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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Shrub > Species: Vaccinium angustifolium | Low Sweet Blueberry
 

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FIRE CASE STUDIES

SPECIES: Vaccinium angustifolium | Low Sweet Blueberry
CASE NAME : Minnesota burn pruning, low sweet blueberry REFERENCE : Shubat, D. J. 1983 [132] SEASON/SEVERITY CLASSIFICATION : May/not reported. STUDY LOCATION : Sites are located along Highway 1 in northeastern Minnesota, south of the Ely Airport, and 2 miles north of Silver Bay on Lake Superior. Specific locations are as follows: (1) Palisades Site: located 2.5 miles (4 km) northeast of Silver Bay on Highway 61. (SW 1/4 Sec 22, T56N, R7W). (2) Isabella Tracks: cleared area north of Ely on Highway 1, approximately 0.5 mile (0.8 km) west of Forest Service Headquarters at Isabella, Minnesota. (NE 1/4, SE 1/4, Sec 1, T59N, R9W). (3) Isabella Sawbill: 12 miles (19 km) east of Isabella, Minnesota, just west of Sawbill Landing (NE 1/4 Sec 1, T60N, R8W). (4) Ely North: 2 miles (3 km) south of Ely Airport on Highway 120 and Highway 1 (W 1/2, NE 1/4, SW 1/4, Sec 35, T62N, R12W). (5) Ely South: located near Ely, Minnesota (SW 1/4, NW 1/4, NW 1/4, Sec 11, T61N, R12W). PREFIRE VEGETATIVE COMMUNITY : The preburn vegetative community consisted of pure open stands of low sweet blueberry (Vaccinium angustifolium), or stands made up of both low sweet blueberry and velvetleaf blueberry (V. myrtilloides). (1) Palisade Site: Low sweet blueberry plants were short and "stunted." (2) Isabella Tracks: Velvetleaf blueberry was the primary lowbush blueberry at this site. (3) Isabella Sawbill: This stand was made up of young, vigorous low sweet blueberry plants. (4) Ely North: Many weedy species were intermixed with low sweet blueberry. (5) Ely South: This stand exhibited few weedy plants. The soil surface was cover with decomposing branches and small logs. Low sweet blueberry plants were described as vigorous. TARGET SPECIES PHENOLOGICAL STATE : not reported SITE DESCRIPTION : Paired plots, burned and unburned, were located at four of the location. The fifth site (Palisade) had only the unburned plot. All plots were on level ground in full sun. Soils were as follows: P IT IS EN ES a b a b a b a b pH 4.5 5.3 5.3 5.3 5.4 5.0 5.4 5.0 4.1 organic matter high low low low med. low low low med. nitrogen low low low low low low low low low texture loam loamy sandy loamy loamy loamy sand loamy sand sand loam sand sand sand sand a unburned plot P Palisade site IS Isabella Sawbill site b burn plot ES Ely South site IT Isabella Tracks site EN Ely North site FIRE DESCRIPTION : Palisades Site - not burned. Isabella Tracks - mechanically pruned and burn-pruned plots. Isabella Sawbill - mechanically pruned and burn-pruned plots. Ely North - mechanically pruned and burn-pruned plots. Ely South - mechanically pruned and burn-pruned plots. Dried straw was spread across the burn-pruned plots prior to ignition. FIRE EFFECTS ON TARGET SPECIES : stems/ flower buds/ stem length stand 0.1 m sq. plant (cm) age (yrs) Isabella Tracks- unburned 2.3 6 22 3 burned 2 8 24 3 Isabella Sawbill unburned 3 2.3 22 2.6 burned 5 2.4 22 2 Ely North unburned 2 2 23 4 burned 2.3 1 23 4 Ely South unburned 3 11.6 35 4 burned 2 5.5 25 5 FIRE MANAGEMENT IMPLICATIONS : Both burning and mechanical pruning increased stem numbers. However, mechanically pruned plants produced more flower buds than the burn-pruned plants. Tests indicated that mulch should not be applied to recently pruned plants. Fertilizers proved to be most effective on mechanically pruned and untreated plants. They had little effect on recently burned plants. Best results were observed when plants were mechicanically clipped or fire pruned in April or November. This experiment suggests that semicultivated stands of low sweet blueberry in Minnesota may need to be pruned every 4 to 5 years rather than every other year as is most common in parts of the Northeast.

Related categories for Species: Vaccinium angustifolium | Low Sweet Blueberry

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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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