CarcailletBlarquez2017

Référence

Carcaillet, C. and Blarquez, O. (2017) Fire ecology of a tree glacial refugium on a nunatak with a view on Alpine glaciers. New Phytologist, 216(4):1281-1290. (Scopus )

Résumé

In paleoecology, the function of biomass as a fire driver has become a focus of attention in cold ecosystems, and concerns have been raised about climate in this context. Little is known about the fire frequency and fire–plant relationships during glaciation when woodlands were limited and the climate was cold. Fire history and tree biomass were reconstructed from sedimentary charcoal and macroremains, respectively, archived in lake sediments from the western Alps. Two nunataks were investigated, both with lacustrine sediments covering the last 21 000 yr at least. During the Last Glacial Maximum (LGM) and the Lateglacial, fires occurred only on the nunatak sheltering woody plants. Cembra pine (Pinus cembra) and larch (Larix decidua) survived above glaciers during the LGM, thus evidencing a biological refugium and supporting the nunatak theory. We highlighted a long-term relationship between fires and dominant trees over the last 21 000 yr, where fire frequencies track the global climate and the local changes in tree biomass. Glacial climate (dry, cold) does not rule out fires. Fuel load and composition were significant fire drivers, with cembra pine dominating during colder periods with rare fires, and larch during the warmer Holocene with frequent fires. These findings increase knowledge of fire ecology in cold environments, and open perspectives in tree population genetics by considering new areas of tree glacial refugia in Europe. © 2017 The Authors. New Phytologist © 2017 New Phytologist Trust

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@ARTICLE { CarcailletBlarquez2017,
    AUTHOR = { Carcaillet, C. and Blarquez, O. },
    TITLE = { Fire ecology of a tree glacial refugium on a nunatak with a view on Alpine glaciers },
    JOURNAL = { New Phytologist },
    YEAR = { 2017 },
    VOLUME = { 216 },
    NUMBER = { 4 },
    PAGES = { 1281-1290 },
    NOTE = { cited By 1 },
    ABSTRACT = { In paleoecology, the function of biomass as a fire driver has become a focus of attention in cold ecosystems, and concerns have been raised about climate in this context. Little is known about the fire frequency and fire–plant relationships during glaciation when woodlands were limited and the climate was cold. Fire history and tree biomass were reconstructed from sedimentary charcoal and macroremains, respectively, archived in lake sediments from the western Alps. Two nunataks were investigated, both with lacustrine sediments covering the last 21 000 yr at least. During the Last Glacial Maximum (LGM) and the Lateglacial, fires occurred only on the nunatak sheltering woody plants. Cembra pine (Pinus cembra) and larch (Larix decidua) survived above glaciers during the LGM, thus evidencing a biological refugium and supporting the nunatak theory. We highlighted a long-term relationship between fires and dominant trees over the last 21 000 yr, where fire frequencies track the global climate and the local changes in tree biomass. Glacial climate (dry, cold) does not rule out fires. Fuel load and composition were significant fire drivers, with cembra pine dominating during colder periods with rare fires, and larch during the warmer Holocene with frequent fires. These findings increase knowledge of fire ecology in cold environments, and open perspectives in tree population genetics by considering new areas of tree glacial refugia in Europe. © 2017 The Authors. New Phytologist © 2017 New Phytologist Trust },
    AFFILIATION = { PSL Research University Paris, Ecole Pratique des Hautes Etudes, 4-14 rue Ferrus, Paris, France; Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (UMR5023 CNRS), Université Lyon 1, Villeurbanne Cedex, France; LTER Zone Atelier Alpes, Grenoble, France; International Associated Laboratory (LIA France-Canada MONTABOR), Montpellier, France; Département de Géographie, Université de Montréal, C.P. 6128 Succ. Centre Ville, Montréal, QC, Canada },
    AUTHOR_KEYWORDS = { climate change; European Alps; fire frequency; glacial refugium; paleoecology; tree biomass; vegetation dynamics },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/nph.14721 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85033215616&doi=10.1111%2fnph.14721&partnerID=40&md5=55cd0a5e9b16aaadfe62360eaf9cb7f9 },
}

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