DOI: 10.1016/j.foreco.2016.11.028
Scopus记录号: 2-s2.0-85000366255
论文题名: Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings
作者: Brantley S.T. ; Mayfield A.E. ; III ; Jetton R.M. ; Miniat C.F. ; Zietlow D.R. ; Brown C.L. ; Rhea J.R.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 385 起始页码: 150
结束页码: 160
语种: 英语
英文关键词: Adelges tsugae
; Invasive species
; Nonstructural carbohydrates
; Shade
; Tsuga canadensis
Scopus关键词: Carbohydrates
; Conservation
; Plants (botany)
; Adelges tsugae
; Invasive species
; Non-structural carbohydrates
; Shade
; Tsuga canadensis
; Forestry
; biocontrol agent
; bioindicator
; carbohydrate
; carbon balance
; coniferous tree
; ecosystem function
; ecosystem structure
; experimental study
; invasive species
; light intensity
; parasite infestation
; seedling
; shade tolerance
; silviculture
; Adelges tsugae
; Adelgidae
; Coleoptera
; Hexapoda
; Tsuga canadensis
英文摘要: The rapid loss of eastern hemlock (Tsuga canadensis) due to infestation with hemlock woolly adelgid (Adelges tsugae, HWA) has greatly altered structure and function of eastern forests. Numerous control strategies including local pesticide use and biocontrol with predator beetles have been implemented with considerable cost and varying success. Silviculture treatments that increase incident light on surviving hemlock trees to reduce infestation and ameliorate carbon starvation have been proposed as another possible conservation strategy, yet no controlled studies have evaluated the coupled plant-insect responses to increased light. We conducted a nursery experiment on artificially infested eastern hemlock seedlings under varying levels of ambient light, ranging from 0 to 90% shade. We measured HWA infestation (ovisac density), short- and long-term indicators of carbon balance (leaf chlorophyll fluorescence, net photosynthesis, total nonstructural carbohydrate content, and shoot growth), and nutrition (leaf N content). We hypothesized that higher light would result in reduced HWA densities, higher C assimilation rates, and improved tissue non-structural carbohydrate balance; and these effects would ameliorate the effects of infestation on C balance and lead to improved seedling growth. HWA density decreased with increasing light, and was highest in the 90% shade treatments. However, photosystem II efficiency and net assimilation were also lower under the higher light treatment. Despite tradeoffs between reduced infestation and reduced leaf function from higher light, and little variation in sugar content among treatments, both leaf and root starch content and seedling growth were higher under the higher light treatment. Increasing light levels improves long-term carbon balance for hemlock seedlings in the presence of HWA. Although hemlock typically occurs in deeply shaded forests, our results suggest that silvicultural treatments such as forest thinning that increase light exposure may reduce HWA abundance and lead to better tree C balance, and may be an effective component of large-scale conservation and restoration strategies. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64559
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: USDA Forest Service, Southern Research Station, Coweeta Hydrologic Lab, 3160 Coweeta Lab Road, Otto, NC, United States; USDA Forest Service, Southern Research Station, 200 W.T. Weaver Boulevard, Asheville, NC, United States; Camcore, Department of Forestry and Environmental Resources, 2720 Faucette Drive, 3229 Jordan Hall Addition, North Carolina State University, Raleigh, NC, United States; USDA Forest Service, Forest Health Protection Region 8 Field Office, 200 W. T. Weaver Boulevard, Asheville, NC, United States
Recommended Citation:
Brantley S.T.,Mayfield A.E.,III,et al. Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings[J]. Forest Ecology and Management,2017-01-01,385