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Oak Management in California

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Oak Management in California Oak Management Forest Service Pacific Southwest Forest and Range in California Experiment Station General Technical Report PSW-54 Timothy R. Plumb Philip M. McDonald Authors: TIMOTHY R. PLUMB is assigned to the Station's research unit studying the management of chaparral and related ecosystems in southern California, with head- quarters in Riverside, Calif. He attended Oregon State college, where he received a B.S. degree (1954) in forest management, and the University of California, Berkeley, where he received an M.S. degree (1959) in forestry. He received a doc- torate (1970) in plant physiology at the University of California, Riverside. PHILIP M. McDONALD is doing research on silviculture of Sierra Nevada forest types, with headquarters at Redding, Calif. He holds bachelor's (Washington State University, 1960) and master's (Duke University, 1961) degrees in forestry, and a Ph. D. degree in forest science (Oregon State University, 1978). Cover: A stand of old-growth valley oak (Quercus lobata ~6e)in Tehama County, California. Publisher: Pacific Southwest Forest and Range Experiment Station P.O. Box 245, Berkeley, California 94701 Oak Management in California Timothy R . Plumb Philip M . McDonald CONTENTS Introduction ................................................. 1 Speciesandstands ............................................2 Description ................................................2 Distribution ...............................................3 Inventory .................................................3 Oak Geography and Ecology ...................................5 Evolutionary Development ...................................5 Climatic Influence .......................................... 5 Fire Influence ..............................................6 OakManagement.............................................7 Stand Regeneration .........................................8 Fire as a Management Tool ...................................10 Future Directions ............................................11. Literature Cited ..............................................11 the northern Sierra Nevada, mixed stands of California black oak, tanoak, and Pacific madrone (Arbutus men- IN BRIEF ziesii Pursh) produce up to 93 ft3 of new growth per acre per year net (6.5 m^/ha/yr) for the first 6 years after thin- ning. Leaving 102 to 125 ft2 of basal area per acre (23 to Plumb, Timothy R., and Philip M. McDonald. 29 m2/ha) seems to balance available resources with 1981. Oak management in California. Gen. Tech. Rep. amount of growing stock, and if sustained, is a much bet- PSW-54, 12 p., illus. Pacific Southwest Forest and ter growth rate than that of unmanaged stands. Range Exp. Stn., Forest Serv., U.S. Dep. Agric., With management, stands of thrifty oaks should yield Berkeley, Calif. more wood, acorns, and water than similar unmanaged Retrieval Terms: Quercus spp., Lithocarpus densiflorus, stands, at no cost and probably even at a gain in esthetic California, timber management, silviculture, fire effects value. Recognition of these values could mean that native oaks are soon going to contribute to increased productivi- ty from California forests. Interest in native California oaks is increasing. Species Natural regeneration of oaks, in addition to root- like California black oak (Quercus kelloggii Newb.), blue crown sprouting, includes seedling establishment. oak (Q. douglasii Hook. & Arn.), coast live oak (Q. Acorns, disseminated by rodents, birds, and other agrifolia Nee), and tanoak (Lithocarpus densiflorus animals, enable oaks to occupy new areas; however, [Hook. & Arn.] Rehd.) constitute a huge reservoir of fuel regeneration from acorns is often poor especially for blue and fiber that at present is not being effectively used. and valley oaks (Q. lobata Nee) for reasons as yet Other "products" such as wildlife habitat, watershed unclear. For tanoak and California black oak, regenera- protection, and recreation-esthetic values may be more tion from acorns can be skimpy or abundant, depending important than traditional wood products. Although on a host of environmental factors and the voracity of little is known about the ecology and silviculture of wildlife. California oaks, some knowledge is emerging. This paper The plant propagator can gather acorns before they attempts to summarize this knowledge and to touch briefly mature, thus getting the jump on natural consumers. on wildlife, watershed, and esthetic considerations. Early-picked acorns can germinate successfully if the tips Of the 15 endemic oak species in California, 8-plus of the acorn shells are first removed. Positioning the tanoak-grow to tree size and should be amenable to acorn point up, rather than