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

Plant, Soil and Environment

Sah S.P.¹ 

关键词: N-deposition;    15N;    nitrogen;    spruce;    soil;   

DOI  :  

学科分类：农业科学（综合）

来源: Czech Academy of Agricultural Sciences

【 摘 要 】

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

【 授权许可】

Unknown