Generalized Allometric Regression to Estimate Biomass of Populus in Short-rotation Coppice

Brahim, Mohammed Ben; Gavaland, André; Cabanettes, Alain

doi:10.1080/028275800750014975

Cited by 14 publications

(3 citation statements)

References 14 publications

(16 reference statements)

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“…The precision of such allometric equations is generally sufficient for stem biomass components [254]. However, other examples of equations exist that include more predictive variables in the models, which can improve the precision of the estimations [11,47,205,[255][256][257][258]. Although specific genotype-level models provide the greatest precision, in cases where genotype identification is complicated, models for genotypes which are taxonomically close or taxonomic-specific models are often used.…”

Section: Productionmentioning

confidence: 99%

Poplar Short Rotation Coppice Plantations under Mediterranean Conditions: The Case of Spain

Oliveira

Pérez-Cruzado

Cañellas

et al. 2020

Forests

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Developing a circular bioeconomy based on the sustainable use of biological resources, such as biomass, seems to be the best way of responding to the challenges associated with global change. Among the many sources, short rotation forest crops are an essential instrument for obtaining quality biomass with a predictable periodicity and yield, according to the areas of cultivation. This review aims to provide an overview of available knowledge on short rotation coppice Populus spp. plantations under Mediterranean conditions and specifically in Spain, in order to identify not only the status, but also the future prospects, for this type of biomass production. The analysis of available information was conducted by taking into consideration the following aspects: Genetic plant material; plantation design, including densities, rotation lengths and the number of rotations, and mixtures; management activities, including irrigation, fertilization, and weed control; yield prediction; biomass characterization; and finally, an evaluation of the sustainability of the plantation and ecosystem services provided. Despite advances, there is still much to be done if these plantations are to become a commercial reality in some Mediterranean areas. To achieve this aim, different aspects need to be reconsidered, such as irrigation, bearing in mind that water restrictions represent a real threat; the specific adaptation of genetic material to these conditions, in order to obtain a greater efficiency in resource use, as well as a greater resistance to pests and diseases or tolerance to abiotic stresses such as drought and salinity; rationalizing fertilization; quantifying and valuing the ecosystem services; the advance of more reliable predictive models based on ecophysiology; the specific characterization of biomass for its final use (bioenergy/bioproducts); technological improvements in management and harvesting; and finally, improving the critical aspects detected in environmental, energy, and economic analyses to achieve profitable and sustainable plantations under Mediterranean conditions.

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Section: Productionmentioning

confidence: 99%

Poplar Short Rotation Coppice Plantations under Mediterranean Conditions: The Case of Spain

Oliveira

Pérez-Cruzado

Cañellas

et al. 2020

Forests

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“…In other studies, many biomass or volume equations for hybrid poplar have been developed with additional predictor variables (e.g., tree height and/or planting density) used in combination with tree DBH [10,57,65]. However, the use of those additional predictor variables was not considered in this study, as it is not supported by the allometry theory, and because tree height and planting density were strongly correlated with DBH (for tree height r = 0.82, p < 0.001; for planting density, r = −0.64, p < 0.001).…”

Section: Allometric Equationsmentioning

confidence: 99%

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

Fortier¹,

Truax²,

Gagnon³

2017

Forests

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Abstract: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).

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“…Most of the biomass models for these plantations are site and genotype-specific models [18,19], and therefore their applicability is limited [20]. However, there are also examples of models developed for higher hierarchical levels [21][22][23]. In fact, the use of statistical models based on a wide range of empirical data has become more frequent due to the difficulty involved in extrapolating specific values to greater scales, given the wide variability in production [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Terrestrial Laser Scanning for Non-Destructive Estimation of Aboveground Biomass in Short-Rotation Poplar Coppices

et al. 2023

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Poplar plantations in high-density and short-rotation coppices (SRC) are a suitable way for the fast production of wood that can be transformed into bioproducts or bioenergy. Optimal management of these coppices requires accurate assessment of the total standing biomass. However, traditional field inventory is a challenging task, given the existence of multiple shoots, the difficulty of identifying terminal shoots, and the extreme high density. As an alternative, in this work, we propose to develop individual stool and plot biomass models using metrics derived from terrestrial laser scanning (TLS) as predictors. To this aim, we used data from a SRC poplar plantation, including nine plots and 154 individual stools. Every plot was scanned from different positions, and individual stools were felled, weighed, and dried to compute aboveground biomass (AGB). Individual stools were segmented from the cloud point, and different TLS metrics at stool and plot level were derived following processes of bounding box, slicing, and voxelization. These metrics were then used, either alone or combined with field-measured metrics, to fit biomass models. Our results indicate that at individual-stool level, the biomass models combining TLS metrics and easy to measure in field metrics (stool diameter) perform similarly to the traditional allometric models based on field inventories, while at plot scales, TLS-derived models show superiority over traditional models. Our proposed methodology permits accurate and non-destructive estimates of the biomass fixed in SRC plantations.

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Generalized Allometric Regression to Estimate Biomass of Populus in Short-rotation Coppice

Cited by 14 publications

References 14 publications

Poplar Short Rotation Coppice Plantations under Mediterranean Conditions: The Case of Spain

Poplar Short Rotation Coppice Plantations under Mediterranean Conditions: The Case of Spain

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

Terrestrial Laser Scanning for Non-Destructive Estimation of Aboveground Biomass in Short-Rotation Poplar Coppices

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