point down or sideways, also hardwood forest management. One or more species of speeds up germination and results in an increase in oak can be found throughout the State. They occupy number of acorns germinating. Optimum acorn storage several major vegetation zones or types including chapar- schedules are not yet known, but temperatures just above ral, woodland, mixed evergreen, and mixed conifer. Oaks freezing and moisture contents near 60 percent of fresh grow at elevations from near sea level to 10,000 feet weight appear best for scrub oak (Q. dumosa Nutt.) (3050 m), and where the growing season ranges from acorns picked in September. about 90 to 350 days. California oaks total about 3 Young-growth California black oak and tanoak billion ft3 (85 million m3) net volume; California black stumps sprout vigorously after cutting. Sprouts grow oak and tanoak account for 72 percent of this volume. rapidly; those of California black oak on good sites may However, total oak volume is actually much larger be over 19 feet (6 m) tall after 10 years. With such a because open-grown trees on noncommercial forest land growth rate, they are strong competitors with shrubs and are not included in these totals. other trees. Thinning sprouts at age 4 has been suggested, Most California oaks have adapted to harsh, semiarid, but tests show it results in no measurable gain in height environments. Paleobotanists have traced these oaks and growth. related communities back to the Miocene epoch of 12 to Vegetative propagation of oaks has not been used because 26 million years ago. Oak persistence is a function of high of the difficulty in rooting most oak species. Successful use adaptability. Thus, it is no surprise that native oaks have of tissue culture techniques has not been achieved either, a wide climatic amplitude and a rapid and dynamic re- although recent work with bud culture may have opened the sponse to gross disturbance such as fire. Oak species dif- way to practical clonal oak propagation. fer widely in their response to fire, however; bark Under natural conditions, fire is necessary for the thickness, amount of living and dead bark, and ability to perpetuation of oak woodlands, especially on sites where sprout from the bole all affect the probability that an oak oaks compete with faster growing conifers. Low intensity species will grow in an area of frequent fires. Sprouting prescribed fire may have a place as a management tool in from the root crown is the most important survival adap- established oak stands. Periodic burning would reduce tation of most oak species, and helps to maintain estab- the fuel accumulations that support high intensity lished stands. wildfires which kill or severely damage tree trunks and For the silviculturist, there is evidence that dense crowns. However, even prescribed fire must be used with 60-year-old stands respond to thinning. On a good site in caution because every fire will cause some tree damage. Figure 1-This 110-foot tall, 24-inch-diameter Cali- fornia black oak in Butte County is suitable for manufacture into several valuable wood products. Figure 2-An open, spreading crown and large, crooked branches are typical of many Cali- fornia oaks. Figure 3-Acorns and foliage from California black oak are food much sought after by deer. ne of California's most valuable natural resources- And, although not recognized widely, acorns are a poten- 0 its extensive oak forests and woodlands-has long tial energy-rich food source for humans as well. Because been neglected and mistreated. Often, the oaks have been deciduous hardwoods do not intercept rain and snow to the target of eradication efforts aimed at enhancing other the extent that conifers do, less moisture evaporates from resource values. Interest in the ecology, management, them. For example, water savings of up to 32 percent of and perpetuation of oak woodlands has increased drama- annual precipitation have been realized from hardwood tically in the last few years. Although in the past, oak has stands as compared to conifer stands (Urie 1977). Among not been totally ignored by the scientific community, all the values for which oaks are managed, that of pro- most forest managers would agree that guides for oak viding scenic beauty cannot be ignored (fie. 4). management are based on inadequate data. Much that is known about California oaks has been This report presents available information for the available only in unpublished reports, dissertations, or management of the entire oak resource in California. Oak case histories. A recent symposium has placed a con- stands can be managed for many commodities and siderable portion of this material in the literature (Plumb amenities. Hardwood trees of good form (fig. 1) can be 1980). Here we present in summary form the ecological manufactured into
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