Willow biomass yields from short-rotation coppice bioenergy systems have been reported across multiple rotations in Europe, USA, and eastern Canada, but data are lacking for the Canadian Prairies. The goal of this study was to evaluate the second rotation biomass yields and stem growth for 30 willow cultivars established in Saskatchewan, Canada in 2007, and coppiced at the end of the first growing season. Detailed stem measurements were collected and all biomass was harvested at the end of the 2010 (first rotation data) and 2013 (second rotation data) growing seasons. The average 3-year cumulative biomass production across all cultivars was 8.1 oven-dry (OD) Mg ha−1 in the second rotation (ranging from 0.6 to 21.3 OD Mg ha−1). The three highest yielding cultivars were Taberg, Tully Champion, and Otisco, with annual production of 6.4–7.1 OD Mg ha−1 year−1 in biomass, which was an increase by 12–44% from the first rotation, and more than double the average for all 30 cultivars (2.7 OD Mg ha−1 year−1), and had an average stool-within-plot survival rate of 81–94%. The 20 lowest clones suffered from higher mortality, which resulted in lower biomass production in the second rotation. These data suggest that the top 10 willow cultivars have a promising potential as a bioenergy source, but more data are needed from the third and successive rotations before a sustainable biomass industry could be established in the Canadian Prairies.
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We thank SUNY-ESF and the Canadian Wood Fibre Centre for the shrub willow cultivar planting stock. We recognize the funding from the Saskatchewan Forest Centre Forest Development Fund, Natural Science and Engineering Research Council (NSERC) of Canada, and the AFIF Chair in Agroforestry and Afforestation at the University of Saskatchewan. We also thank our collaborators: ForestFirst, Nipawin Biomass Ethanol New Generation Co-operative Ltd. and BIOCAP. Many thanks to those who assisted with the establishment of this trial, maintenance, and harvesting: H. Ahmed, M. Cooke, B. Ewen, C. Fatteicher, J. Fisher, D. Jackson, T. King, S. Poppy, D. Richman, D. Sanscartier, A. Smith, R. Urton, K. Woytiuk, J. Ens, S. Konecsni, and C. Stadnyk.
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Amichev, B.Y., Volk, T.A., Hangs, R.D. et al. Growth, survival, and yields of 30 short-rotation willow cultivars on the Canadian Prairies: 2nd rotation implications. New Forests 49, 649–665 (2018). https://doi.org/10.1007/s11056-018-9650-8
- Salix sp.
- Biomass supply
- Fast-growing crops
- Stem growth
- Willow survival
- Biomass yield indicators