DOI: 10.1016/j.quascirev.2015.08.019
Scopus记录号: 2-s2.0-84940760927
论文题名: Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake
作者: Tinner W. ; Beer R. ; Bigler C. ; Clegg B.F. ; Jones R.T. ; Kaltenrieder P. ; van Raden U.J. ; Gilli A. ; Hu F.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 126 起始页码: 41
结束页码: 56
语种: 英语
英文关键词: 2.8 ka event
; 2800 event
; Boreal
; Climate change
; Erosion
; Fire
; Paleoecology
; Vegetation
Scopus关键词: Charcoal
; Ecology
; Erosion
; Fires
; Forestry
; Lakes
; Moisture
; Particle size
; Plants (botany)
; Sediments
; Solar energy
; Solar radiation
; Vegetation
; 2.8 ka event
; 2800 event
; Atmospheric reorganization
; Boreal
; Element compositions
; Environmental dynamics
; Northern Hemispheres
; Paleoecology
; Climate change
; boreal forest
; climate variation
; coniferous forest
; diatom
; ecosystem response
; forest cover
; Holocene
; Northern Hemisphere
; paleoecology
; paleoenvironment
; radiocarbon dating
; sediment analysis
; soil erosion
; vegetation history
; Ecosystems
; Lakes
; Moisture
; Particle Size
; Picea Engelmannii
; Seasonal Variation
; Sediments
; Alaska
; United States
; Alnus viridis
; Bacillariophyta
; Betula
; Chironomidae
; Epilobium
; Picea glauca
; Picea mariana
英文摘要: The late-Holocene shift from Picea glauca (white spruce) to Picea mariana (black spruce) forests marked the establishment of modern boreal forests in Alaska. To understand the patterns and drivers of this vegetational change and the associated late-Holocene environmental dynamics, we analyzed radiocarbon-dated sediments from Grizzly Lake for chironomids, diatoms, pollen, macrofossils, charcoal, element composition, particle size, and magnetic properties for the period 4100-1800 cal BP. Chironomid assemblages reveal two episodes of decreased July temperature, at ca. 3300-3150 (ca -1 °C) and 2900-2550 cal BP (ca -2 °C). These episodes coincided with climate change elsewhere in the Northern Hemisphere, atmospheric reorganization, and low solar activity. Diatom-inferred lake levels dropped by ca. 5 m at 3200 cal BP, suggesting dry conditions during the period 3200-1800 cal BP. P. glauca declined and P. mariana expanded at ca. 3200 cal BP; this vegetational change was linked to diatom-inferred low lake levels and thus decreased moisture availability. Forest cover declined at 3300-3100, 2800-2500 and 2300-2100 cal BP and soil erosion as inferred from increased values of Al, K, Si, Ti, and Ca intensified, when solar irradiance was low. Plant taxa adapted to disturbance and cold climate (e.g. Alnus viridis, shrub Betula, Epilobium) expanded during these periods of reduced forest cover. This open vegetation type was associated with high fire activity that peaked at 2800 cal BP, when climatic conditions were particularly cold and dry. Forest recovery lagged behind subsequent climate warming (≤+3 °C) by ca. 75-225 years. Our multiproxy data set suggests that P. glauca was dominant under warm-moist climatic conditions, whereas P. mariana prevailed under cold-dry and warm-dry conditions. This pattern implies that climatic warming, as anticipated for this century, may promote P. glauca expansions, if moisture availability will be sufficiently high, while P. mariana may expand under dry conditions, possibly exacerbating climate impacts on the fire regime. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59814
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, Bern, Switzerland; Department of Plant Biology, University of Illinois, 505 South Goodwin Avenue, 265 Morrill Hall, Urbana, IL, United States; Department of Geology, University of Illinois, 505 South Goodwin Avenue, 265 Morrill Hall, Urbana, IL, United States; Department of Ecology and Environmental Science, Umeå, Sweden; School of Integrative Biology, University of Illinois, 505 South Goodwin Avenue, 286 Morill Hall, Urbana, IL, United States; Department of Geography, University of Exeter, Exeter, Devon, United Kingdom; Geological Institute, ETH Zurich, Sonneggstrasse 5, Zus, Switzerland
Recommended Citation:
Tinner W.,Beer R.,Bigler C.,et al. Late-Holocene climate variability and ecosystem responses in Alaska inferred from high-resolution multiproxy sediment analyses at Grizzly Lake[J]. Quaternary Science Reviews,2015-01-01,126