LegareBergeronPare2005

Référence

Legare, S., Bergeron, Y. and Pare, D. (2005) Effect of aspen (Populus tremuloides) as a companion species on thegrowth of black spruce (Picea mariana) in the southwestern borealforest of Quebec. Forest Ecology and Management, 208(1-3):211-222.

Résumé

In the western boreal forest of Quebec, black spruce stand productivityis approximately 1 m3/ha/year. The low productivity of these standsis often attributed to the paludification process, which is sustainedby low quality black spruce litter and the influence of black spruceon soil moisture. In contrast, aspen hasten nutrient cycling, suggestingthat the presence of aspen in black spruce-dominated stands couldoffset the effect of black spruce on soil processes and positivelyaffect stand productivity. We hypothesised that aspen in black spruce-dominatedstands could: (1) increase black spruce DBH, height and volume perstem, (2) increase black spruce productivity without affecting blackspruce volume in the stand, and (3) increase total stand volume.In 2001, twelve 14 m diameter plots were sampled for DBH and heightof every stem on three black spruce-dominated sites containing variousproportions of aspen. Using stem analysis, the time to grow froma height of 5 m to a height of 10 m was determined on three dominantblack spruces in each plot. Statistical analyses revealed that DBH,height and volume per black spruce stem were not affected by aspen.However, total black spruce volume decreased with increasing aspenbasal area in sites 2 and 3, suggesting that the presence of aspenreduced black spruce density. In site 1, black spruce volume wasnot affected by aspen, indicating, for total stand productivity,a net gain in aspen fibre. Along a gradient of increasing aspenbasal area, the time to grow 5 m decreased in sites 1 and 3. Theseresults suggest that the presence of aspen influences black spruceproductivity, although this influence is site-specific and couldbe dependent on the proportion of aspen, its hierarchical positionin the canopy, and the nutrient status of the site. To some extent,this could explain the absence of a general trend concerning mixedstand productivity. © 2004 Elsevier B.V. All rights reserved.

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@ARTICLE { LegareBergeronPare2005,
    AUTHOR = { Legare, S. and Bergeron, Y. and Pare, D. },
    TITLE = { Effect of aspen (Populus tremuloides) as a companion species on thegrowth of black spruce (Picea mariana) in the southwestern borealforest of Quebec },
    JOURNAL = { Forest Ecology and Management },
    YEAR = { 2005 },
    VOLUME = { 208 },
    PAGES = { 211-222 },
    NUMBER = { 1-3 },
    ABSTRACT = { In the western boreal forest of Quebec, black spruce stand productivityis approximately 1 m3/ha/year. The low productivity of these standsis often attributed to the paludification process, which is sustainedby low quality black spruce litter and the influence of black spruceon soil moisture. In contrast, aspen hasten nutrient cycling, suggestingthat the presence of aspen in black spruce-dominated stands couldoffset the effect of black spruce on soil processes and positivelyaffect stand productivity. We hypothesised that aspen in black spruce-dominatedstands could: (1) increase black spruce DBH, height and volume perstem, (2) increase black spruce productivity without affecting blackspruce volume in the stand, and (3) increase total stand volume.In 2001, twelve 14 m diameter plots were sampled for DBH and heightof every stem on three black spruce-dominated sites containing variousproportions of aspen. Using stem analysis, the time to grow froma height of 5 m to a height of 10 m was determined on three dominantblack spruces in each plot. Statistical analyses revealed that DBH,height and volume per black spruce stem were not affected by aspen.However, total black spruce volume decreased with increasing aspenbasal area in sites 2 and 3, suggesting that the presence of aspenreduced black spruce density. In site 1, black spruce volume wasnot affected by aspen, indicating, for total stand productivity,a net gain in aspen fibre. Along a gradient of increasing aspenbasal area, the time to grow 5 m decreased in sites 1 and 3. Theseresults suggest that the presence of aspen influences black spruceproductivity, although this influence is site-specific and couldbe dependent on the proportion of aspen, its hierarchical positionin the canopy, and the nutrient status of the site. To some extent,this could explain the absence of a general trend concerning mixedstand productivity. © 2004 Elsevier B.V. All rights reserved. },
    KEYWORDS = { Merchantable volume Mixed-species stands Picea mariana Populus tremuloidesProductivity Hierarchical systems Moisture Productivity Soils Statisticalmethods Boreal forests Paludification process Spruce density Spruceproductivity Forestry facilitation interspecific interaction mixedforest productivity silviculture Forestry Hierarchical Systems MoisturePicea Productivity Soil Statistical Analysis Canada North AmericaQuebec [Canada] Western Hemisphere World Picea mariana Populus tremuloides },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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