Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Repeated manual release in a young plantation : effect on Douglas-fir seedlings, hardwoods, shrubs, forbs, and grasses /
Author McDonald, Philip M.
Other Authors
Author Title of a Work
Fiddler, Gary.
Harrison, Henry R.
Publisher U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Research Station,
Year Published 1994
OCLC Number 34908191
Subjects Douglas fir--California--Seedlings. ; Ecosystem management--California. ; Plant communities--California. ; Douglas fir--Seedlings.
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ESBD  A13.78 PSW-RP-221 CPHEA/PESD Library/Corvallis,OR 10/11/1996
Collation ii, 11 pages : illustrations ; 28 cm.
Includes bibliographical references (page 11).
Contents Notes
Douglas-fir seedlings on the Arcata Resource Area, Bureau of Land Management, U.S. Department of the Interior, in central coastal California, were released by chain sawing and grubbing competing vegetation around them at different frequencies (0, 2, and 3 grubbings) over a 5-year period. After 5 years, average Douglas-fir stem diameter (measured at 12 inches above mean groundline) of seedlings grubbed at ages 1,2, and 5 was 0.91 inches, and of seedlings grubbed after the first and fifth growing season was 0.95 inches. Both were significantly larger than counterparts in the control (0.57 inches). Tanoak, the most competitive species, constituted 84 percent of total plant cover in the control after 5 years, but only 25 percent on treated plots. Combined shrubs varied little between the untreated control and treated plots and averaged about 7 percent of total foliar cover. Grasses were not present in the control and only for the fifth year in treated plots. The most abundant forb, a hedge nettle, increased greatly in density in both control and treated plots. These relationships and others denoted in the paper yield valuable ecological information on species and community dynamics in both a natural and treated environment. Crew time (no overhead or travel costs) for the three grubbings was 52 hours and for the two grubbings was 44 hours.