CavardBergeronChenEtAl2011b

Référence

Cavard, X., Bergeron, Y., Chen, H.Y., Pare, D. (2011) Effect of forest canopy composition on soil nutrients and dynamicsof the understorey: Mixed canopies serve neither vascular nor bryophytestrata. Journal of Vegetation Science, 22(6):1105-1119. (Scopus )

Résumé

Question: The effect of overstorey composition on above-ground dynamicsof understorey vegetation is poorly understood. This study examinesthe understorey biomass, production and turnover rates of vascularand non-vascular plants along a conifer-broadleaf gradient of resourceavailability and heterogeneity. Location: Canadian boreal forestsof northwest Quebec and Ontario. Methods: We sampled mature standscontaining various proportions of black spruce (Picea mariana (Mill.)BSP), trembling aspen (Populus tremuloides Michx.) and jack pine(Pinus banksiana Lamb.). Above-ground biomass of the understoreyvegetation was assessed through harvesting; annual growth rates werecalculated as the differences between biomass in 2007 and 2008, asestimated by allometric relationships, and turnover rates were estimatedas net primary production divided by the biomass in 2007. Results:Higher aspen presence, linked to greater nutrient availability inthe forest floor, was generally associated with higher vascular biomassand production in the understorey. This effect was less pronouncedin sites of high intrinsic fertility. In contrast, bryophyte biomasswas positively associated with conifer abundance, particularly inwet sites of the Quebec study area. Non-linear responses resultedin total understorey biomass being lower under mixed canopies thanunder pure aspen or pure conifer canopies. Turnover rates did notdiffer with overstorey composition. Conclusions: While resource availabilityis a main driver of understorey productivity, resources as driversappear to differ with differences in understorey strata components,i.e. vascular versus non-vascular plants. Resource heterogeneityinduced by a mixed canopy had overall negative effects on understoreyabove-ground productivity, as this productivity seemed to rely onspecies adapted to the specific conditions induced by a pure canopy.© 2011 International Association for Vegetation Science.

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@ARTICLE { CavardBergeronChenEtAl2011b,
    AUTHOR = { Cavard, X. and Bergeron, Y. and Chen, H.Y. and Pare, D. },
    TITLE = { Effect of forest canopy composition on soil nutrients and dynamicsof the understorey: Mixed canopies serve neither vascular nor bryophytestrata },
    JOURNAL = { Journal of Vegetation Science },
    YEAR = { 2011 },
    VOLUME = { 22 },
    PAGES = { 1105-1119 },
    NUMBER = { 6 },
    ABSTRACT = { Question: The effect of overstorey composition on above-ground dynamicsof understorey vegetation is poorly understood. This study examinesthe understorey biomass, production and turnover rates of vascularand non-vascular plants along a conifer-broadleaf gradient of resourceavailability and heterogeneity. Location: Canadian boreal forestsof northwest Quebec and Ontario. Methods: We sampled mature standscontaining various proportions of black spruce (Picea mariana (Mill.)BSP), trembling aspen (Populus tremuloides Michx.) and jack pine(Pinus banksiana Lamb.). Above-ground biomass of the understoreyvegetation was assessed through harvesting; annual growth rates werecalculated as the differences between biomass in 2007 and 2008, asestimated by allometric relationships, and turnover rates were estimatedas net primary production divided by the biomass in 2007. Results:Higher aspen presence, linked to greater nutrient availability inthe forest floor, was generally associated with higher vascular biomassand production in the understorey. This effect was less pronouncedin sites of high intrinsic fertility. In contrast, bryophyte biomasswas positively associated with conifer abundance, particularly inwet sites of the Quebec study area. Non-linear responses resultedin total understorey biomass being lower under mixed canopies thanunder pure aspen or pure conifer canopies. Turnover rates did notdiffer with overstorey composition. Conclusions: While resource availabilityis a main driver of understorey productivity, resources as driversappear to differ with differences in understorey strata components,i.e. vascular versus non-vascular plants. Resource heterogeneityinduced by a mixed canopy had overall negative effects on understoreyabove-ground productivity, as this productivity seemed to rely onspecies adapted to the specific conditions induced by a pure canopy.© 2011 International Association for Vegetation Science. },
    COMMENT = { doi: 10.1111/j.1654-1103.2011.01311.x },
    ISSN = { 11009233 (ISSN) },
    KEYWORDS = { Allometric relationships, Carbon dynamics, Mixed wood, Resource availability,Understorey productivity },
    OWNER = { Luc },
    TIMESTAMP = { 2011.10.20 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-80053569674&partnerID=40&md5=6d89149dcc3c820c18a71aa92eb86fde },
}

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