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Afforestation of boreal open woodlands : early performance and ecophysiology of planted black spruce seedlings

Tremblay Pascal, Boucher Jean-François, Tremblay Marc et Lord Daniel. (2013). Afforestation of boreal open woodlands : early performance and ecophysiology of planted black spruce seedlings. Forests, 4, (2), p. 433-454.

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URL officielle: http://dx.doi.org/doi:10.3390/f4020433

Résumé

Open lichen woodlands (LWs) are degraded stands that lack the ability to regenerate naturally due to a succession of natural and/or anthropogenic disturbances. As they represent both interesting forest restoration and carbon sequestration opportunities, we tested disc scarification and planting of two sizes of containerized black spruce (Picea mariana Mill. (BSP)) seedlings for their afforestation. We compared treatment of unproductive LWs to reforestation of harvested, closed-crown black spruce-feathermoss (BSFM) stands. After one year, seedling survival and nutritional status were equivalent among stand types but despite higher root elongation index (REI), planted seedlings in LWs had lower relative growth rate, smaller total biomass and stem diameter than those in BSFM stands. Soil fertility variables, soil temperature, nor seedling water potential, helped at explaining this early growth response. Disc scarification significantly improved seedling first-year survival, biomass and foliar nutrient concentrations of P, Ca, and Mg. Smaller planting stock showed higher REI, higher shoot water potential, and higher foliar nutrient concentration of all but one of the measured nutrients (N, P, K and Mg). Hence, preliminary results suggest that planting of smaller containerized black spruce stock, combined with disc scarification, shows potential for afforestation of unproductive LWs. The impact of the lichen mat and other potential growth limiting factors on afforestation of these sites requires further investigation.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:4
Numéro:2
Pages:p. 433-454
Version évaluée par les pairs:Oui
Date:2013
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Afforestation, black spruce, Picea mariana, lichen woodland, growth limitation, ecophysiology, carbon sequestration
Déposé le:10 nov. 2015 01:17
Dernière modification:05 déc. 2016 21:06
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