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Wildlife, Animals, and Plants |
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FIRE CASE STUDIES
CASE NAME:Bottlebrush squirreltail postfire response in a ponderosa pine forest of Arizona
REFERENCE:Vose, J. M.; White, A. S. 1991 [199]
FIRE CASE STUDY AUTHORSHIP:Simonin, Kevin. 2001.
SEASON/SEVERITY CLASSIFICATION:This was a late October fire. The fire smoldered for several days and consumed the entire litter layer, with a total heat yield of 115,830 calories/foot2 (1600 kJ/m2).
STUDY LOCATION:The prescribed fire took place within open sawtimber sites, pole sites, and sapling sites within a ponderosa pine (Pinus ponderosa)/Arizona fescue (Festuca arizonica) habitat type.
PREFIRE VEGETATIVE COMMUNITY:
TARGET SPECIES PHENOLOGICAL STATE:No-entry
SITE DESCRIPTION:ponderosa pine/Arizona fescue habitat type
FIRE DESCRIPTION:The day of initiation, average temperature was between 57.2 and 64.4 degrees Fahrenheit (14-18 °C) and relative humidity was 21%.
FIRE EFFECTS ON TARGET SPECIES:Vegetative biomass within open saw timber sites, including surviving bottlebrush squirreltail plants and new seedlings, was approximately 3 times greater (P<0.05) on burn plots compared to control, 247 lbs (112 kg/ha) and 88 lbs (40 kg/ha) respectively. Surviving bottlebrush squirreltail plants within burned, open saw timber areas had more than twice the vegetative production. Seedling recruitment within open saw timber sites was also greater on burned than control plots. Burned open saw timber plots produced an average seedling biomass 15 times greater (p<0.05) than on control plots. Bottlebrush squirreltail in pole sites and sapling sites showed a more negative response to fire than in open sawtimber sites. Results for bottlebrush squirreltail are summarized below:
No significant phenological differences were found between all burned areas and control.
FIRE MANAGEMENT IMPLICATIONS:Overall response of bottlebrush squirreltail within pole and sapling stands was less than in open saw timber areas; however, the response of surviving plants in pole and sapling stands remained strong. Seedlings are generally more vulnerable to environmental changes than established plants. The postfire response of surviving bottlebrush squirreltail plants may result in an increased presence of bottlebrush squirreltail within later postfire stages.
Related categories for SPECIES: Elymus elymoides | Bottlebrush Squirreltail |
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