Trees

, Volume 12, Issue 4, pp 208–214

Stem-growth response of Pinus sylvestris and Picea abies to nitrogen fertilization as related to needle nitrogen concentration

Authors

  • U. Sikström
    • The Forestry Research Institute of Sweden, Glunten, S-751 83 Uppsala, Sweden Tel.: +46 18 188552; Fax: +46 18 188600; e-mail: ulf.sikstrom@skogforsk.se
  • Hans-Örjan Nohrstedt
    • The Forestry Research Institute of Sweden, Glunten, S-751 83 Uppsala, Sweden Tel.: +46 18 188552; Fax: +46 18 188600; e-mail: ulf.sikstrom@skogforsk.se
  • Folke Pettersson
    • The Forestry Research Institute of Sweden, Glunten, S-751 83 Uppsala, Sweden Tel.: +46 18 188552; Fax: +46 18 188600; e-mail: ulf.sikstrom@skogforsk.se
  • Staffan Jacobson
    • The Forestry Research Institute of Sweden, Glunten, S-751 83 Uppsala, Sweden Tel.: +46 18 188552; Fax: +46 18 188600; e-mail: ulf.sikstrom@skogforsk.se
ORIGINAL ARTICLE

DOI: 10.1007/PL00009712

Cite this article as:
Sikström, U., Nohrstedt, H., Pettersson, F. et al. Trees (1998) 12: 208. doi:10.1007/PL00009712

Abstract

 Responses of stem-volume growth to N application were evaluated in relation to foliar N concentrations. Data from N-fertilization experiments in 28 Pinus sylvestris stands and 21 Picea abies stands were used. Relative stem-growth responses were negatively related to concentrations of N in current-year needles of unfertilized trees. There appeared to be a threshold value of 15–16 mg (g DM)–1 N in current-year needles, above which N-application is unlikely to stimulate growth. However, relations were non-significant between N concentrations in current-year needles and the absolute stem-growth response [dm3 ha–1 (5 years)–1]. The indicated threshold values are discussed in relation to other variables reflecting the N richness of the environment.-->

Key words N-saturation Foliar-N threshold

Copyright information

© Springer-Verlag Berlin Heidelberg 1998