The distribution and source of organic matter in reservoir sediments |
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Authors: | Norman J Hyne |
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Institution: | (1) Earth Sciences Discipline, The University of Tulsa, Tulsa, Oklahoma |
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Abstract: | The bottom sediments of two reservoirs, one with significant river sediment input and one without, were analyzed for organic
matter content. Lake Texoma sediments average 1.0% organic carbon, of which 0.26% organic carbon is deposited by the river
sediments of the Red and Washita River deltas. In Fort Gibson reservoir, where there is minimal river sediment input, the
organic carbon averages 1.2% and is deposited with a strong correlation to water depth (+0.9). There is a significant difference
between the C/N ratio of Lake Texoma sediments (11.5) and Fort Gibson sediments (9.6). The higher C/N ratio is suggested to
be a result of the larger input of terrestrial plant debris (with a high original C/N ratio) by the rivers draining into Lake
Texoma and the relatively high resistance of the lignin material in the plant debris to decomposition in the reservoir sediments. |
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