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Wildlife, Animals, and Plants |
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FIRE CASE STUDIES
CASE NAME:Lyle Canyon REFERENCE: Bock, J. H.; Bock, C. E. 1987 [17]
SEASON/SEVERITY CLASSIFICATION:Spring burn. Conducted on May 25th, 1984. Severity was not specified. Four of five plots recorded fireline intensities of 8 to 58 kW/m. Fireline intensity at the first plot was 260 kW/m.
STUDY LOCATION:Lyle Canyon in southeastern Arizona. The canyon is located in the foothills on the west side of the Huachuaca Mountains.
PREFIRE VEGETATIVE COMMUNITY:The preburn community was an evergreen oak woodland. Dominant grasses included sideoats grama (Bouteloua curtipendula), plains lovegrass (Eragrostis intermedia), Texas beardgrass (Andropogon cirratus), and Hall's panicgrass (Panicum hallii). Common herbs were goldeneye (Viguiera annua), spreading snakeweed (Dyschoriste decumbens), and Louisiana sagewort (Artemisia ludoviciana). Wait-a-minute bush (Mimosa biuncifera), velvet-pod (Mimosa dysocarpa), and yerba de pasmo (Baccharis pteronioides) were common shrubs. Emory oak (Quercus emoryi) and Arizona white oak (Q. arizonica) were dominant tree species. A few alligator junipers (Juniperus deppeana) were present.
TARGET SPECIES PHENOLOGICAL STATE:Not reported. Burn was conducted "prior to the growing season."
SITE DESCRIPTION:Elevation - approximately 4,921 feet (1,500 m) Mean January minimum temperature - 29 degrees Fahrenheit (-1.75oC) Mean June maximum temperature - 90 degrees Fahrenheit (32.4oC) Average annual precipitation - 17 inches (430 mm); 1/2 to 2/3rds between July and September
FIRE DESCRIPTION:The fire occurred on May 25th from 10 AM to noon under hot, dry, calm conditions: Air temperature - 90 to 92 degrees Fahrenheit (32-33oC) Relative humidity - 16 to 18% Winds - variable; gusts of 5 to 10 mph (8-16 km/hour) Dead fuel moisture - 5 to 6% (fine fuels)
FIRE EFFECTS ON TARGET SPECIES:Number of alligator juniper trees per 60 m2 subplot on experimental vs. control plots (N = 50 subplots per treatment year) was:
Mean changes in density were:
FIRE MANAGEMENT IMPLICATIONS:Bare ground was significantly greater on burned plots in postfire years 1 and 2 (P = t(P) of 0.88 (NS), 6.79 (<0.001, and 2.58 (<0.02) respectively). There was little impact on woody plant densities, including alligator juniper.
Related categories for SPECIES: Juniperus deppeana | Alligator Juniper |
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