Journal
ORGANIC GEOCHEMISTRY
Volume 42, Issue 2, Pages 173-183Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2010.10.010
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Funding
- Japan Society for the Promotion of Science [21241008]
- GEMS/Water Trend Monitoring Project at Lake Kasumigaura
- Grants-in-Aid for Scientific Research [21241008, 21241001] Funding Source: KAKEN
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Sediment core samples from the center of Lake Kasumigaura, Japan, were collected from 1979 to 2007 at intervals of 1 month to 5 yr. We evaluated the degree of modification in N isotope composition during sedimentation and diagenesis. We estimated the degree of isotope discrimination during diagenesis by comparing historical changes in N isotope composition of the surface sediment (top 2 cm) against the vertical profile of the isotope composition of sediment core samples (15 cm depth). The degree of (15)N enrichment during sedimentation appeared to be significant under the preferential N decomposition that occurred in the periods with low C/N ratio values of suspended particulate organic matter. We documented (15)N depletion in sediment deeper than approximately 3 cm during diagenesis. The contrasting directions of N isotope discrimination during sedimentation and diagenesis suggest changing mechanisms of isotopic shift across an oxidation-reduction boundary. (C) 2010 Elsevier Ltd. All rights reserved.
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