SimardElhaniMorinEtAl2008

Référence

Simard, S., Elhani, S., Morin, H., Krause, C., Cherubini, P. (2008) Carbon and oxygen stable isotopes from tree-rings to identify spruce budworm outbreaks in the boreal forest of Québec. Chemical Geology, 252(1-2):80-87. (URL )

Résumé

The aim of this study was to test the potential of carbon ([delta]13C) and oxygen ([delta]18O) isotopes as indicators of spruce budworm outbreaks. It was hypothesized that defoliation induced by insects would trigger a 13C enrichment of Abies balsamea and Picea mariana tree-ring [alpha]-cellulose through higher photosynthetic compensatory rate, while [delta]18O would remain constant. The hypothesis was based on observations of increased photosynthetic rate induced by defoliation, as a compensatory mechanism ([Little, C.H.A., Lavigne, M.B., Ostaff, D.P., 2003. Impact of old foliage removal, simulating defoliation by the balsam fir sawfly, on balsam fir tree growth and photosynthesis of current-year shoots. For. Ecol. Manag. 186, 261-269], [Lavigne, M.B., Little, C.H.A., Major, J.E., 2001. Increasing the sink:source balance enhances photosynthetic rate of 1-year-old balsam fir foliage by increasing allocation of mineral nutrients. Tree Physiol. 21, 417-426]). Comparison of the two host species, A. balsamea and P. mariana with a non-host one, Pinus banksiana, revealed carbon isotope enrichments during both the 1950s and 1970s spruce budworm outbreaks which did not occur in the non-host species. Carbon and oxygen isotope values showed high synchronicity not only within species but also between species (A. balsamea and P. mariana) and sites. P. banksiana [delta]18O values were also highly synchronous with those of the two other coniferous species. The comparison of host and non-host ring width, [delta]13C and [delta]18O chronologies confirmed the potential of combining these isotope indicators of spruce budworm outbreaks.

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@ARTICLE { SimardElhaniMorinEtAl2008,
    AUTHOR = { Simard, S. and Elhani, S. and Morin, H. and Krause, C. and Cherubini, P. },
    TITLE = { Carbon and oxygen stable isotopes from tree-rings to identify spruce budworm outbreaks in the boreal forest of Québec },
    JOURNAL = { Chemical Geology },
    YEAR = { 2008 },
    VOLUME = { 252 },
    PAGES = { 80-87 },
    NUMBER = { 1-2 },
    MONTH = { jun },
    ABSTRACT = { The aim of this study was to test the potential of carbon ([delta]13C) and oxygen ([delta]18O) isotopes as indicators of spruce budworm outbreaks. It was hypothesized that defoliation induced by insects would trigger a 13C enrichment of Abies balsamea and Picea mariana tree-ring [alpha]-cellulose through higher photosynthetic compensatory rate, while [delta]18O would remain constant. The hypothesis was based on observations of increased photosynthetic rate induced by defoliation, as a compensatory mechanism ([Little, C.H.A., Lavigne, M.B., Ostaff, D.P., 2003. Impact of old foliage removal, simulating defoliation by the balsam fir sawfly, on balsam fir tree growth and photosynthesis of current-year shoots. For. Ecol. Manag. 186, 261-269], [Lavigne, M.B., Little, C.H.A., Major, J.E., 2001. Increasing the sink:source balance enhances photosynthetic rate of 1-year-old balsam fir foliage by increasing allocation of mineral nutrients. Tree Physiol. 21, 417-426]). Comparison of the two host species, A. balsamea and P. mariana with a non-host one, Pinus banksiana, revealed carbon isotope enrichments during both the 1950s and 1970s spruce budworm outbreaks which did not occur in the non-host species. Carbon and oxygen isotope values showed high synchronicity not only within species but also between species (A. balsamea and P. mariana) and sites. P. banksiana [delta]18O values were also highly synchronous with those of the two other coniferous species. The comparison of host and non-host ring width, [delta]13C and [delta]18O chronologies confirmed the potential of combining these isotope indicators of spruce budworm outbreaks. },
    BOOKTITLE = { Stable Isotope Analysis of Tree Rings },
    KEYWORDS = { Abies balsamea, Spruce budworm outbreaks, Defoliation, Stable isotopes },
    OWNER = { brugerolles },
    TIMESTAMP = { 2008.06.16 },
    URL = { http://www.sciencedirect.com/science/article/B6V5Y-4RV17P1-4/1/490a74204c902b6dad65fdbe937811f8 },
}

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