 |
| Titel |
Diagenetic alterations of amino acids and organic matter in the upper Pearl River Estuary surface sediments |
| VerfasserIn |
J. Zhang, R. Zhang, Q. Wu, N. Xu |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 1 ; Nr. 9, no. 1 (2012-01-27), S.555-564 |
| Datensatznummer |
250006681
|
| Publikation (Nr.) |
 copernicus.org/bg-9-555-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| The objective of this study was to investigate the diagenetic alteration of
sediment organic matter (OM) in the upper Pearl River Estuary. Sediment
analyses were conducted for three size fractions of OM, including coarse
particulate OM (CPOM), fine particulate OM (FPOM), and ultrafiltered
dissolved OM (UDOM). Results showed that the highest and lowest carbon (C):
nitrogen (N) ratios were in CPOM and UDOM, respectively, indicating that
CPOM was relatively enriched in organic C. The highest average total N
content in the FPOM fraction showed that FPOM was enriched in N-containing
molecules. Our study showed that the "size-reactivity continuum" model was
applicable to sediment particulate and dissolved OM. Distributions of amino
acids and their D-isomers among the sediment fractions indicated that the
amino acid-based diagenetic index, C:N ratio, and percentage of total N
represented by total hydrolysable amino acids could be used as diagenetic
indicators. Furthermore, the diagenetic state of sediment OM could also be
characterized by C- and N-normalized yields of total D-amino acids, and C-
and N-normalized yields of D-alanine, D-glutamic acid, and D-serine. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|