DOI: 10.1111/gcb.14947
论文题名: Moisture-driven shift in the climate sensitivity of white spruce xylem anatomical traits is coupled to large-scale oscillation patterns across northern treeline in northwest North America
作者: Lange J. ; Carrer M. ; Pisaric M.F.J. ; Porter T.J. ; Seo J.-W. ; Trouillier M. ; Wilmking M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 3 语种: 英语
英文关键词: boreal forest
; climate change
; divergence
; drought
; pacific decadal oscillation
; Picea glauca
; plasticity
; tree-ring width
; wood anatomy
Scopus关键词: anatomy
; boreal forest
; climate change
; divergence
; drought
; growth response
; moisture
; Pacific Decadal Oscillation
; physiological response
; plasticity
; treeline
; wood
; xylem
; North America
; Picea glauca
英文摘要: Tree growth at northern treelines is generally temperature-limited due to cold and short growing seasons. However, temperature-induced drought stress was repeatedly reported for certain regions of the boreal forest in northwestern North America, provoked by a significant increase in temperature and possibly reinforced by a regime shift of the pacific decadal oscillation (PDO). The aim of this study is to better understand physiological growth reactions of white spruce, a dominant species of the North American boreal forest, to PDO regime shifts using quantitative wood anatomy and traditional tree-ring width (TRW) analysis. We investigated white spruce growth at latitudinal treeline across a >1,000 km gradient in northwestern North America. Functionally important xylem anatomical traits (lumen area, cell-wall thickness, cell number) and TRW were correlated with the drought-sensitive standardized precipitation–evapotranspiration index of the growing season. Correlations were computed separately for complete phases of the PDO in the 20th century, representing alternating warm/dry (1925–1946), cool/wet (1947–1976) and again warm/dry (1977–1998) climate regimes. Xylem anatomical traits revealed water-limiting conditions in both warm/dry PDO regimes, while no or spatially contrasting associations were found for the cool/wet regime, indicating a moisture-driven shift in growth-limiting factors between PDO periods. TRW reflected only the last shift of 1976/1977, suggesting different climate thresholds and a higher sensitivity to moisture availability of xylem anatomical traits compared to TRW. This high sensitivity of xylem anatomical traits permits to identify first signs of moisture-driven growth in treeline white spruce at an early stage, suggesting quantitative wood anatomy being a powerful tool to study climate change effects in the northwestern North American treeline ecotone. Projected temperature increase might challenge growth performance of white spruce as a key component of the North American boreal forest biome in the future, when drier conditions are likely to occur with higher frequency and intensity. © 2019 The Authors. Global Change Biology published by John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158944
Appears in Collections: 气候变化与战略
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作者单位: Institute of Botany and Landscape Ecology, University of Greifswald, Greifswald, Germany; Department TESAF, University of Padova, Padova, Italy; Department of Geography and Tourism Studies, Brock University, Saint Catharines, ON, Canada; Department of Geography, University of Toronto Mississauga, Mississauga, ON, Canada; Department of Wood & Paper Science, Chungbuk National University, Cheongju, South Korea
Recommended Citation:
Lange J.,Carrer M.,Pisaric M.F.J.,et al. Moisture-driven shift in the climate sensitivity of white spruce xylem anatomical traits is coupled to large-scale oscillation patterns across northern treeline in northwest North America[J]. Global Change Biology,2020-01-01,26(3)