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Allometric Equations for Estimating Compartment Biomass and Stem Volume in Mature Hybrid Poplars: General or Site-Specific?

1
Fiducie de Recherche sur la Forêt des Cantons-de-l’Est/Eastern Townships Forest Research Trust, 1 rue Principale, Saint-Benoît-du-Lac, QC J0B 2M0, Canada
2
Department of Biology, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
*
Author to whom correspondence should be addressed.
Received: 29 June 2017 / Revised: 9 August 2017 / Accepted: 21 August 2017 / Published: 24 August 2017
We evaluated the extent to which general or site-specific allometric equations, using diameter at breast height (DBH) as a predictor, are more accurate for estimating stem volume, stem biomass, branch biomass, aboveground woody biomass, and coarse root biomass in 14 year-old plantations of Populus canadensis × Populus maximowiczii (clone DN × M-915508) located along an environmental gradient in southern Québec (eastern Canada). The effect of tree size and site on stem wood basic density, moisture content, and proportion of branch biomass was also evaluated. For stem volume, stem biomass, and aboveground biomass, site-specific and general models had comparable fit and accuracy, but lower Akaike’s Information Criterion (AICc) values were observed for the general models. For the branch and coarse root biomass, higher fit and accuracy and lower AICc values were observed for the site-specific models. Allometric trajectory changes (plastic allometry) across sites were mainly observed for coarse root biomass, branch biomass, and stem volume. On the low fertility site, allocation was increased to coarse roots and decreased to stem volume. Site-specific tradeoffs between tree architecture and stem wood density explained the relatively invariant allometry for the whole aboveground woody biomass across the plantation sites. On the high fertility sites, basic wood density was the lowest and declined as tree DBH increased. At all sites, stem wood moisture content and the proportion of branch biomass increased with DBH. Overall, this study showed that biomass allometry, tree architecture, and biomass quality are a function of both tree size and plantation environment in hybrid poplar. Allometric model selection (site-specific or general) should depend on the objective pursued (evaluation of yield, nutrient budget, carbon stocks). View Full-Text
Keywords: carbon partitioning; coarse roots; branches; aboveground and belowground biomass; wood basic density; wood moisture content; plasticity; allocation; site fertility; tree architecture carbon partitioning; coarse roots; branches; aboveground and belowground biomass; wood basic density; wood moisture content; plasticity; allocation; site fertility; tree architecture
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MDPI and ACS Style

Fortier, J.; Truax, B.; Gagnon, D.; Lambert, F. Allometric Equations for Estimating Compartment Biomass and Stem Volume in Mature Hybrid Poplars: General or Site-Specific? Forests 2017, 8, 309. https://0-doi-org.brum.beds.ac.uk/10.3390/f8090309

AMA Style

Fortier J, Truax B, Gagnon D, Lambert F. Allometric Equations for Estimating Compartment Biomass and Stem Volume in Mature Hybrid Poplars: General or Site-Specific? Forests. 2017; 8(9):309. https://0-doi-org.brum.beds.ac.uk/10.3390/f8090309

Chicago/Turabian Style

Fortier, Julien, Benoit Truax, Daniel Gagnon, and France Lambert. 2017. "Allometric Equations for Estimating Compartment Biomass and Stem Volume in Mature Hybrid Poplars: General or Site-Specific?" Forests 8, no. 9: 309. https://0-doi-org.brum.beds.ac.uk/10.3390/f8090309

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