Browsing by Subject "Salix"

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  • Yli-Halla, Markku; Lumme, Ilari (Suomen metsätieteellinen seura, 1987)
  • Fyhrquist, Pia (University of Helsinki, 1994)
  • Bhat, K. M.; Ferm, Ari; Kärkkäinen, Matti (Suomen metsätieteellinen seura, 1981)
  • Malmivaara, Eero; Mikola, Jouni; Palmberg, Christel (Suomen metsätieteellinen seura, 1971)
  • Makkonen, Olli (Suomen metsätieteellinen seura, 1975)
  • Rasa, Kimmo; Vihera-Aarnio, Anneli; Rytkonen, Peetu; Hyvaluoma, Jari; Kaseva, Janne; Suhonen, Heikki; Jyske, Tuula (2021)
    Novel bioeconomic approaches call for increasingly faster production of lignocellulosic biomass and its bettertailored use for higher added value. The high-yield capacity and structural properties of willows (Salix spp.) suggest their excellent potential for the production of designed biochar for use in agronomic, electronic and technical applications. All these applications rely on the internal pore structure of biochar. However, we lack an in-depth quantitative understanding of the interlinkages between the feedstock properties and the physical quality of the biochar produced. We studied quantitatively how the clonal and within-plant properties of five different willow clones (hybrids of Salix schwerinii E.L. Wolf) affected the micrometre-scale pore properties of the produced biochars (pyrolyzed at + 462 ?C). The porosity and pore size distribution were analysed before and after slow pyrolysis by X-ray microtomography and image analysis. We also studied the potential of conventional low-cost fibre analysis techniques to be used to predict biochar pore properties directly from fresh feedstock. The total porosity (0.55?0.62) and the pore size distribution of willow wood and derived biochars varied between clones. Approximately two-thirds of the biochar total porosity was associated with pores formed by wood fibres. Pyrolysis levelled off the structural variation detected between and within the clones. Pyrolysis-induced shrinkage reduced the pore sizes and narrowed the pore size distribution. The results suggest that conventional fibre analysis techniques could be utilized to predict biochar homogeneity. Short rotation coppice willows are suitable feedstock to produce homogenous biochar precursor for production of bio-based carbon materials to be used in high value-added technical applications. The structural homogeneity of the feedstock and produced biochar can be enhanced by selecting proper harvesting strategy and clones used in plantations. From the industrial perspective, comprehensive understanding of feedstock properties helps to control quality of the produced biochar.
  • Pohjonen, Veli (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1991)
    In sections 1-3 of this report, brief reviews are presented of the genus Salix and its use (especially for biomass) in Finland. In section 4, the results from early breeding programmes in Finland (1910-79) are analysed. In section 5, selection of biomass willows in the 1980s is reviewed. Some 63 exotic willow clones (mainly S. burjatica and S. viminalis) from Sweden were screened at the Kopparnas willow research site, S. Finland, from 1983 to 1989. S. viminalis showed consistently high yields. The yield variation of S. burjatica was large because of an outbreak of rust (Melampsora sp.), followed by lowered winter hardiness. Three S. viminalis clones were recommended for S. Finland: 78-0-183 (Sweden), E7888 (Somero, Finland) and 78-0-21 (Sweden). Selection of indigenous species and clones was based mainly on a collection of 375 clones of the Foundation of Forest Tree Breeding and a collection of 566 clones of the Finnish 4H-organization. The clones were grown at Suomusjarvi, Nurmijarvi, Kannus and Haapavesi. S. myrsinifolia was the most productive; 5 clones were recommended: E6631 (Kulaa), K2322 (Heinavesi), E6695 (Hartola), V75 (Mikkeli) and V78 (Loppi). S. phylicifolia was the second most productive species and the most promising clones were E6682 (Juva), V766 (Pieksamaki) and V754 (Kuru). Willow hybridization studies have also been carried out. Further intraspecific crossings of geographically distant S. myrsinifolia clones are recommended. Based on research results from 1910 to 1990, S. viminalis is recommended for biomass forestry in S. Finland and S. myrsinifolia is recommended for research in other areas. A list of Salix species, subspecies, varieties, forms, hybrids and synonyms is given in an appendix (pp. 44-58).
  • Smolander, Heikki; Lappi, Juha (Suomen metsätieteellinen seura, 1984)
  • Nordberg, Seth (Suomen metsätieteellinen seura, 1928)
    Silva Fennica