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

Heikki Smolander (email), Seppo Kellomäki, Pauline Oker-Blom

Typpipitoisuuden vaikutus männyn neulasten fotosynteesiin ja verson itsevarjostukseen.

Smolander H., Kellomäki S., Oker-Blom P. (1990). Typpipitoisuuden vaikutus männyn neulasten fotosynteesiin ja verson itsevarjostukseen. Silva Fennica vol. 24 no. 1 article id 5414. https://doi.org/10.14214/sf.a15566

English title: The effect of nitrogen concentration on needle photosynthesis and within shoot shading in Scots pine

Abstract

A close relationship between photosynthetic capacity and nitrogen concentration of leaves is known to exist. In conifers, nitrogen also affects the pattern of mutual shading within a shoot, which is a basic unit used in studying photosynthesis of coniferous trees. These effects of needle nitrogen concentration on photosynthetic capacity and mutual shading of needles were analysed for Scots pine (Pinus sylvestris L.) shoots taken from five young stands growing on sites of different fertility. The effect of nitrogen concentration on needle photosynthesis was studied based on measurements of the photosynthetic radiation response of shoots from which two thirds of the needles were removed in order to eliminate the effect of within shading.

An increase of one percentage unit in nitrogen concentration of needles increased the photosynthetic capacity of needles by 25 mg CO2 dm-2h-1. The effect of nitrogen on within-shoot shading was quantified in terms of the silhouette area to total needle area ratio of a shoot (STAR), which determines the relative interception rate per unit of needle area on the shoot. Although nitrogen promoted needle growth, an increase in nitrogen concentration decreased the within-shoot shading. This effect resulted from a decrease in needle density on the shoot and an increased needle angle with increasing nitrogen content.

The PDF includes an abstract in Finnish.

Original keywords
mänty; ravinteisuus; fotosynteesi; kasvupaikkatekijät; verson rakenne; säteilyn sitomistehokkuus

English keywords
Pinus sylvestris; photosynthesis; shading; fertility; site factors; shoot structure; light interception efficiency

Published in 1990

Views 2184

Available at https://doi.org/10.14214/sf.a15566 | 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
Lippu J., (1994) Patterns of dry matter partitioning and 14C-phot.. Silva Fennica vol. 28 no. 3 article id 5529
Nygren P., Hari P. (1992) Effect of foliar application with acid mist on t.. Silva Fennica vol. 26 no. 3 article id 5481
Pukkala T., Kuuluvainen T. (1987) Effect of canopy structure on the diurnal interc.. Silva Fennica vol. 21 no. 3 article id 5316
Ross J., Kellomäki S. et al. (1986) Architecture of Scots pine crown. Silva Fennica vol. 20 no. 2 article id 5265
Kellomäki S., Oker-Blom P. (1983) Canopy structure and light climate in a young Sc.. Silva Fennica vol. 17 no. 1 article id 5171
Kellomäki S., Puttonen P. et al. (1982) Effect of nitrogen fertilization on photosynthes.. Silva Fennica vol. 16 no. 4 article id 5169
Katainen H.-S., Kellomäki S. (1981) Effect of foliar application of dilute sulphuric.. Silva Fennica vol. 15 no. 3 article id 5123
Kellomäki S., (1981) Effect of the within-stand light conditions on t.. Silva Fennica vol. 15 no. 2 article id 5111
Kellomäki S., (1979) The effect of solar radiation and air temperatur.. Silva Fennica vol. 13 no. 4 article id 5048
Hari P., Kanninen M. et al. (1979) An automatic system for measurements of gas exch.. Silva Fennica vol. 13 no. 1 article id 5019
Smolander H., (1984) Measurement of fluctuating irradiance in field s.. Acta Forestalia Fennica vol. 0 no. 187 article id 7634
Hari P., Kellomäki S. et al. (1982) Dynamics of early development of tree stand Acta Forestalia Fennica vol. 0 no. 177 article id 7624
Hallman E., Hari P. et al. (1978) Effect of planting shock on the transpiration, p.. Acta Forestalia Fennica vol. 0 no. 161 article id 7595