DOI: 10.1016/j.quascirev.2013.01.015
Scopus记录号: 2-s2.0-84874777613
论文题名: The impact of high tephra loading on late-Holocene carbon accumulation and vegetation succession in peatland communities
作者: Hughes P.D.M. ; Mallon G. ; Brown A. ; Essex H.J. ; Stanford J.D. ; Hotes S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 67 起始页码: 160
结束页码: 175
语种: 英语
英文关键词: Bog
; Carbon accumulation
; Hokkaido
; Holocene
; Japan
; Plant macrofossils
; Tephra
; Testate amoebae
Scopus关键词: Bog
; Carbon accumulation
; Hokkaido
; Holocenes
; Japan
; Plant macrofossils
; Tephra
; Testate amoebae
; Bayesian networks
; Carbon
; Vegetation
; Volcanoes
; Wetlands
; Loading
; bioaccumulation
; bog
; carbon cycle
; carbon sequestration
; community structure
; fossil record
; global climate
; Holocene
; humification
; mire
; monocotyledon
; moss
; nutrient cycling
; organic matter
; peatland
; succession
; tephra
; vegetation structure
; Hokkaido
; Japan
英文摘要: Peatlands are major terrestrial stores of carbon (C) of importance to the global climate system. Recent studies have made progress in understanding the climatic controls on the C cycle; however, important interactions between volcanic deposition and peatland C stores remain to be addressed. This study uses a 3000-year peatland record from northern Japan to examine the interactions between carbon accumulation, vegetation community succession and volcanic ash deposition. Plant macrofossil and testate amoebae records are presented alongside records of total organic carbon, nitrogen and phosphorous. Age-depth models are developed using a Bayesian approach, with seven AMS radiocarbon dates and two identified historical tephras from Baitoushan (AD 969 (981 cal. BP)), and Hokkaido-Komagatake (AD 1640 (310 cal. BP)) volcanoes. Results show that moderate to high tephra loading can shift peatland plant communities from Sphagnum to monocotyledon domination. This vegetation change is associated with increased peat humification and reduced carbon accumulation. Where tephra deposition and reworking has occurred, the apparent rate of carbon accumulation can be halved while high tephra loading of the mire surface is sustained. Sphagnum species vary in their tolerance to tephra deposition. After each ash fall Sphagnum magellanicum disappeared from the plant macrofossil record, whereas Sphagnum papillosum showed apparent continuity of development through the 1856 (94 cal. BP) Ko-c1 tephra. High rates of carbon accumulation (peaking at >100 g m-2 yr-1), 2-3 times faster than the average for northern peatlands, were recorded in the Sphagnum communities that established after the cessation of tephra deposition and reworking from the AD 969 Baitoushan ash fall (B-Tm tephra). This peak in C accumulation was coincident with a radical shift in mire nutrient cycling most probably caused by the interaction of S. magellanicum with leachates from the underlying tephras. The phase of high C accumulation continued for over 300 years, offsetting the initial negative impact of the B-Tm tephra on peatland C accumulation. These results suggest that management for ash-tolerant Sphagnum species could be a highly effective strategy for minimising volcanic disruption to peatland carbon accumulation. The study also shows that consideration of volcanic impacts on peatlands is essential for development of more realistic terrestrial carbon balance models in volcanically active regions. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60667
Appears in Collections: 过去全球变化的重建
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作者单位: Palaeoecology Laboratory (PLUS), Geography and Environment, University of Southampton, Highfield, Southampton, Hampshire SO17 1BJ, United Kingdom; Department of Geography, Swansea University, Wallace Building, Singleton Park, Swansea SA2 8PP, United Kingdom; Philipps-University, Faculty of Biology, Department of Ecology, Karl-v.-Frisch-Str. 8, 35043 Marburg, Germany
Recommended Citation:
Hughes P.D.M.,Mallon G.,Brown A.,et al. The impact of high tephra loading on late-Holocene carbon accumulation and vegetation succession in peatland communities[J]. Quaternary Science Reviews,2013-01-01,67