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Articles by Risto Sarvas

Category : Article

article id 4638, category Article
Risto Sarvas. (1953). Ohjeita pluspuiden valitsemista ja ilmoittamista varten. Silva Fennica no. 80 article id 4638. https://doi.org/10.14214/sf.a14054
English title: Instruction for the selection and registration of plus trees.
Original keywords: metsäopetus; jatkokoulutus; metsänuudistaminen; siementuotanto; metsänjalostus; pluspuu
English keywords: regeneration; selection; breeding; seed production; forest education
Abstract | View details | Full text in PDF | Author Info

Silva Fennica Issue 80 includes presentations held in 1952 in the 7th professional development courses, arranged for foresters working in the Forest Service. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service.

This presentation describes principles of breeding of forest trees and the selection of fast growing, healthy and qualitatively good trees, named plus trees, for seed production in Finland.

  • Sarvas, E-mail: rs@mm.unknown (email)
article id 4586, category Article
Risto Sarvas. (1948). Metsäpuiden rodunjalostuksesta. Silva Fennica no. 64 article id 4586. https://doi.org/10.14214/sf.a13988
English title: Forest tree breeding.
Original keywords: metsäopetus; metsänhoitajien jatkokurssit; metsähallinto; jatkokoulutus; Metsänjalostussäätiö; metsänjalostus
English keywords: forest administration; forest education; Foundation of Forest Tree Breeding; forest tree breeding
Abstract | View details | Full text in PDF | Author Info

Silva Fennica Issue 64 includes presentations held in the third professional development courses, arranged for foresters working in the public administration in 1947. The presentations focus on practical issues in forest management and administration, especially in regional level. The education was arranged by Forest Service. Two of the presentations were published in other publications than Silva Fennica.

This presentation introduces the aims and work of Foundation of Forest Tree Breeding, established in 1946.

  • Sarvas, E-mail: rs@mm.unknown (email)
article id 4547, category Article
Risto Sarvas. (1938). Ilmavalokuvauksen merkityksestä metsätaloudessamme. Silva Fennica no. 48 article id 4547. https://doi.org/10.14214/sf.a9072
English title: Use of aerial photography in forestry.
Original keywords: metsätalous; ilmakuvaus; kaukokartoitus; kuvatulkinta; metsänarviointi
English keywords: aerial photography; forest mensuration; aerial stereo photography
Abstract | View details | Full text in PDF | Author Info

The article is a treatise on use of aerial photography in forestry and its prodpective applications in Finland, based on the writers visit to Techniche Hohschule Dresden in Germany and experiences in his work in Forest Service.

Optimal conditions and principals of aerial photography are described. There is potential in use of aerial photography in Finland. The terrain is relatively flat, and large areas, especially in Lapland, are inadequately mapped. However, to fulfil the current requirements for forest maps, aerial photography should be carried out as aerial stereo photography at a sufficiently large scale. At a certain scale terrain survey becomes cheaper than aerial photography.

In forestry, aerial photography cannot substitute terrain survey, but it complements it. Aerial photographs could, for instance, form a photo archive of a region or be used as a basis for planning drainage of peatlands. In research, aerial stereo photography could become a new discipline.

The article has a German summary.

  • Sarvas, E-mail: rs@mm.unknown (email)
article id 4524, category Article
Risto Sarvas. (1937). Havaintoja kasvillisuuden kehityksestä Pohjois-Suomen kuloalueilla. Silva Fennica no. 44 article id 4524. https://doi.org/10.14214/sf.a9069
English title: Observations on development of vegetation in burned areas in Northern Finland.
Original keywords: Pohjois-Suomi; kasvillisuus; kuloala; metsäpalo; metsätyyppi; sukkessio
English keywords: succession; vegetation; northern Finland; forest fire; forest site type; dry upland forest site
Abstract | View details | Full text in PDF | Author Info

The aim of the study was to follow development of vegetation in dry upland forest sites after forest fire. The sample sites were situated in the counties of Muonio, Kolari, Sodankylä, Pelkosenniemi, Savukoski, Kemijärvi and Salla, in the northernmost Finland.
The growth of plant communities can arise either from the vegetation and seeds that survived the fire, or from seeds that spread from the surrounding areas. The development of vegetation in the burned areas was unexpectedly independent of the surrounding areas, which indicates that role of the seeds from the outside of the burned ares is small. The occurence of different species of lichens, moss, scale moss and vascular plants in the burned areas are described in detail. The development of vegetation was strongly dependent on the forest site type. The thin humus layer of Cladina site type burns usually evenly, and also the vegetation develops more evenly than in the more fresh site types. Vegetation typical for burned areas was fully developed within 10-15 years, and after 25 years it began to resemble the vegetation of Cladina site type forests. The ground vegetation of Calluna type burned area was more patchy. It developed quicker than in Cladina type. Absense of lichens made it seem more fertile than is usual for Calluna type. The humus layer of Empetrum-Myrtillus site type burned unevenly, and if the area was lightly burned, the vegetation recovered quickly. The vegetation was often patchy.
The PDF includes a summary in German.

  • Sarvas, E-mail: rs@mm.unknown (email)

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