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DOI | 10.1016/j.foreco.2016.11.028 |
Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings | |
Brantley, Steven T.1; Mayfield, Albert E., III2; Jetton, Robert M.3; Miniat, Chelcy F.1; Zietlow, David R.1; Brown, Cindi L.1; Rhea, James R.4 | |
2017-02-01 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT
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ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2017 |
卷号 | 385 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Adelges tsugae Invasive species Nonstructural carbohydrates Shade Tsuga canadensis |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392680800016 |
WOS关键词 | SAP-FEEDING INSECT ; TSUGA-CANADENSIS ; HEMIPTERA ADELGIDAE ; FOLIAR CHEMISTRY ; NEW-ENGLAND ; SOUTHERN APPALACHIANS ; LOW-TEMPERATURES ; FOREST CARBON ; UNITED-STATES ; HOMOPTERA |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/23038 |
专题 | 气候变化 |
作者单位 | 1.US Forest Serv, USDA, Southern Res Stn, Coweeta Hydrol Lab, 3160 Coweeta Lab Rd, Otto, NC 28763 USA; 2.US Forest Serv, USDA, Southern Res Stn, 200 WT Weaver Blvd, Asheville, NC 28804 USA; 3.North Carolina State Univ, Dept Forestry & Environm Resources, Camcore, 2720 Faucette Dr,3229 Jordan Hall Addit, Raleigh, NC 27695 USA; 4.US Forest Serv, USDA, Forest Hlth Protect Reg Field Off 8, 200 WT Weaver Blvd, Asheville, NC 28804 USA |
推荐引用方式 GB/T 7714 | Brantley, Steven T.,Mayfield, Albert E., III,Jetton, Robert M.,et al. Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings[J]. FOREST ECOLOGY AND MANAGEMENT,2017,385. |
APA | Brantley, Steven T..,Mayfield, Albert E., III.,Jetton, Robert M..,Miniat, Chelcy F..,Zietlow, David R..,...&Rhea, James R..(2017).Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings.FOREST ECOLOGY AND MANAGEMENT,385. |
MLA | Brantley, Steven T.,et al."Elevated light levels reduce hemlock woolly adelgid infestation and improve carbon balance of infested eastern hemlock seedlings".FOREST ECOLOGY AND MANAGEMENT 385(2017). |
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