AmeriDendro 2013 registration is open: follow the link on the Overview page.
13-17 May 2013
Tucson, Arizona
US/Arizona timezone
Home > Timetable > Session details > Contribution details
PDF | XML | iCal

Climate, fire, and demography central Oregon 1560-1900 AD

Presented by Dr. Donald FALK on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Board #: 14


Documenting historical fire regimes provides an unparalleled view of ecosystem function across spatiotemporal scales. We analyzed fire-scars and tree demography in a multiscale dendrochronological study from a network of sites in central and eastern Oregon. We sampled over 6000 trees for tree-establishment dates in ponderosa pine, dry and mesic mixed conifer, and lodgepole-ponderosa pine communities. Fire history was based on 12 new collections and 7 existing records. Fire-scar chronologies indicate 22 years in the period 1560-1900 with more than 10 sites recording fire, representing regionally widespread fire years on average every 16 years. Demography analysis revealed complex patterns of mixed-severity fire as expressed in tree regeneration patterns. Regional fire years occurred primarily in years of negative PDSI and above-average spring-summer temperature, whereas local and non-fire years were not different from mean conditions for the period of record, indicating a contingent relationship of seasonal climate to the extent of regional fire years.


Location: DoubleTree
Room: Salon E

Primary authors