![]() Does anyone remember them? You might notice that Bonnie’s drawing is not as crisp as usual. The notes along with Bonnie’s drawing were the Obispoensis cover back in 1998. and then the spread of Sudden Oak Death (SOD) into our county. First, there was the clearing of valley ( Quercus lobata) and blue ( Q. douglasii) oaks in the Paso Robles area. Essentially all of it has been bad from the Oak’s point of view. Oaks have been in the news a lot recently. Department of Agriculture Miscellaneous Publications.Dirk Walters, illustration by Bonnie Walters Little, E.L., Jr., 1971-1978, Atlas of United States trees, volume 1,3,13,17, conifers and important hardwoods: U.S. Department of Agriculture Miscellaneous Publication 991, p. ISBN-13: 978-0520253124.Ĭritchfield, W.B., and Little, E.L., Jr., 1966, Geographic distribution of the pines of the world: U.S. University of California Press, Berkeley, CA. ![]() 2nd edition, thoroughly revised and expanded. The Jepson Manual: Vascular Plants of California. USDA Forest Service Agricultural Handbook 654.Ĭonsortium of Intermountain Herbaria. Silvics of North America (Volume 2: Hardwoods). New York and Oxford.īurns, R.M., and B.H. National Plant Data Team, Greensboro, NC 27401-4901 USA.įlora of North America Editorial Committee, eds. ![]() Repeated burning favors the shrubby growth form of canyon live oak. Canyon live oak can sprout within weeks after a fire, advancing regeneration and helping to maintain canyon live oak cover. Fire triggers a strong sprouting response in canyon live oak.Canyon live oak regenerates by sprouting from the root crown or bole after it is damaged or top-killed by fire. Canyon live oak acorns are generally destroyed by fire. Mortality may also result from root crown damage caused by smoldering leaf litter at the base of trees. Leaves may be heat-killed even if they do not burn. Trees can experience fatal cambium damage when the trunk and/or crown is burned. The bark can ignite even during a low-severity surface fire, carrying fire up the trunk and into the crown. Even relatively large canyon live oak trees, however, have thin, flaky outer bark that is easily ignited. Small canyon live oak trees and shrubs are more vulnerable to fire than large trees. Canyon live oak is a host of Phytophthora ramorum, the pathogen that causes sudden oak death disease in tanoak and many species of oak ( Quercus spp.) in California and Oregon.įire effects: Although canyon live oak is easily top-killed by fires of even relatively low severity, the entire tree is rarely killed. Where canyon live oak grows in association with California black oak, however, it may be more susceptible to oak wilt. In an inoculation experiment, canyon live oak was the least susceptible to oak wilt out of 7 species tested. Road cuts have exposed roots up to 7.3 m deep.Ĭanyon live oak is less susceptible to the oak wilt pathogen Ceratocystis fagacearum than the deciduous red or black oaks (subgenus Erythrobalanus) in California. Canyon live oak has a deep and extensive root system. Canyon live oak is a thin-barked tree for its size. In open areas the crown is dense, wide-spreading, and reaches nearly to the ground. Its size generally increases with soil depth. It grows as a shrub and may form dense thickets on mountain slopes and ridgetops, and it grows as a tree in sheltered, moist canyons. Its growth form varies depending on the site. It is a spreading, perennial, sclerophyllous evergreen that ranges from less than 5-30 m tall and up to 3.3 m DBH. (canyon live oak).Įcology: Canyon live oak is one of the most morphologically variable oaks in North America. Family - Fagaceae (beech) Genus - Quercus L. Division - Magnoliophyta (flowering plants). Superdivision - Spermatophyta (seed plants). Subkingdom - Tracheobionta (vascular plants).
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