figure 8. Log-transformed magnetic-susceptibility accumulation rates, background level, peaks, and inferred sedimentation event frequency for core 93, using a background window width of 600 years and a threshold-ratio value of 1.12. |
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Figure 9. Inferred fire frequency from core 93 and pollen percentages of selected taxa from core 91 (Worona and Whitlock 1995). Black profile of Quercus and Picea is a 5% exaggeration. Taxa are grouped as fire/disturbance-adapted taxa or fire-sensitive after Agee (1993). Horizontal lines denote boundaries of charcoal-based zones. |