Current issue: 53(2)

Under compilation: 53(3)

Impact factor 1.683
5-year impact factor 1.950
Silva Fennica 1926-1997
1990-1997
1980-1989
1970-1979
1960-1969
Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Silva Fennica 1926-1997 vol. 11 no. 2 | 1977

Category: Article

article id 4970, category Article
Markku Mäkelä. (1977). Metsähakkeen tiheyden laskeminen. Silva Fennica vol. 11 no. 2 article id 4970. https://doi.org/10.14214/sf.a14821
English title: Calculating the basic density of whole tree- and logging residue chips.

A method is presented in this study for calculating the basic density of whole tree- and logging residue chips and the results of trial measurements on some commonly used chip sorts. The basic density of Scots pine whole tree chips was found to be 1–18 kg/m3 smaller than that of pine pulpwood of the same age. The basic density of Norway spruce whole tree chips was 4–22 kg/m3 greater than that of similar aged pulpwood. The basic density of birch whole tree chips was 4–16 kg/m3 and grey alder whole tree chips 7–24 kg/m3 greater than pulpwood of the same age. The basic density of conifer logging residue chips was considerably greater than that of pine and spruce whole tree ships.

The PDF includes a summary in English.

  • Mäkelä, ORCID ID:E-mail:
article id 4969, category Article
Robert J. Rainio. (1977). Tammen levinneisyydestä läntisellä Uudellamaalla ja Turunmaan itäisimmissä osissa. Silva Fennica vol. 11 no. 2 article id 4969. https://doi.org/10.14214/sf.a14820
English title: On the distribution of oak (Quercus robur) in the southwest parts of Finland.

The maps concerning the natural distribution of oak (Quercus robur L.) have proved most unreliable in detailed examination. In this paper, the author has collected his observations on natural oak in the westernmost parts of the province of Uusimaa and the easternmost parts of province of Turunmaa, the islands included. Furthermore, the paper includes some viewpoints which must be considered as criteria when determining the naturality of the stand in question. Future borders of oak’s distribution range must be moved farther up north to replace the earlier views of the northern limit of natural oak in Finland.

The PDF includes a summary in English.

  • Rainio, ORCID ID:E-mail:
article id 4968, category Article
Finnish Society of Forest Science. (1977). Suomen Metsätieteellisen Seuran metsäntutkimuksen suuntautumista ja tiedonvälitystä koskeva seminaari. Silva Fennica vol. 11 no. 2 article id 4968. https://doi.org/10.14214/sf.a14819
English title: Seminar on the targets of forestry research and communication, arranged by the Finnish Society of Forest Science on March 1977.

The Finnish Society of Forest Science arranged on 16 March 1977 a seminar where targets of forestry research and communication were discussed by scientists, as well as publicists and users of scientific information. This paper includes summaries of some of the speeches and the reports of the workshops. The theme of the seminar was Forest science and practice – Do we understand each other?

  • Finnish Society of Forest Science, ORCID ID:E-mail:
article id 4967, category Article
Finnish Society of Forest Science. (1977). Suomen Metsätieteellisen Seuran tiedepoliittinen periaateohjelma. Silva Fennica vol. 11 no. 2 article id 4967. https://doi.org/10.14214/sf.a14818
English title: Science policy agenda of the Finnish Society of Forest Science.

The paper introduces the science policy agenda of the Finnish Society of Forest Science that defines the role of the society and the principals that are required from research work.

  • Finnish Society of Forest Science, ORCID ID:E-mail:
article id 4966, category Article
Markku Mäkelä. (1977). Seulontatuloksia Algol-monikäyttöhakkurin hakkeesta. Silva Fennica vol. 11 no. 2 article id 4966. https://doi.org/10.14214/sf.a14817
English title: Screening results on the chips made by Algol-multipurpose chipper.
Original keywords: hake; hakkurit; hakkeen laatu

The first part of this paper consists of a study based on the available literature concerning the analysis of chip quality in the sulphate pulp process and the factors having an effect on chip quality. Using the empirical material, the suitability of the Williams chip classifier in evaluating the quality of chips made by the Algol chipper is first studied. The distribution of length and thickness of pulpwood-, long logs-, whole tree-, and logging residue chips in different conditions determined by screening is then presented.

The PDF includes a summary in English.

  • Mäkelä, ORCID ID:E-mail:
article id 4965, category Article
Matti Kärkkäinen, Marjut Raivonen. (1977). Reaktiopuun mekaaninen lujuus. Silva Fennica vol. 11 no. 2 article id 4965. https://doi.org/10.14214/sf.a14816
English title: Mechanical strength of reaction wood.
Original keywords: lyly; reaktiopuu; vetopuu; lujuus

According to the literature, the mechanical strength of the green reaction wood of softwood species (compression wood) is greater than that of normal wood. Drying increases the mechanical strength but less in reaction wood than in normal wood. In particular, the tensile strength along the grain and the impact strength are lower than in normal wood. The compression strength and possibly bending strength are greater, however.

The properties of the reaction wood of hardwood species (tension wood) differ from those of softwoods. When green, all mechanical properties are weaker than those of normal wood. When dried, the tensile strength and impact strength are better and compression strength lower. There is no great difference in the bending strength.

When the higher density of reaction wood is not taken into account and there are no impact forces, the mechanical strength of reaction wood in sawn goods etc. does not differ so much from that of normal wood. The harmful effect of knots, for example, can in practice be much greater.

The PDF includes a summary in English.

  • Kärkkäinen, ORCID ID:E-mail:
  • Raivonen, ORCID ID:E-mail:

Register
Click this link to register for Silva Fennica submission and tracking system.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content
Your selected articles

Committee on Publication Ethics A Trusted Community-Governed Archive