The collection of evidence indicates a fire regime predominantly characterized by moderate to high frequency, low- and mixed-severity fires that occurred in late summer to fall, with fires occurring in drier than average years that were often preceded by two to three years of wetter than average conditions. Lawson) ecosystems in Colorado, USA: fire frequency, severity, extent, seasonality, and climate. I performed a systematic review of the literature and meta-analysis of the derived data from 26 publications to characterize five parameters of the historical fire regime of ponderosa pine ( Pinus ponderosa Lawson & C. In many western North American forests, the keystone disturbance is fire, and a plethora of research exists characterizing various fire regime parameters, although often only one or two parameters are addressed in individual studies. Consequently, we conducted this study during the summer of 1999 to examine the historic and climatic fac-tors influencing the grassland-woodland fires at Aiken Canyon and to support management decisions.įorest management, especially restoration, is informed by understanding the dominant natural disturbance regime. The Nature Conservancy considered controlled burns as a restoration method at Aiken Canyon, but such manage-ment requires knowledge of past fire distur-bance patterns in terms of their timing, sever-ity, and spatial distribution. Baker (1992) recommended managing nature preserves based on landscape-scale processes rather than for individual species or particular communi-ties, noting that ecotones are worth preserving in their own right. Disturbances such as fire alter landscapes, encouraging species di-versity and spatial heterogeneity. The Nature Conservancy dedicated the Aik-en Canyon Preserve in 1994 and soon became concerned about the loss of grassland to wood-land within this ecotone. Después de 1935, la supresió n del fuego llegó a ser comú n. Fuegos de los ferrocarriles o de ranchos de ganado pudieron haber causado el MIF corto en los prados entre 1872 y 1935. Un MIF más corto se observó en los prados que están en elevaciones más bajas. Se encontró una asociación significativa entre patrones de tiempo de El Niño y fuegos en el Aiken Canyon.
Un medio excepcionalmente pequeño del intervalo de fuego (MIF) de 7.5 años se obtuvo por el período de 1753 a 1935. Dieciocho secciones cortadas de Pinus ponderosa registraron 20 acontecimien-tos de fuego en el período de 1602 a 1999. RESUMEN Se presenta la historia de fuegos en la reserva de la Aiken Canyon Nature Conser-vancy en Colorado. After 1935, fire suppression became common. Fires from railroads or cattle ranching might have caused the shorter MFI in the grass-lands between 18. A shorter MFI was observed in the grasslands, which are at lower elevations.
A significant association was found between El Nino weather patterns and the fires at Aiken Canyon. An unusually small median fire interval (MFI) of 7.5 years was obtained for the period 1753 to 1935. Eighteen cross-sections cut from ponderosa pine recorded 20 fire events for the period spanning 1602 to 1999. A fire history for the Aiken Canyon Nature Conservancy preserve in Colorado is presented.
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