Root System Architecture of Salix miyabeana “SX67” and Relationships with Aboveground Biomass Yields [r-libre/2196]

Fontana, Mario; Collin, Alexandre; Couchesne, Francois; Labrecque, Michel et Bélanger, Nicolas (2020). Root System Architecture of Salix miyabeana “SX67” and Relationships with Aboveground Biomass Yields. Bioenergy Research, 13 (1), 183-196. https://doi.org/10.1007/s12155-019-10062-1

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Catégorie de document :	Articles de revues
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Résumé :	This study focused on relationships between soil properties, root architecture, and aboveground biomass productivity of Salix miyabeana “SX67”. Roots were excavated at eight short-rotation cultures with contrasted soil/climatic conditions and root system ages from 4 to 14 years. The depth of the root branching points to the initial cuttings, root diameters, and root branching occurrence as well as soil physico-chemical properties were measured. Aboveground biomass had been estimated in a previous study, which allowed to calculate a proxy of root-to-shoot ratio. Root system ages and belowground biomass were related (adj. R2 = 0.88, p < 0.001). However, biomass partitioning in the different tree components was mainly governed by soil properties. Sand content was related to root-to-shoot ratio (adj. R2=0.73, p < 0.01) and the proportion of coarse roots (diameter > 1 cm) deeper than 10 cm (adj. R2 = 0.75, p < 0.01), whereas clay content was related to root branching occurrence-to-aboveground productivity ratio (adj. R2 = 0.80, p < 0.01). Coarse root depth distribution was related to aboveground biomass following a quadratic model that suggested (i) a maximal aboveground biomass productivity when a third of the roots were deeper than 10 cm and (ii) two opposite strategies of biomass allocation, i.e., biomass was allocated “downward” with a higher proportion of deeper roots and root-to-shoot ratio at sites with coarser soils and “upward” with a lower proportion of deeper roots and root-to-shoot ratio at sites with clayey/compacted soils. The study highlights how root plasticity of “SX67” copes with different soil stresses to maintain high aboveground biomass productivity.
Adresse de la version officielle :	https://link.springer.com/article/10.1007/s12155-0...
Déposant:	Bélanger, Nicolas
Responsable :	Nicolas Bélanger
Dépôt :	10 févr. 2021 15:12
Dernière modification :	10 févr. 2021 15:12

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