DOI: 10.1016/j.foreco.2015.02.007
Scopus记录号: 2-s2.0-84923343880
论文题名: Variable effects of timber harvest on the survival, growth, and reproduction of American ginseng (Panax quinquefolius L.)
作者: Chandler J.L. ; McGraw J.B.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 344 起始页码: 1
结束页码: 9
语种: 英语
英文关键词: American ginseng
; Canopy disturbance
; Logging
; Panax quinquefolius L
; Timber harvest
Scopus关键词: Conservation
; Efficiency
; Growth rate
; Harvesting
; Logging (forestry)
; Plants (botany)
; Population statistics
; Seed
; Timber
; American ginseng
; Canopy disturbance
; Germination conditions
; Panax quinquefolius L
; Relative growth rate
; Silvicultural strategies
; Timber harvests
; Understory response
; Forestry
; deciduous forest
; disturbance
; forest canopy
; forest dynamics
; growth rate
; herb
; old-growth forest
; reproduction
; seed production
; survival
; timber harvesting
; Panax ginseng
; Panax quinquefolius
英文摘要: Timber harvest is a recurrent, widespread canopy disturbance that has long-affected the eastern deciduous forest. Multi-dimensional shifts in forest dynamics occur following timbering, and while a great deal of research on tree response to timbering has been performed, far less focus has been placed on herbaceous understory response to timbering. American ginseng (Panax quinquefolius L.) is a long-lived, economically valuable medicinal herb believed to be adapted to the dynamic light conditions of old-growth forests. The purpose of this study was to determine if timber harvests of varying intensity had positive, neutral, or negative effects on the survival, growth, and reproduction of wild American ginseng. Hemispherical images were used to calculate the canopy openness above ginseng plants. Population census data were used to obtain measurements of survival, relative growth rate, seed production, seed production efficiency, and new seedling emergence. Changes in survival and seed production in response to timbering were analyzed using log-likelihood analyses, and the responses of relative growth rate and seed production efficiency to timbering were analyzed using nested two-way ANOVAs. Initial ginseng survival varied among sites, with lowest survival at the more intensely timbered site. Additionally, long-term survival decreased following timbering. Relative growth rate of individuals increased following timbering in both short-term and long-term analyses, with relative growth rate being greatest at sites where more tree biomass was removed. While seed production decreased the year directly following timbering, seed production increased over the three years after timbering. Both short-term and long-term effects of timbering on seed production efficiency differed among populations. While seed production increases in the years after timbering, this stimulation may not be realized due to sub-optimal germination conditions. Due both to decreases in survival following timbering and the unlikely continued increases in growth and seed production as the canopy fills in, some of these often-used timbering strategies negatively impact ginseng performance. Silvicultural strategies that mimic old-growth forest structure may be better suited for the conservation of ginseng and other similar obligate understory species. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65493
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, West Virginia University, 53 Campus Drive, Morgantown, WV, United States
Recommended Citation:
Chandler J.L.,McGraw J.B.. Variable effects of timber harvest on the survival, growth, and reproduction of American ginseng (Panax quinquefolius L.)[J]. Forest Ecology and Management,2015-01-01,344