Denser wood lowers transport cost with little impact on biofuel production

Background/Objective

Wood density is an underexplored yet important trait of biomass crops that can be leveraged to improve transportation cost and overall economics. While wood density is known to vary among species, the extent of variation within a species or population is less understood.

Approach

Scientists with the Center for Bioenergy Innovation, the Joint Bioenergy Institute, and the Great Lakes Bioenergy Research Center quantified variation in wood density in a population of Populus trichocarpa and used phenotypic and genomic analyses to assess correlations between density and growth and composition and to estimate genetic control. They used techno-economic modeling to evaluate how variation in wood density impacted biomass production and transportation costs. They processed a subset of genotypes using two bioconversion pipelines to assess impacts of wood density on conversion.

Results

• There was significant variation in wood density with only weak negative correlations with growth traits, indicating poplar can be improved for yield and density with minimal trade-offs.
• Increasing wood density significantly reduced transportation costs up to ~20% due to higher mass per unit volume and improved logistics efficiency. 
• Wood density was not correlated with biomass composition or recalcitrance, and experimental validation showed no significant differences in sugar release, fermentation efficiency, or biofuel yield between high- and low-density genotypes.

Impact/Significance

Increasing wood density can improve the economics of biomass crops without impacting productivity or composition and can enhance supply chain efficiency without negatively affecting biomass conversion. 
Ployet, R. et al. ACS Sustainable Chem. Eng. (2026) 14, 6277–6290, doi:10.1021/acssuschemeng.5c10590