Organic matter processing in arctic lake sediments ...
Lakes are a common landscape feature in the arctic and interact with carbon cycling through the sequestration of organic matter in their sediments. My research assessed the relative importance of landscape- and within-lake-scale factors on organic matter cycling in arctic lake sediments. Sediment or...
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| Format: | Thesis |
| Language: | English |
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University of North Carolina at Chapel Hill
2010
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| Online Access: | https://dx.doi.org/10.17615/ns8p-0k77 https://cdr.lib.unc.edu/concern/dissertations/s4655h612?locale=en |
| Summary: | Lakes are a common landscape feature in the arctic and interact with carbon cycling through the sequestration of organic matter in their sediments. My research assessed the relative importance of landscape- and within-lake-scale factors on organic matter cycling in arctic lake sediments. Sediment organic matter mineralization (measured as sediment oxygen demand) varied between -8 and 40 mmol O2 m-2 d-1 and was proportional to water temperature and oxygen concentration. There was greater variation in organic matter mineralization within lakes than between lakes, suggesting that variation in mineralization occurs primarily at the within-lake scale. At the both the landscape- and within-lake-scale, sediment slurries with greater percent organic matter had a higher rate of dissolved inorganic carbon (DIC) production and the effect of oxygen exposure on DIC production was greatest in those sediments with the lowest percent organic matter. Despite the variation in mineralization, organic matter content of the ... |
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