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| Titel |
Assessment of terrigenous organic carbon input to the total organic carbon in sediments from Scottish transitional waters (sea lochs): methodology and preliminary results |
| VerfasserIn |
P. S. Loh, A. D. Reeves, J. Overnell, S. M. Harvey, A. E. J. Miller |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 6, no. 6 ; Nr. 6, no. 6, S.959-970 |
| Datensatznummer |
250003853
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| Publikation (Nr.) |
 copernicus.org/hess-6-959-2002.pdf |
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| Zusammenfassung |
| This paper addresses the
assessment of terrestrially derived organic carbon in sediments from two
Scottish sea lochs. The results illustrate a smooth
decrease in area-specific sediment oxygen uptake rates along a transect of six
stations from the head of Loch Creran to the sea, from
18.7 mmol O2m-2d-1 to
6.6 mmol O2m-2d-1. Measurement of the
losses on ignition at two temperatures
(250°C and 500°C) of the sediment fraction from 1–2 cm
depth at the same stations enabled the proportion of weight loss that occurred
over the high temperature range to be calculated. These
show a smooth increase from 0.33 to 0.62. These observations indicate that (a)
the amount of easily biodegradable organic material in the
sediment decreases by two-thirds along the transect and (b) the proportion of
refractory organic material in the sediment increases
along the same transect. This suggests strongly that terrigenous organic
material, brought down by the River Creran is a very important
fuel for sediment diagenetic processes in this system. Preliminary analyses of
the lignin composition of the same sediments indicate the
predominance of non-woody gymnosperm tissue. Lignin is used as a proxy for
terrigenous allochthonous material. Comparative data for Loch
Etive are also presented.
Keywords: sedimentary organic carbon, Loch Creran, Loch Etive,
oxygen uptake, lignin analysis |
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