DOI: 10.1016/j.foreco.2012.09.034
Scopus记录号: 2-s2.0-84869876691
论文题名: Regeneration responses to exogenous disturbance gradients in southern Appalachian Picea-Abies forests
作者: Stehn S.E. ; Jenkins M.A. ; Webster C.R. ; Jose S.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 289 起始页码: 98
结束页码: 105
语种: 英语
英文关键词: Forest regeneration
; Great Smoky Mountains National Park
; Invasive insects
; Patch dynamics
; Soil chemistry
; Tree mortality
Scopus关键词: Forest regeneration
; Great Smoky Mountains National Park
; Invasive insects
; Patch dynamics
; Soil chemistry
; Tree mortality
; Acidification
; Air pollution
; Aluminum
; Regression analysis
; Reforestation
; acid deposition
; coniferous forest
; deciduous forest
; disturbance
; endemic species
; insect
; invasive species
; landscape ecology
; mortality
; overstory
; patch dynamics
; plant community
; regeneration
; soil chemistry
; soil horizon
; spatial variation
; North America
; Abies
; Abies fraseri
; Adelges piceae
; Adelgidae
; Hexapoda
; Picea
; Picea abies
; Picea rubens
; Rubus
英文摘要: Because of the devastation caused by the combined impacts of the balsam woolly adelgid (Adelges piceae; BWA, a non-native insect) and chronic acid deposition, Picea-Abies (spruce-fir) forests are one of the most threatened vegetation communities in North America. Endemic Abies fraseri (Fraser fir), the dominant overstory species in these forests, has experienced near complete overstory mortality as result of the adelgid. Observed forest regeneration patterns suggest high spatial variability, with dense patches of Rubus spp. (blackberry), A. fraseri, and deciduous regeneration repeating across the landscape. To quantify the spatial variability and density of A. fraseri, Picea rubens (red spruce), and deciduous regeneration in these forests, we sampled 60 randomly selected plots within Picea-Abies forests of Great Smoky Mountains National Park (GSMNP). As a measure of local variability in regeneration, we used regeneration density within 30 1. ×. 1. m subplots per plot to calculate a coefficient of within-plot variation for each species. Despite the impacts of the BWA and chronic acid deposition, A. fraseri remained an important component of southern Appalachian Picea-Abies forests at elevations above 1750. m. Density of A. fraseri in all size classes was associated with time since disturbance by BWA infestation. On plots where A. fraseri regeneration occurred, its local variability (among 30 subplots) was significantly greater than that of P. rubens or deciduous species. Regression models attributed this local-scale variability in A. fraseri regeneration to the influence of elevation, Rubus spp. cover, B-horizon nitrogen concentration, and O-horizon calcium to aluminum ratio. We propose that co-occurring gradients of BWA-induced mortality and acid deposition have created patches of increased light and nitrogen availability, which have increased competition from ruderal species such as Rubus spp. Additionally, our results suggest that high soil aluminum content relative to calcium may exclude A. fraseri from certain locations, further contributing to the local variability of A. fraseri regeneration. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66825
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: School of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, United States; Denali National Park and Preserve and Central Alaska Network, National Park Service, P.O. Box 9, Denali Park, AK 99755, United States; Department of Forestry and Natural Resources, Purdue University, 715 West State Street, West Lafayette, IN 47907, United States; School of Natural Resources, University of Missouri, 203 Anheuser-Busch Natural Resources Building, Columbia, MO 65211, United States
Recommended Citation:
Stehn S.E.,Jenkins M.A.,Webster C.R.,et al. Regeneration responses to exogenous disturbance gradients in southern Appalachian Picea-Abies forests[J]. Forest Ecology and Management,2013-01-01,289