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

Pedro J. Aphalo, Markku Lahti, Tarja Lehto (email), Tapani Repo, Aino Rummukainen, Hannu Mannerkoski, Leena Finér

Responses of silver birch saplings to low soil temperature

Aphalo P. J., Lahti M., Lehto T., Repo T., Rummukainen A., Mannerkoski H., Finér L. (2006). Responses of silver birch saplings to low soil temperature. Silva Fennica vol. 40 no. 3 article id 328. https://doi.org/10.14214/sf.328

Abstract

Two-year-old silver birch (Betula pendula) saplings were grown for a third growing season in controlled-environment rooms (dasotrons) at three soil temperatures (5, 10, and 20 °C). All trees grew the first flush of leaves, but the growth of the second flush was almost completely inhibited at the two lower temperatures. The dry weight of the second-flush leaves was 50 times larger at 20 °C than at 5 and 10 °C, with about 100 times more nitrogen. Root growth was less affected than shoot growth. Chlorophyll content, net assimilation rate and stomatal conductance were lower at low soil temperatures. The value of the cytoplasm resistance estimated from the electric impedance spectra was lower at 5 °C than at 10 or 20 °C. Leaf water potential was highest at the lowest soil temperature, and intercellular carbon dioxide concentration was only slightly lower in saplings growing in cooler soil. We conclude that the effect of long-term exposure to cold soil on net assimilation and growth was not caused by stomatal closure alone. It is likely to be additionally mediated by the limited nitrogen acquisition at the low soil temperatures, and perhaps additionally by some other factor. As the growth depression of aboveground parts in response to low soil temperature was more significant in silver birch than what has earlier been found in conifers, the relative changes in air and soil temperature may eventually determine whether birch will become more dominant in boreal forests with climate change.

Keywords
biomass; Betula pendula; photosynthesis; electrical impedance; mineral nutrients; soil temperature; stomatal conductance; water relations

Author Info
  • Aphalo, University of Helsinki, Department of Biological and Environmental Sciences E-mail pja@nn.fi
  • Lahti, The Finnish Forest Research Institute E-mail ml@nn.fi
  • Lehto, University of Joensuu, Faculty of Forestry, Box 111, FI-80101 Joensuu, Finland E-mail tarja.lehto@joensuu.fi (email)
  • Repo, The Finnish Forest Research Institute E-mail tr@nn.fi
  • Rummukainen, University of Joensuu, Faculty of Forestry, Box 111, FI-80101 Joensuu, Finland E-mail ar@nn.fi
  • Mannerkoski, University of Joensuu, Faculty of Forestry, Box 111, FI-80101 Joensuu, Finland E-mail hm@nn.fi
  • Finér, The Finnish Forest Research Institute E-mail lf@nn.fi

Received 22 March 2005 Accepted 10 May 2006 Published 31 December 2006

Views 3870

Available at https://doi.org/10.14214/sf.328 | 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
Hänninen H., Kellomäki S. et al. (1996) Overwintering and productivity of Scots pine in .. Silva Fennica vol. 30 no. 2–3 article id 5590
Leinonen I., Hänninen H. et al. (1996) Testing of frost hardiness models for Pinus sylv.. Silva Fennica vol. 30 no. 2–3 article id 5583
Hänninen H., Kellomäki S. et al. (1993) Effect of increased winter temperature on the on.. Silva Fennica vol. 27 no. 4 article id 5518
Repo T., (1991) Rehardening potential of Scots pine seedlings du.. Silva Fennica vol. 25 no. 1 article id 5437
Valkonen M.-L., Hänninen H. et al. (1990) Frost hardiness of Scots pine seedlings during d.. Silva Fennica vol. 24 no. 4 article id 5433
Repo T., (1988) Physical and physiological aspects of impedance .. Silva Fennica vol. 22 no. 3 article id 5351
Repo T., Volanen V. et al. (2022) No difference in the maximum frost hardiness of .. Silva Fennica vol. 56 no. 2 article id 10620
Räisänen M., Repo T. et al. (2009) Cold acclimation of Norway spruce roots and shoo.. Silva Fennica vol. 43 no. 2 article id 208
Aphalo P. J., Lahti M. et al. (2006) Responses of silver birch saplings to low soil t.. Silva Fennica vol. 40 no. 3 article id 328
Repo T., Laukkanen J. et al. (2005) Measurement of the tree root growth using electr.. Silva Fennica vol. 39 no. 2 article id 380
Partanen J., Leinonen I. et al. (2001) Effect of accumulated duration of the light peri.. Silva Fennica vol. 35 no. 1 article id 608