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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Shrub > Species: Rhamnus purshiana | Cascara
 

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FIRE EFFECTS

SPECIES: Rhamnus purshiana | Cascara
IMMEDIATE FIRE EFFECT ON PLANT : Cascara is usually top-killed by fire [29]. Preburn and postburn measurements of cascara in central Idaho were as follows [17]: Avg. Live Avg. Live Avg. Crown Avg. Dead No. Avg. Sprout Crown Diameter Crown Height Below 7ft. Crown Basal Height (ft) (ft) (%) (%) Sprouts (ft) ------------------------------------------------------------------------------ Preburn 4.0 8.0 95.0 95.0 1.0 1.5 Postburn 3.0 4.5 100.0 100.0 18.0 3.0 ------------------------------------------------------------------------------ 1. Preburn measurements were taken in March, 1965. Postburn measurements were taken in August, 1965. 2. Postburn measurements were taken on the part of the plant which existed before treatment. 3. All cascara's aboveground parts were completely killed by the fire. DISCUSSION AND QUALIFICATION OF FIRE EFFECT : NO-ENTRY PLANT RESPONSE TO FIRE : Change in cascara measurements after prescribed burns in northern Idaho were as follows [16]: 1965 1970 1975 1966 1971 1976 ------------------------------------------- Avg. Preburn Crown Height (cm): 244 --- --- --- --- --- Avg. Preburn Crown Diameters (cm): 91 --- --- --- --- --- Avg. No. Basal Sprouts per Plant: 18 12 7 --- --- --- Avg. Sprout Height (cm): 91 76 76 --- --- --- Max. Crown Height 2 Years After Burn (cm): --- --- --- 183 137 122 Max. Crown Diameter 2 Years After Burn (cm): --- --- --- 137 107 107 DISCUSSION AND QUALIFICATION OF PLANT RESPONSE : NO-ENTRY FIRE MANAGEMENT CONSIDERATIONS : Fire intervals on southern Oregon sites where cascara occurs range from 30 to 60 years, to longer intervals of 100 to 320 years. These understories are generally free from heavy fuels, giving rise to low-intensity fires. In some plant associations that include cascara, however, high-intensity, stand-replacing fires occur approximately every 60 to 150 years [2].

Related categories for Species: Rhamnus purshiana | Cascara

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Information Courtesy: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Fire Effects Information System

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