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Figure 6 - This figure illustrates the complex response associated with changes in climate, vegetation, fire regimes, and erosional response over Holocene timescales in the Middle Fork Salmon River (MFSR). Graph of 49 radiocarbon dated deposits and represents the total reconstructed fire record for the Middle Fork Salmon River. The x-axis is calibrated years BP moving forward in time from left to right with 0 cal yr BP being 1950 AD. The data in the inverted bar graph represents the sample count of the number of dated charcoal fragments creating the above smoothed curves. Red bars are lower basin samples and blue bars are upper basin samples. Curves are the cumulative sum of 14C age distributions and are not normalized. The black curve is a 100-yr running mean and represents all dated fires (n=49) collected from within all deposits types (i.e., debris flows, burn surfaces, hyper-concentrated flows, sheetfloods, and over-bank deposits). The fire record is deconstructed into data subsets highlighting spatial distribution of fires and the type of deposition process delivering sediment over time. The subset curves (not smoothed) represent dated upper basin and lower basin subsets confidently identified as debris flow deposits or sheetflood deposits. Two regional climate proxies are compared to the MFSR fire record.

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Uploaded: Oct31 11

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Kerry Riley
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