OlsKaalaasDrobyshevEtAl2019

Référence

Ols, C., Kålås, I.H., Drobyshev, I., Söderström, L., Hofgaard, A. (2019) Spatiotemporal variation in the relationship between boreal forest productivity proxies and climate data. Dendrochronologia, 58. (Scopus )

Résumé

The impacts of climate change on high-latitude forest ecosystems are still uncertain. Divergent forest productivity trends have recently been reported both at the local and regional level challenging the projections of boreal tree growth dynamics. The present study investigated (i) the responses of different forest productivity proxies to monthly climate (temperature and precipitation) through space and time; and (ii) the local coherency between these proxies through time at four high-latitude boreal Scots pine sites (coastal and inland) in Norway. Forest productivity proxies consisted of two proxies representing stem growth dynamics (radial and height growth) and one proxy representing canopy dynamics (cumulative May-to-September Normalized Difference Vegetation Index (NDVI)). Between-proxy and climate-proxy correlations were computed over the 1982–2011 period and over two 15-yr sub-periods. Over the entire period, radial growth significantly correlated with current year July temperature, and height growth and cumulative NDVI significantly correlated with previous and current growing season temperatures. Significant climate responses were quite similar across sites, despite some higher sensitivity to non-growing season climate at inland sites. Significant climate-proxy correlations identified over the entire period were temporarily unstable. Local coherency between proxies was generally insignificant. The spatiotemporal instability in climate-proxy correlations observed for all proxies underlines evolving responses to climate and challenges the modelling of forest productivity. The general lack of local coherency between proxies at our four study sites suggests that forest productivity estimations based on a single proxy should be considered with great caution. The combined use of different forest growth metrics may help circumvent uncertainties in capturing responses of forest productivity to climate variability and improve estimations of carbon sequestration by forest ecosystems. © 2019 Elsevier GmbH

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@ARTICLE { OlsKaalaasDrobyshevEtAl2019,
    AUTHOR = { Ols, C. and Kålås, I.H. and Drobyshev, I. and Söderström, L. and Hofgaard, A. },
    TITLE = { Spatiotemporal variation in the relationship between boreal forest productivity proxies and climate data },
    JOURNAL = { Dendrochronologia },
    YEAR = { 2019 },
    VOLUME = { 58 },
    NOTE = { cited By 0 },
    ABSTRACT = { The impacts of climate change on high-latitude forest ecosystems are still uncertain. Divergent forest productivity trends have recently been reported both at the local and regional level challenging the projections of boreal tree growth dynamics. The present study investigated (i) the responses of different forest productivity proxies to monthly climate (temperature and precipitation) through space and time; and (ii) the local coherency between these proxies through time at four high-latitude boreal Scots pine sites (coastal and inland) in Norway. Forest productivity proxies consisted of two proxies representing stem growth dynamics (radial and height growth) and one proxy representing canopy dynamics (cumulative May-to-September Normalized Difference Vegetation Index (NDVI)). Between-proxy and climate-proxy correlations were computed over the 1982–2011 period and over two 15-yr sub-periods. Over the entire period, radial growth significantly correlated with current year July temperature, and height growth and cumulative NDVI significantly correlated with previous and current growing season temperatures. Significant climate responses were quite similar across sites, despite some higher sensitivity to non-growing season climate at inland sites. Significant climate-proxy correlations identified over the entire period were temporarily unstable. Local coherency between proxies was generally insignificant. The spatiotemporal instability in climate-proxy correlations observed for all proxies underlines evolving responses to climate and challenges the modelling of forest productivity. The general lack of local coherency between proxies at our four study sites suggests that forest productivity estimations based on a single proxy should be considered with great caution. The combined use of different forest growth metrics may help circumvent uncertainties in capturing responses of forest productivity to climate variability and improve estimations of carbon sequestration by forest ecosystems. © 2019 Elsevier GmbH },
    AFFILIATION = { Canada Research Chair in Ecology and Sustainable Forest Management, Forest Research Institute, Université du Québec en Abitibi-Témiscamingue, 445 Boulevard de l'Université, Rouyn-Noranda, QC J9X5E4, Canada; Norwegian Institute for Nature Research, PO Box 5685 Torgarden, Trondheim, NO-7485, Norway; Department of Biology, Norwegian University of Science and Technology, Trondheim, NO-7491, Norway; Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre, Box 49, Alnarp, 230 53, Sweden; Institut National de l'Information Géographique et Forestière, Laboratoire d'Inventaire Forestier, 14 rue Girardet, Nancy, 54000, France; Faculty of Bioscience and Aquaculture, Nord University, Steinkjer, NO-7729, Norway },
    ART_NUMBER = { 125648 },
    AUTHOR_KEYWORDS = { Arctic amplification; Boreal ecosystems; Carbon sequestration; Dendroclimatology; Remote sensing; Vegetation productivity },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.dendro.2019.125648 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85074969378&doi=10.1016%2fj.dendro.2019.125648&partnerID=40&md5=d71afd67116562de9989bb5a73a4da33 },
}

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