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Isotope ratios and concentration of N in needles, roots and soils of Norway spruce (Picea abies [L.] Karst.) stands as influenced by atmospheric deposition of N

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  • S. P. Sah

    (Department of Forest Ecology, University of Helsinki, Helsinki, Finland)

Abstract

This study aims to investigate the changes in isotope ratios in foliage and soils of two Norway spruce (Picea abies [L.] Karst.) forests greatly differing in their atmospheric N deposition and climatic conditions. As expected, both N concentrations and δ15N values in needles and roots were found to be significantly higher in the Solling stand (N-saturated) compared to the Hyytialä stand (N-poor). For both stands a typical vertical gradient of the soil 15N-enrichment was observed. As expected, the soil of N-polluted site (Solling) was 15N-enriched significantly more than that of N-limited site (Hyytialä) and this is explained by the presence of marked NO3- leaching at the Solling site. Although the annual trends (1990-1994) of N concentration in the foliage of spruce trees remained almost constant, their δ15N values significantly decreased with the increasing years of sampling. The 15N-depletion in spruce needle litter from 1990 to 1995 was by 2.0‰. This is explained by a slight decrease in N deposition at Solling site during this period.

Suggested Citation

  • S. P. Sah, 2005. "Isotope ratios and concentration of N in needles, roots and soils of Norway spruce (Picea abies [L.] Karst.) stands as influenced by atmospheric deposition of N," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 51(10), pages 468-475.
    • Handle: RePEc:caa:jnljfs:v:51:y:2005:i:10:id:4580-jfs
    DOI: 10.17221/4580-JFS
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    Keywords

    N-deposition; 15N; nitrogen; spruce; soil;
    All these keywords.

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