DOI: 10.1016/j.quascirev.2016.02.013
Scopus记录号: 2-s2.0-84959376279
论文题名: The impact and significance of tephra deposition on a Holocene forest environment in the North Cascades, Washington, USA
作者: Egan J. ; Fletcher W.J. ; Allott T.E.H. ; Lane C.S. ; Blackford J.J. ; Clark D.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 137 起始页码: 135
结束页码: 155
语种: 英语
英文关键词: Glacier peak
; Holocene environmental change
; Mazama
; Pollen
; Redundancy analysis
; Tephra impact
Scopus关键词: Forestry
; Redundancy
; Stratigraphy
; Vegetation
; Environmental change
; Mazama
; Pollen
; Redundancy analysis
; Tephra impact
; Deposition
; algae
; Cyperaceae
; Equisetum
; Mazama
; Myriophyllum spicatum
; Pediastrum
; Poaceae
; Potamogeton
英文摘要: High-resolution palaeoecological analyses (stratigraphy, tephra geochemistry, radiocarbon dating, pollen and ordination) were used to reconstruct a Holocene vegetation history of a watershed in the Pacific Northwest of America to evaluate the effects and duration of tephra deposition on a forest environment and the significance of these effects compared to long-term trends. Three tephra deposits were detected and evaluated: MLF-T158 and MLC-T324 from the climactic eruption of Mount Mazama, MLC-T480 from a Late Pleistocene eruption of Mount Mazama and MLC-T485 from a Glacier Peak eruption. Records were examined from both the centre and fringe of the basin to elucidate regional and local effects. The significance of tephra impacts independent of underlying long-term trends was confirmed using partial redundancy analysis. Tephra deposition from the climactic eruption of Mount Mazama approximately 7600 cal. years BP caused a significant local impact, reflected in the fringe location by changes to open habitat vegetation (Cyperaceae and Poaceae) and changes in aquatic macrophytes (Myriophyllum spicatum, Potamogeton, Equisetum and the alga Pediastrum). There was no significant impact of the climactic Mazama tephra or other tephras detected on the pollen record of the central core. Changes in this core are potentially climate driven. Overall, significant tephra fall was demonstrated through high resolution analyses indicating a local effect on the terrestrial and aquatic environment, but there was no significant impact on the regional forest dependent of underlying environmental changes. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59646
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geography, School of Environment, Education and Development and University of Manchester, Oxford Road, Manchester, United Kingdom; Department of Geography, Edge Hill University, St Helens Road, Ormskirk, Lancashire, United Kingdom; Department of Geography, Environment and Earth Science, University of Hull, Cottingham Road, Hull, United Kingdom; Geology Department, Western Washington University, Bellingham, WA, United States
Recommended Citation:
Egan J.,Fletcher W.J.,Allott T.E.H.,et al. The impact and significance of tephra deposition on a Holocene forest environment in the North Cascades, Washington, USA[J]. Quaternary Science Reviews,2016-01-01,137