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Repeated manual release in a young plantation : effect on Douglas-fir seedlings, hardwoods, shrubs, forbs, and grasses

Author: Philip M McDonald; Gary Fiddler; Henry R Harrison; Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
Publisher: Albany, Calif. (P.O. Box 245, Berkeley 94701-0245) : U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Research Station, [1994]
Series: Research paper PSW, 221.
Edition/Format:   Book   Microform : National government publication : Microfiche : EnglishView all editions and formats
Database:WorldCat
Summary:
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,  Read more...
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Details

Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Philip M McDonald; Gary Fiddler; Henry R Harrison; Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)
OCLC Number: 32155217
Notes: Distributed to depository libraries in microfiche.
Shipping list no.: 94-0802-M.
"August 1994"--Title page verso.
Reproduction Notes: Microfiche. [Washington, D.C.?] : Supt. of Docs., U.S. G.P.O., [1994]. 1 microfiche : negative.
Description: ii, 11 pages : illustrations.
Series Title: Research paper PSW, 221.
Other Titles: Effect on Douglas-fir seedlings, hardwoods, shrubs, forbs, and grasses
Responsibility: Philip M. McDonald, Gary O. Fiddler, Henry R. Harrison.

Abstract:

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.

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