DOI: 10.1016/j.foreco.2012.10.053
Scopus记录号: 2-s2.0-84871916953
论文题名: Restoration release of overtopped Oregon white oak increases 10-year growth and acorn production
作者: Devine W.D. ; Harrington C.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 291 起始页码: 87
结束页码: 95
语种: 英语
英文关键词: Acorn production
; Oregon white oak
; Quercus garryana
; Release
; Restoration
; Suppression
Scopus关键词: Acorn production
; Quercus
; Release
; Suppression
; White oak
; Image reconstruction
; Restoration
; Forestry
; basin analysis
; coniferous forest
; ecoregion
; growth rate
; overstory
; overtopping
; restoration ecology
; seed production
; stand dynamics
; tree planting
; Forestry
; Image Analysis
; Quercus Alba
; Quercus Garryana
; Release
; Restoration
; British Columbia
; Canada
; Georgia Basin
; Oregon
; Pacific Northwest
; Puget Trough
; United States
; Washington [United States]
; Willamette Valley
; Abies
; Coniferophyta
; Pseudotsuga
; Pseudotsuga menziesii
; Quercus
; Quercus garryana
英文摘要: In the Willamette Valley-Puget Trough-Georgia Basin ecoregion of the North American Pacific Northwest, there has been widespread encroachment of Douglas-fir (Pseudotsuga menziesii) upon Oregon white oak (Quercus garryana) savanna and woodland stands that were historically maintained by frequent anthropogenic fire. Restoration of these stands requires removal of the Douglas-fir overstory, although there is little information on how oak trees that have been suppressed for decades respond to release. Our objective was to evaluate the 10-year response of oak trees to three release treatments from overtopping Douglas-fir in a study replicated at four western Washington sites. Treatments were: full release (removal of all Douglas-fir within a radius equal to the oak's height), half release (removal of Douglas-fir within a half-height radius), and thin only (stand-level commercial thinning of the Douglas-fir overstory; oaks not targeted for release). Periodic diameter growth of oak trees in the full-release treatment was significantly greater (by as much as 243%) than that in the other treatments and increased with time since treatment. Oak height and crown area growth rates were not influenced by treatment, but larger pre-treatment crown size was associated with greater post-treatment diameter growth and acorn production. Full release increased acorn production compared to thin only in years when region-wide production was moderate to high (5 of 9. years); half release increased production relative to thin only in 2 of 9. years, but to a lesser degree. Height growth of residual Douglas-fir trees was greater than that of oak trees in all treatments. The increasing post-treatment growth rate of the fully released oak trees and their increased acorn production indicate the capacity of long-suppressed Oregon white oak to rapidly recover following complete removal of a conifer overstory. The oak trees showed no negative effects following the dramatic change in environment associated with this treatment. Thus, a single-entry, complete release from overtopping conifers was effective in restoring overstory structure and composition, which is an initial step in restoration of invaded oak woodland or savanna. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66759
Appears in Collections: 影响、适应和脆弱性
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作者单位: 3625 93rd Ave. SW, Olympia WA 98512, United States; USDA Forest Service Pacific Northwest Research Station, 3625 93rd Ave. SW, Olympia WA 98512, United States
Recommended Citation:
Devine W.D.,Harrington C.A.. Restoration release of overtopped Oregon white oak increases 10-year growth and acorn production[J]. Forest Ecology and Management,2013-01-01,291