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15N natural abundances in two podsol soils of two spruce forests differing in their atmospheric N deposition conditions

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  • S.P. Sah

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

Abstract

This study aims to investigate the changes in isotope ratios in foliage and soils of the two spruce forests [Picea abies (L.) Karst.] differing greatly in their atmospheric N deposition and climatic conditions. As expected, both N concentrations and 15N values in both needles and litter were found to be significantly higher in the Solling stand (N-saturated) compared to the Hyytialä stand (N-poor). For the N-limited site (Hyytialä plot), a typical vertical gradient of the soil 15N-enrichment (both in organic and mineral soil) was observed. The N-saturated site (Solling) differs from the N-limited site (Hyytialä) with respect to the 15N abundance trend in organic layer. In the upper organic layer up to O-f horizon, i.e. mor layer (0-3.5 cm depth) of Solling plot, there is almost a trend of slight soil 15N-depletion with increasing depth, and then there is a 15N-enrichment from O-h horizon (humus layer) of organic layer to mineral soil horizons. This is explained by the presence of prominent NO3- leaching at this plot

Suggested Citation

  • S.P. Sah, 2005. "15N natural abundances in two podsol soils of two spruce forests differing in their atmospheric N deposition conditions," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 51(9), pages 416-422.
    • Handle: RePEc:caa:jnlpse:v:51:y:2005:i:9:id:3606-pse
    DOI: 10.17221/3606-PSE
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    Keywords

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

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