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Anna Maria Jönsson

Professor

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Excess nitrogen affects the frost sensitivity of the inner bark of Norway spruce

Author

  • Anna Maria Jönsson
  • Ulrika Rosengren
  • Bengt Nihlgård

Summary, in English

The sensitivity to frost in the living inner bark of trees have been hypothesised to be influenced by acid rain and N deposition through changes in nutrient balance and carbon metabolism. At the Skogaby experimental site, situated in southern Sweden, Norway spruce in control plots, plots fertilized with ammonium sulphate and plots fertilized with mineral nutrients except N were compared in this respect. Frost sensitivity was measured by electrolytic leakage and expressed as an index of injury. The results showed increased sensitivity to frost in the bark of trees treated with continuous applications of ammonium sulphate for 11 years. This was probably not only a direct effect of high nitrogen availability, but also caused by insufficient levels of other nutrients due to the rapid growth and changes in soil chemistry induced by the addition of ammonium sulphate. Mainly Mg and K seemed to be of importance for retaining a good frost resistance, supporting the hypothesis that nutrient imbalances increases the risk for development of frost related bark lesions in southern Sweden.

Department/s

  • Dept of Physical Geography and Ecosystem Science
  • Department of Biology
  • Biodiversity

Publishing year

2004

Language

English

Pages

293-298

Publication/Series

Annals of Forest Science

Volume

61

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Ecology

Status

Published

ISBN/ISSN/Other

  • ISSN: 1286-4560