DOI: 10.1016/j.foreco.2016.12.028
Scopus记录号: 2-s2.0-85009740682
论文题名: The response of Fraxinus nigra forest ground-layer vegetation to emulated emerald ash borer mortality and management strategies in northern Minnesota, USA
作者: Looney C.E. ; D'Amato A.W. ; Palik B.J. ; Slesak R.A. ; Slater M.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 389 起始页码: 352
结束页码: 363
语种: 英语
Scopus关键词: Groundwater
; Plants (botany)
; Reforestation
; Wetlands
; Agrilus planipennis
; Artificial regeneration
; Background variation
; Community composition
; Competition control
; Great Lakes regions
; Management activities
; Management strategies
; Forestry
; beetle
; bioindicator
; biological invasion
; clearcutting
; group selection
; herb
; host plant
; mortality
; pest control
; plant community
; regeneration
; shrub
; wetland
; Great Lakes [North America]
; Minnesota
; United States
; Agrilus planipennis
; Fraxinus
; Fraxinus nigra
; Hexapoda
; Ulmus americana
英文摘要: When an invasive organism targets a dominant tree species, it can trigger unprecedented shifts in forest plant communities. Emerald ash borer (EAB; Agrilus planipennis Fairmaire), an invasive insect that kills by girdling trees, represents a significant threat to North American Fraxinus (ash) species. EAB has already decimated many Fraxinus populations and threatens loss of overstory cover in Great Lakes region wetland forests dominated by Fraxinus nigra (black ash). Canopy treatments, such as clearcutting and group selection, are being evaluated to promote regeneration of non-EAB-host tree species. Studies suggest clearcutting may raise water tables, lower tree regeneration, and shift the composition of woody and herbaceous ground-layer plant communities. However, no empirical research to date has examined the effects of canopy treatments on ground-layer plant communities in F. nigra wetlands. We used a large-scale field experiment in northern Minnesota F. nigra wetlands to examine the response of the woody and herbaceous ground-layer to four overstory treatments: clearcutting, group selection, F. nigra girdling, and unharvested forest. Our objectives were to determine: (1) to what extent established regeneration of associated tree species could be expected to contribute to overstory maintenance under EAB- and management-induced canopy changes; (2) the impact of canopy changes on the composition of the overall woody ground-layer; and (3) the effect of canopy treatments on the herbaceous layer. We found density of established tree regeneration was significantly higher in the clearcut treatment than in the group selection, girdle, and control. Fraxinus nigra had the highest seedling density in all treatments, while Ulmus americana (American elm) was the most abundant non-EAB-host tree species across treatments. Regeneration density of associated tree species varied by treatment and fell short of seedling stocking guidelines. Background variation in experimental blocks exerted a greater influence than treatment on overall woody community composition. Treatment influenced herbaceous layer height, but did not significantly impact total cover. Herbaceous species richness and diversity increased in all treatments, with the clearcut and group selection moving toward greater graminoid cover, while the control and girdling treatment increased in wetland indicator species. Our findings suggest artificial regeneration, combined with herbaceous and shrub competition control treatments, will be necessary to restock F. nigra forests following EAB invasion. Sites with lower abundance of shrub species and higher established tree regeneration should be prioritized for management activities. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64467
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Minnesota, Department of Forest Resources, St. PaulMN, United States; University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, VT, United States; USDA Forest Service, Northern Research Station, Grand Rapids, MN, United States; Minnesota Forest Resources Council, St. PaulMN, United States
Recommended Citation:
Looney C.E.,D'Amato A.W.,Palik B.J.,et al. The response of Fraxinus nigra forest ground-layer vegetation to emulated emerald ash borer mortality and management strategies in northern Minnesota, USA[J]. Forest Ecology and Management,2017-01-01,389