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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Shrub > SPECIES: Ceanothus greggii | Desert Ceanothus
 

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FIRE CASE STUDY

SPECIES: Ceanothus greggii | Desert Ceanothus

CASE NAME:


Arizona chaparral burn

REFERENCE:


Pase, C. P.; Lindenmuth, A. W. 1971 [93]

FIRE CASE STUDY AUTHORSHIP:


Zouhar, Kris. 2001.

SEASON/SEVERITY CLASSIFICATION:


fall/variable

STUDY LOCATION:


The study was located in the Sierra Ancha Experimental Forest in central Arizona, near the community of Globe.

PREFIRE VEGETATIVE COMMUNITY:


Prefire vegetation was dominated by shrub live oak (Quercus turbinella) and true mountain -mahogany (Cercocarpus montanus). Other important species included: Wright silktassel (Garrya wrightii), pointleaf manzanita (Arctostaphylos pungens), Pringle manzanita (A. pringlei), desert ceanothus (Ceanothus greggii), banana yucca (Yucca baccata), narrowleaf yerba santa (Eriodictyon angustifolium), and Wright buckwheat (Eriogonum wrightii). Many plants were decadent, and some dead before the site was burned.

TARGET SPECIES PHENOLOGICAL STATE:


Not reported

SITE DESCRIPTION:


Elevation: 5,300 feet (1615 m)
Annual precipitation: 25.0 inches (640 mm), 30% received June through September
Soils: coarse, poorly developed
Parent material: weathered diabase
Average slope length: 120 to 190 feet (37-58 m), few > 200 feet (61 m)
Slope steepness: moderate, averaging 30%

FIRE DESCRIPTION:


Burns were conducted in the fall (late September/early October) one time in each of four consecutive years [93].  Average weather and fuel conditions during burns were [67,93]:

  September 1961 September 1962 September-October 1963 October 1964
drought index  75 91 82 79
rate of spread index  15-20 10-20 10 10
maximum air temperature (oF) 69 85 80 79
relative humidity (%) 46 34 25 33
wind speed (mph) 17 5 6 5
litter moisture (%) 13 8 6 7

FIRE EFFECTS ON TARGET SPECIES:


Canopy cover of desert ceanothus was initially greatly reduced after the fires. Comparative cover values (% crown cover) by year are as follows [93]:

pretreatment post-treatment year 1 year 2 year 3 year 4 year 5
2.6 0.1 0.1 0.3 0.1 0.2 0.2

Numerous desert ceanothus seedlings emerged following fire, with 79% emerging the 1st postfire year.
Seedling emergence was as follows:

Postfire year seedlings per acre
1 1,481
2 309
3 413
4 445
5 317

FIRE MANAGEMENT IMPLICATIONS:


Plants are killed by fire. Heat stimulates germination of large numbers of stored seed. Prescribed fire can enhance the browse quality of decadent ceanothus stands, as numerous seedlings emerge after fire.


Related categories for SPECIES: Ceanothus greggii | Desert Ceanothus

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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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