| Abstract: | This study characterizes organic carbon (Corganic) and phosphorus (P) geochemistry in surface sediments of the Sacramento-San Joaquin Delta, California. Sediment cores were collected from five sites on a sample transect from the edge of the San Francisco Bay eastward to the freshwater Consumnes River. The top 8 cm of each core were analyzed (in 1-cm intervals) for Corganic, four P fractions, and redox-sensitive trace metals (uranium and manganese). Sedimentary Corganic concentrations and Corganic:P ratios decreased, while reactive P concentrations increased moving inland in the Delta. The fraction of total P represented by organic P increased inland, while that of authigenic P was higher bayward than inland reflecting increased diagenetic alteration of organic matter toward the bayward end of the transect. The redox indicator metals are consistent with decreasing sedimentary suboxia inland. The distribution of P fractions and C:P ratios reflect the presence of relatively labile organic matter in upstream surface sediments. Sediment C and P geochemistry is influenced by site-specific particulate organic matter sources, the sorptive power of the sedimentary material present, physical forcing, and early diagenetic transformations presumably driven by Corganic oxidation. ?? 2005 Estuarine Research Federation. |
| Genre: | Article |
| ProdID: | 70028227 |
| Citation Author: | Nilsen, E. B.; Delaney, M. L. |
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| Citation End Page: | 663 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Estuaries |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Factors influencing the biogeochemistry of sedimentary carbon and phosphorus in the Sacramento-San Joaquin Delta; 2005; Article; Journal; Estuaries; Nilsen, E. B.; Delaney, M. L. |
| Citation Start Page: | 653 |
| Citation Volume: | 28 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Factors influencing the biogeochemistry of sedimentary carbon and phosphorus in the Sacramento-San Joaquin Delta; 2005; Article; Journal; Estuaries; Nilsen, E. B.; Delaney, M. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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