Plant Soil Environ., 2005, 51(9):416-422 | DOI: 10.17221/3606-PSE

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

S.P. Sah
Department of Forest Ecology, University of Helsinki, Finland

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

Keywords: N-deposition; 15N; nitrogen; spruce; soil

Published: September 30, 2005  Show citation

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Sah SP. 15N natural abundances in two podsol soils of two spruce forests differing in their atmospheric N deposition conditions. Plant Soil Environ. 2005;51(9):416-422. doi: 10.17221/3606-PSE.
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