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

https://doi.org/10.17221/3606-PSECitation:Sah S.P. (2005): 15N natural abundances in two podsol soils of two spruce forests differing in their atmospheric N deposition conditions. Plant Soil Environ., 51: 416-422.
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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
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