SalomonTarrouxDesRochers2016

Référence

Salomon, R.L., Tarroux, E., DesRochers, A. (2016) Natural root grafting in Picea mariana to cope with spruce budworm outbreaks. Canadian Journal of Forest Research, 46(8):1059-1066. (Scopus )

Résumé

Spruce budworm (Choristoneura fumiferana Clem.) outbreaks cause extensive mortality and growth reductions throughout boreal forests in eastern North America. As tree vulnerability to defoliation remains partially unexplained by tree and stand attributes, we hypothesized that root grafting might attenuate the negative impact of severe defoliation in tree growth. Two experimental sites in the Abitibi-Témiscamingue region dominated by black spruce (Picea mariana Mill.) were harvested and hydraulically excavated to study tree growth in 36 trees in relation to root grafting and the last spruce budworm outbreak using dendroecological methods. Root grafts reduced the negative effects of defoliation by maintaining stable growth in connected trees during epidemic periods. Among dominant trees, growth releases immediately after the outbreak were uniquely observed in grafted trees. Among suppressed trees, grafted trees tended to grow more than non-grafted trees when defoliation severity was the highest. Carbohydrate transfers through root grafts and enhanced efficiency to acquire resources may explain the better performance of grafted trees under scenarios of limited carbon supply. This study reinforces the growing body of literature that suggests root grafting as a cooperative strategy to withstand severe disturbances and highlights the key role of root grafting in stand dynamics to cope with periodic outbreaks. © 2016, Canadian Science Publishing. All rights reserved.

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@ARTICLE { SalomonTarrouxDesRochers2016,
    AUTHOR = { Salomon, R.L. and Tarroux, E. and DesRochers, A. },
    TITLE = { Natural root grafting in Picea mariana to cope with spruce budworm outbreaks },
    JOURNAL = { Canadian Journal of Forest Research },
    YEAR = { 2016 },
    VOLUME = { 46 },
    NUMBER = { 8 },
    PAGES = { 1059-1066 },
    NOTE = { cited By 0 },
    ABSTRACT = { Spruce budworm (Choristoneura fumiferana Clem.) outbreaks cause extensive mortality and growth reductions throughout boreal forests in eastern North America. As tree vulnerability to defoliation remains partially unexplained by tree and stand attributes, we hypothesized that root grafting might attenuate the negative impact of severe defoliation in tree growth. Two experimental sites in the Abitibi-Témiscamingue region dominated by black spruce (Picea mariana Mill.) were harvested and hydraulically excavated to study tree growth in 36 trees in relation to root grafting and the last spruce budworm outbreak using dendroecological methods. Root grafts reduced the negative effects of defoliation by maintaining stable growth in connected trees during epidemic periods. Among dominant trees, growth releases immediately after the outbreak were uniquely observed in grafted trees. Among suppressed trees, grafted trees tended to grow more than non-grafted trees when defoliation severity was the highest. Carbohydrate transfers through root grafts and enhanced efficiency to acquire resources may explain the better performance of grafted trees under scenarios of limited carbon supply. This study reinforces the growing body of literature that suggests root grafting as a cooperative strategy to withstand severe disturbances and highlights the key role of root grafting in stand dynamics to cope with periodic outbreaks. © 2016, Canadian Science Publishing. All rights reserved. },
    AUTHOR_KEYWORDS = { Black spruce (Picea mariana); Dendrochronology; Insect defoliation; Root graft; Tree growth },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1139/cjfr-2016-0121 },
    KEYWORDS = { Carbon, Black spruce (Picea mariana); Choristoneura fumiferana; Cooperative strategy; Dendrochronology; Eastern north america; Enhanced efficiency; Insect defoliation; Tree growth, Forestry, boreal forest; carbohydrate; coniferous tree; defoliation; dendrochronology; dendroecology; experimental study; grafting; growth rate; harvesting; literature review; mortality; moth; population outbreak; root system; stand dynamics; vulnerability, Abitibi; Canada; Quebec [Canada]; Temiscamingue, Choristoneura fumiferana; Hexapoda; Picea mariana },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84982868451&partnerID=40&md5=70b96c37c91b317b58c7103acaf61e86 },
}

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