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Silva Fennica 1926-1997
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Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Silva Fennica no. 90 | 1956

Category : Article

article id 4669, category Article
V. A. Kolehmainen. (1957). Vehkatallinmaa. Silva Fennica no. 90 article id 4669. https://doi.org/10.14214/sf.a9116
English title: Vehkatallinmaa, a successful reforestation area in Central Finland.
Original keywords: luontainen uudistuminen; kylvö; metsitys; metsäpalot
English keywords: regeneration; natural regeneration; forest fire; sowing
Abstract | View details | Full text in PDF | Author Info

In 1933, forest fire caused by locomotive sparkle burned about 600 hectares of forest in a forest district named Vehkatallinmaa, in Central Finland. In 1934–36, the burned area was reforested, using different sowing and planting methods. At the same time, areas with poor runoff were drained. The results from reforestation throughout the area have been good. Also, natural regeneration of coniferous trees, especially Scots pine (Pinus sylvestris L.) has occurred. Even deciduous trees, especially birch (Betula sp.), have regenerated naturally in the area. The forests are an evidence of the adaptability of broadcast sowing on snow crust as a method of reproduction.

The PDF includes a summary in English.

  • Kolehmainen, E-mail: vk@mm.unknown (email)
article id 4668, category Article
E. E. Stentzel. (1957). Forest work science and technics in the German Democratic Republic. Silva Fennica no. 90 article id 4668. https://doi.org/10.14214/sf.a9114
Keywords: work study; mechanization; forest work; DDR
Abstract | View details | Full text in PDF | Author Info

Forest work is physically hard. However, there are ways to make the work less damaging with right practices and utilization of machines. The article firstly presents the legal and silvicultural requirements for forest work. Then the ways to organize the work and machines used as well as the practical implications are discussed. Different work phases such as felling, skidding and transportation of timber are presented.   

The PDG contains a summary in German.

  • Stentzel, E-mail: es@mm.unknown (email)
article id 4652, category Article
Kullervo Kuusela. (1956). Hakkuilla käsiteltyjen koivikoiden rakenteesta ja kasvusta. Silva Fennica no. 90 article id 4652. https://doi.org/10.14214/sf.a9115
English title: On the structure and growth of birch stands treated with cutting.
Original keywords: hakkuut; metsänhoito; metsänarviointi; kasvu; koivu; metsikön rakenne; kasvututkimus
English keywords: forest management; Betula pendula; Betula; Betula pubescens; silver birch; fellings; increment; Betula verrucosa; growth and yield studies
Abstract | View details | Full text in PDF | Author Info

The study is continuation of the earlier structure and growth studies of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.) in Forest Research Institute. The material represents birch stands (Betula verrucosa, now B. pendula, and B. Pubescens L.) in Southern Finland. The stands were treated with different fellings, and in regard to their silvicultural condition classified as good, satisfactory and unsatisfactory. Height of the trees, height of living crown, volume, increment and volume increment and development of stem diameter series was measured.

The most characteristic difference between the silviculturally good and poor stands was that the the annual increment of the good stands concentrated into large size trees, and the increment of unsatisfactory stands into small and inferior trees.

It is concluded that if the aim of stand treatment is to produce large and high quality volume increment, the most favourable stand volume of  birch stands, compared with naturally normal stand volume, seems to be 90-85% at the age of 41-55 years, and 80-70% at the age of 56-65 years. If growth of large size trees is aimed at, the maximum number of the dominant trees per hectares cannot be more than 400 at the age of 50-60 years.

The article includes a summary in English.

  • Kuusela, E-mail: kk@mm.unknown (email)
article id 4651, category Article
Kullervo Kuusela. (1956). Outlines of cartographical and timber surveying unit. Silva Fennica no. 90 article id 4651. https://doi.org/10.14214/sf.a9113
Keywords: Finland; remote sensing; forest mensuration; aerial surveying; forest surveys
Abstract | View details | Full text in PDF | Author Info

After the Second World War Finnish Forest Service was faced with large e-mapping and timber surveying project in Northern Finland. The funds for mapping were very limited. In order to re-map the large areas, the only way was to look for alternative methods for the ground methods. The photogrammetric equipment of Finnish Army was made available to the civil service. Consequently, since 1947 several forest mapping projects were carried out in co-operation between the Forest Service and the Army Topographic Service.

When more funds were coming available for the project, new instruments were acquired. The article describes the present mapping procedure and suggests alternative ways in procedure and utilization of new equipment. It concludes that if the forest area under modern timber management plans is several million acres, the ideal implemental framework for mapping and timber surveying unit in Finland should be the following: Radial Secator RS I and slotted templates for the radial line plot, Stereotope Plotter for drafting general maps, the old Delft Scanning Stereoscope for photo interpretation, and Aero-Sketchmaster for transport of the photo details.

  • Kuusela, E-mail: kk@mm.unknown (email)

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