DOI: 10.1016/j.foreco.2012.10.004
Scopus记录号: 2-s2.0-84869884387
论文题名: Organic, elemental, and geochemical contributions to lake sediment deposits during severe spruce beetle (Dendroctonus rufipennis) disturbances
作者: Morris J.L. ; le Roux P.C. ; Macharia A.N. ; Brunelle A. ; Hebertson E.G. ; Lundeen Z.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 289 起始页码: 78
结束页码: 89
语种: 英语
英文关键词: C/N ratio
; Dendroctonus rufipennis
; Disturbance
; GLMM
; Lake sediments
; Spruce beetle
Scopus关键词: C/N ratio
; Dendroctonus
; Disturbance
; GLMM
; Lake sediments
; Spruce beetles
; Deposits
; Lakes
; Leaching
; Magnetic susceptibility
; Sedimentology
; Sediments
; Forestry
; basin analysis
; beetle
; defoliation
; disturbance
; ecological impact
; historical record
; lacustrine deposit
; magnetic susceptibility
; mortality
; native species
; pest outbreak
; soil erosion
; United States
; Utah
; Abies
; algae
; Coleoptera
; Dendroctonus rufipennis
; Picea
; Picea engelmannii
; Scolytinae
英文摘要: Recent outbreaks of native bark beetles are unprecedented during the historical period. The aim of this manuscript is to develop a proxy-based methodology to infer past bark beetle outbreaks using lake sediments to provide long-term context for recent outbreaks. We test three hypotheses to determine how the ecological impacts of severe spruce beetle (Dendroctonus rufipennis Kirby) disturbances are recorded in lake sediment deposits. The resulting mortality and defoliation of Engelmann spruce is hypothesized to: (1) decrease the ratio of spruce to fir pollen; (2) reduce canopy interception of precipitation leading to an increase in soil erosion and/or enhanced mobilization of terrestrial carbon; and (3) leach foliar nitrogen and enhance algal productivity resulting in increased nitrogen values in lake sediments. To test these hypotheses, we analyzed sediment cores from six spruce beetle-affected basins in Utah for spruce/fir pollen ratio (hypothesis 1), loss-on-ignition, magnetic susceptibility of sediments (hypothesis 2), and δ13CBOM, δ15NTN, elemental C and N, and the C/N ratio of bulk organic material (hypotheses 2 and 3). The dataset was statistically tested using general linear mixed models (GLMMs) to determine if the response variables differed significantly between outbreak and non-outbreak period. The spruce/fir pollen ratio responded significantly to outbreaks at all sites suggesting that this metric may be the most suitable for identifying past spruce beetle outbreaks. For our second hypothesis we found little support for an influx of terrestrial C due to strongly individualist responses of the basins. For our third hypotheses we found little support for increased sedimentary nitrogen, likely due to alterations to nutrient cycling from human activities. Therefore the host/non-host pollen ratio provides the most promising metric for detecting past outbreaks. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66828
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geosciences and Geography, University of Helsinki, Gustaf Hällströmin katu 2a, Helsinki 00014, Finland; Department of Geography, University of Utah, 260 S. Central Campus Dr., Salt Lake City, UT 841112, United States; USDA Forest Service, Forest Health Protection-Ogden Field Office, 4746 South 1900 East, Ogden, UT 84403, United States; Rio Mesa Center, University of Utah, 201 S. President's Circle Room 210, Salt Lake City, UT 84112, United States
Recommended Citation:
Morris J.L.,le Roux P.C.,Macharia A.N.,et al. Organic, elemental, and geochemical contributions to lake sediment deposits during severe spruce beetle (Dendroctonus rufipennis) disturbances[J]. Forest Ecology and Management,2013-01-01,289