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Root system architecture of Salix miyabeana ‘SX67’ and relationships with aboveground biomass yields [r-libre/1794]

Fontana, Mario; Collin, Alexandre; Courchesne, Francois; Labrecque, Michel, & Bélanger, Nicolas (2019). Root system architecture of Salix miyabeana ‘SX67’ and relationships with aboveground biomass yields. BioEnergy Research. https://doi.org/10.1007/s12155-019-10062-1

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Content : Accepted Version
Restricted access till end- January 2021.
Item Type: Journal Articles
Refereed: Yes
Status: Published
Abstract: 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. R 2 =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. R 2 =0.73, p<0.01) and the proportion of coarse roots (diameter > 1 cm) deeper than 10 cm (adj. R 2 =0.75, p<0.01), whereas clay content was related to root branching occurrence-toaboveground productivity ratio (adj. R 2 =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 rootto- 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.
Official URL: https://link.springer.com/article/10.1007/s12155-0...
Depositor: Bélanger, Nicolas
Owner / Manager: Nicolas Bélanger
Deposited: 18 Nov 2019 20:58
Last Modified: 18 Nov 2019 20:58

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