Heyerdahl fire data from Imnaha - IMPD USIRC001 Heyerdahl, E.K.; Brubaker, L.B.; Agee, J.K. Heyerdahl, E.K. Brubaker, L.B. Agee, J.K. PIPO Pinus ponderosa Douglas ex C. Lawson ponderosa pine western yellow pine earth science/paleoclimate/fire history|tree ring (tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,FHX2 data format; refer to IMPD documentation for description of codes) earth science/paleoclimate/ (sample identification,null,null,null,null,,null,null,C,Tree ID) earth science/paleoclimate/fire history|tree ring (age,null,null,null,null,fire history|tree ring,null,null,N,null) earth science/paleoclimate/fire history|tree ring (tree demographic and injury and fire event code,wood,null,null,null,fire history|tree ring,null,null,C,null) earth science/paleoclimate/fire history earth science/paleoclimate/fire history (Imnaha>LATITUDE 45.12>LONGITUDE -116.98) Our objective was to infer the controls of spatial variation in historical fire regimes. We reconstructed a multicentury history of fire frequency, size, season, and severity from fire scars and establishment dates of 1426 trees sampled on grids in four watersheds (-64 plots, over -1620 ha each) representative of the Blue Mountains, Oregon and Washington, USA. The influence of regional climate, a top-down control, was inferred from among-watershed variation in fire regimes, while the influence of local topography, a bottom-up control, was inferred from within-watershed variation. Before about 1900, fire regimes varied among and within watersheds, suggesting that both top-down and bottom-up controls were important. At the regional scale, dry forests (dominated by ponderosa pine), burned twice as frequently and earlier in the growing season in southern watersheds than in northern watersheds, consistent with longer and drier fire seasons to the south. Mesic forests (dominated by subalpine fir or grand fir) probably also burned more frequently to the south. At the local scale, fire frequency varied with different parameters of topography in watersheds with steep terrain, but not in the watershed with gentle terrain. Frequency varied with aspect in watersheds where topographic facets are separated by significant barriers to fire spread, but not in watersheds where such facets interfinger without fire barriers. Frequency varied with elevation where elevation and aspect interact to create gradients in snow-cover duration and also where steep talus interrupts fuel continuity. Frequency did not vary with slope within any watershed. The presence of both regional-scale and local-scale variation in the Blue Mountains suggests that top-down and bottom-up controls were both important and acted simultaneously to influence fire regimes in the past. However, an abrupt decline in fire frequency around 1900 was much greater than any regional or local variation in the previous several centuries and indicates that 20th-century fire regimes in these watersheds were dramatically affected by additional controls such as livestock grazing and fire suppression. Our results demonstrate the usefulness of examining spatial variation in historical fire regimes across scales as a means for inferring their controls. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Heyerdahl, E.K. Investigator : Brubaker, L.B. Investigator : Agee, J.K. 2001-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2231 https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/establishment/northamerica/usirc001.dat https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.png https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.fhx https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/usirc001-plot-information.csv https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/establishment/northamerica/usirc001.dat https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.png https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.fhx https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/usirc001-plot-information.csv English https://www.ncdc.noaa.gov/paleo/study/2231 https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.pdf https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/establishment/northamerica/usirc001.dat https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.txt https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/fire-hist-graphs/usirc001-fire-hist-graph.png https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usirc001.fhx https://www1.ncdc.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/supplemental/usirc001-plot-information.csv Heyerdahl, E.K., L.B. Brubaker, and J.K. Agee2001Spatial controls of historical fire regimes: a multiscale example from the Interior West, USAEcology82660-678 Heyerdahl, E.K.1997Spatial and temporal variation in historical fire regimes of the Blue Mountains, Oregon and Washington: the influence of climate. Ph.D. dissertation.Thesis Heyerdahl, E.K., L.B. Brubaker and J.K. Agee2002Annual and decadal climate forcing of historical fire regimes in the interior Pacific Northwest, USAThe Holocene12597-604 Heyerdahl, E.K. and S.J. McKay2001Condition of live, fire-scarred ponderosa pine trees, six years after removing partial cross sectionsTree-Ring Research57131-139 Heyerdahl, E.K. and S.J. McKay2008Condition of live, fire-scarred ponderosa pine eleven years after removing partial cross-sectionsTree-Ring Research6461-64 START YEAR: 1480 AD * END YEAR: 1994 AD -116.98 45.12 -116.98 45.12