Full text of this article is only available in PDF format.

Mats Hannerz (email), Curt Almqvist, Roland Hörnfeldt

Timing of seed dispersal in Pinus sylvestris stands in central Sweden

Hannerz M., Almqvist C., Hörnfeldt R. (2002). Timing of seed dispersal in Pinus sylvestris stands in central Sweden. Silva Fennica vol. 36 no. 4 article id 518. https://doi.org/10.14214/sf.518

Abstract

The objective of the study presented here was to describe the variation in timing of seed dispersal from Scots pine (Pinus sylvestris L.) seed trees in central Sweden. Seeds were collected in traps at two sites, for three years at one, and four years at the other . The traps were emptied from March to August each year at 1–2 week intervals during the main period of seed dispersal. The annual seed fall varied between 200 000 and 1.6 million seeds per hectare. The seed fall started in mid to late April, shortly after the heat sum had started to accumulate. The most intensive seed fall took place in early to mid May. The peak period, when 50% of the total seed dispersal occurred, lasted for 18–28 days at the different sites and years. The variation in timing among years seemed to be mainly due to climatic factors – high temperatures promoted seed dispersal, for instance. The results may be useful for planning the time of scarification to optimise the natural regeneration of Scots pine. The data suggest that scarification in the spring, no later than mid-May, would generally create a good seed-bed for most of the current year’s seeds, whereas scarification in late May or June would bury a large proportion of this cohort.

Keywords
natural regeneration; Scots pine; seed fall

Author Info
  • Hannerz, The Forestry Research Institute of Sweden (SkogForsk) Uppsala Science Park, SE-751 83 Uppsala, Sweden E-mail mats.hannerz@skogforsk.se (email)
  • Almqvist, The Forestry Research Institute of Sweden (SkogForsk) Uppsala Science Park, SE-751 83 Uppsala, Sweden E-mail ca@nn.se
  • Hörnfeldt, Swedish University of Agricultural Sciences, Dept. of Forest Products and Markets, P.O. Box 7060, SE-750 07 Uppsala, Sweden E-mail rh@nn.se

Received 11 October 2001 Accepted 26 August 2002 Published 31 December 2002

Views 3375

Available at https://doi.org/10.14214/sf.518 | Download PDF

Creative Commons License CC BY-SA 4.0

Register
Click this link to register to Silva Fennica.
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
Your search results
Kuuluvainen T., Pukkala T. (1989) Effect of Scots pine seed trees on the density o.. Silva Fennica vol. 23 no. 2 article id 5379
Pukkala T., (1987) Model for predicting the seed crop of Picea abie.. Silva Fennica vol. 21 no. 2 article id 5311
Kellomäki S., Hänninen H. et al. (1987) A tentative model for describing the effects of .. Silva Fennica vol. 21 no. 1 article id 5302
Kolehmainen V. A., (1955) Effect of prescribed burning in the forest regen.. Silva Fennica vol. no. 85 article id 4644
Kalela E. K., (1954) Root systems of Scots pine seed trees and stands Acta Forestalia Fennica vol. 61 no. 28 article id 7440