Abstract
We used the closed chamber method to measure soil CO2efflux over a three‐year period at the Horseshoe Lake tree kill (HLTK)—the largest tree kill on Mammoth Mountain in central eastern California. Efflux contour maps show a significant decline in the areas and rates of CO2emission from 1995 to 1997. The emission rate fell from 350 t d−1(metric tons per day) in 1995 to 130 t d−1in 1997. The trend suggests a return to background soil CO2efflux levels by early to mid 1999 and may reflect exhaustion of CO2in a deep reservoir of accumulated gas and/or mechanical closure or sealing of fault conduits transmitting gas to the surface. However, emissions rose to 220 t d−1on 23 September 1997 at the onset of a degassing event that lasted until 5 December 1997. Recent reservoir recharge and/or extension‐enhanced gas flow may have caused the degassing event.
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