Provenance and Individual Variation in Climatic Hardiness of Scots Pine in Northern Finland

  • Jouni Mikola
Part of the NATO ASI Series book series (NSSA, volume 244)


In the optimum zone of Scots pine (Pinus sylvestris L.) in northern Finland, seed matures when 77 percent of the local average annual heat sum is reached (Sarvas, 1967, 1970). In absolute units, the temperature sum required for seed maturation is much higher for southern provenances than for northern ones. In the northern marginal areas, 950 growing degree days (d.d.) at a 5 °C threshold is the lowest average heat sum to which the annual development cycle of Scots pine is genetically adapted. In places where the average annual heat sum falls below this limit, for example, north 65° to 66° N. latitude in Finland (Fig. 1), all provenances and individuals have roughly the same minimum heat requirement of 950 degree days for complete ripening of the seed (Ryynänen, 1982; Sarvas, 1967, 1970).


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  1. Björnstadt, Â., 1981, Photoperiodical after-effects of parent plant environment in Norway spruce (Picea abies (L.) Karst.) seedlings, Communic. Norwegian Forest Res. Inst. 36(6):1–30.Google Scholar
  2. Eiche, W., and Andersson, E., 1977, Survival and growth in Scots pine (Pinus sylvestris L.), provenance experiments in northern Sweden, Theor. and Appl. Gen. 26(5–6):168–175.Google Scholar
  3. Kolkki, 0., 1966, Tables and maps of temperature in Finland during 1931–1960, Meteorol. Yearbook of Finland, Vol. 65, Part la: 1–42.Google Scholar
  4. Koski, V., 1987, Long geographic transfers, a possible way of eliminating pollen contamination in advanced-generation seed orchards, Forest Ecol. and Manage. 19:267–271.Google Scholar
  5. Langlet, 0., 1959, A cline or not a cline—a question of Scots pine, Silvae Genetica 8(1):13–22.Google Scholar
  6. Mikola, J., 1982, Bud-set phenology as an indicator of climatic adaptation of Scots pine in Finland, Silva Fennica 16 (2): 178–184.Google Scholar
  7. Mikola, J., 1986, Reference material as an aid in interpreting progeny test results, Proceed-ings of a IUFRO Conference, A Joint Meeting of Working Parties on Breeding Theory, Progeny Testing and Seed Orchards, 1986 October 13–17, Williamsburg, Virginia, The North Carolina State University-Industry Cooperative Tree Improvement Program, North Carolina State University, Raleigh, North Carolina, United States, 482–491.Google Scholar
  8. Nikkanen, T., 1982, Survival and height growth of North Finland x South Finland hybrid progenies of Scots pine in intermediate areas, Folia Forestalia 527: 1–31.Google Scholar
  9. Ryynänen, M., 1982, Individual variation in seed maturation in marginal populations of Scots pine, Silva Fennica 16 (2): 185–187.Google Scholar
  10. Sarvas, R., 1967, The annual period of development of forest trees, Proceedings of the Finnish Academy of Science and Letters 1965 Helsinki, 211–231.Google Scholar
  11. Sarvas, R., 1969, Genetical adaptation of forest trees to the heat factor of the climate, Second World Consultation on Forest Tree Breeding, 1969 August 7–16, Washington, D.C., FAO and IUFRO, Paper FO-FTB-69–2/15, 1–11.Google Scholar
  12. Sarvas, R., 1970, Establishment and registration of seed orchards, Folia Forestalia 89: 1–24.Google Scholar

Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • Jouni Mikola
    • 1
  1. 1.Foundation for Forest Tree Breeding HelsinkiFinland

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