DOI: 10.1016/j.foreco.2014.02.002
Scopus记录号: 2-s2.0-84895762671
论文题名: Conifer reinvasion of montane meadows following experimental tree removal and prescribed burning
作者: Kremer N.J. ; Halpern C.B. ; Antos J.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 319 起始页码: 128
结束页码: 137
语种: 英语
英文关键词: Conifer establishment
; Edge effects
; Forest influence
; Meadow restoration
; Seed dispersal
; Seedling establishment
Scopus关键词: Facings
; Restoration
; Spatial distribution
; Conifer establishment
; Edge effect
; Forest influence
; Seed dispersal
; Seedling establishment
; Forestry
; biological invasion
; coniferous forest
; edge effect
; forest ecosystem
; habitat restoration
; meadow
; prescribed burning
; removal experiment
; restoration ecology
; seed dispersal
; seedling establishment
; spatial distribution
; Forests
; Seeds
; Softwoods
; Oregon
; United States
英文摘要: Tree invasion of mountain grasslands and meadows, pervasive throughout western North America, has become a management concern. Restoration of these systems requires tree removal and possibly prescribed burning; however, subsequent reinvasion by trees may compromise these efforts. In this study, we assess patterns of tree seedling establishment 8. years after tree removal (with and without burning) from 1-ha experimental plots in conifer-invaded meadows in the Oregon Cascades. We quantify variation in the timing, spatial distribution, and density of establishment of species with differing seral roles; compare effects of burning; and explore relationships with distance to and characteristics of adjacent, residual forests. Seedlings established continuously after tree removal, dominated by late-seral Abies grandis (cumulative plot densities of 116-460/ha). Early-seral Pinus contorta and Pseudotsuga menziesii were much less abundant (0-25 and 1-52/ha, respectively). Frequency (percentage of 5. ×. 5. m subplots) and density of seedlings did not differ between treatments (burned vs. unburned), nor did seedling growth rates (inferred from height-age relationships). Seedling spatial distributions and relationships with distance to adjacent forest varied both within and among plots. On average, however, seedlings were concentrated along edges. In the 5-m outer band of subplots, frequency averaged 37% and density, 682/ha, compared to 18% and 140/ha in the remaining cores of the plots. Density of Abies was significantly greater along more shaded southern edges (north-facing) than along more exposed northern edges (south-facing), but it declined steeply with distance from edge, especially for southern edges. Plot-level density of Abies seedlings was also correlated with basal area of Abies in the adjacent forest (but not with tree density or summed height). Strong relationships of seedlings with distance, exposure, and characteristics of adjacent forests suggest that conifer reinvasion can be minimized by targeting tree removal to maximize distances to residual trees. However, absence of a treatment effect suggests that burning-critical for reducing woody residues-does not increase the probability of seedling establishment, particularly in systems in which late-seral species are the principal colonists. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66034
Appears in Collections: 影响、适应和脆弱性
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作者单位: Bordeaux Sciences Agro, CS 40201, 33175 Gradignan, Bordeaux, France; School of Environmental and Forest Sciences, College of the Environment, University of Washington, Seattle, WA 98195, United States; Department of Biology, University of Victoria, P.O. Box 3020, British Columbia V8W 3N5 VIC, Canada
Recommended Citation:
Kremer N.J.,Halpern C.B.,Antos J.A.. Conifer reinvasion of montane meadows following experimental tree removal and prescribed burning[J]. Forest Ecology and Management,2014-01-01,319