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dc.contributor.authorLange, Jelena
dc.contributor.authorCarrer, Marco
dc.contributor.authorPisaric, Michael
dc.contributor.authorPorter, Trevor
dc.contributor.authorSeo, Jeong‐Wook
dc.contributor.authorTrouillier, Mario
dc.contributor.authorWilmking, Martin
dc.date.accessioned2019-12-23T14:17:52Z
dc.date.available2019-12-23T14:17:52Z
dc.date.issued2019-12-04
dc.identifier.citationLange, J., Carrer, M., Pisaric, M.F., Porter, T.J., Seo, J.‐W., Trouillier, M. and Wilmking, M. (2019), 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. Glob Change Biol. Accepted Author Manuscript. doi:10.1111/gcb.14947en_US
dc.identifier.issn1365-2486
dc.identifier.urihttp://hdl.handle.net/10464/14593
dc.description.abstractTree 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 analysis. We investigated white spruce growth at latitudinal treeline across a >1000 km gradient in northwestern North America. Functionally important xylem anatomical traits (lumen area, cellwall thickness, cell number) and tree-ring width were correlated with the drought-sensitive standardized precipitation-evapotranspiration index (SPEI) 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 moisturedriven shift in growth-limiting factors between PDO periods. Tree-ring width reflected only the last shift of 1976/77, suggesting different climate thresholds and a higher sensitivity to moisture availability of xylem anatomical traits compared to tree-ring width. 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.en_US
dc.language.isoenen_US
dc.publisherWileyen_US
dc.subjectPicea glaucaen_US
dc.subjectboreal foresten_US
dc.subjectwood anatomyen_US
dc.subjecttree-ring widthen_US
dc.subjectdroughten_US
dc.subjectpacific decadal oscillationen_US
dc.subjectdivergenceen_US
dc.subjectclimate changeen_US
dc.subjectplasticityen_US
dc.titleMoisture‐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 Americaen_US
dc.typeArticleen_US
dc.identifier.doi10.1111/gcb.14947
refterms.dateFOA2020-12-12T00:00:00Z


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