Abstract
We examined pore water dissolved carbon pools among three wetland habitats defined by different plant species, and asked if temporal dynamics in C pools were related to temporal patterns of plant production. Concentrations of CH4, DIC, and dissolved organic carbon (DOC) were measured monthly at 4 sediment depths over 1 year in Nymphaea odorata (NY), Proserpinaca palustris (PR), and Juncus effusus (JU) habitats. CH4 and DIC differed among plant zones, depths, and month, while DOC averaged 1 mM regardless of depth, time, or zone. CH4 and DIC increased linearly with depth in NY and PR, while both forms remained low (<0.25 mmole/L CH4 and <1.5 mmole/L DIC), between 2 and 20 cm in JU in most months. Temporal patterns were also distinct among zones. CH4 had limited seasonal fluctuations in NY and PR but had a distinct summer peak in JU. Conversely, DIC was highly seasonal in NY and PR, but not JU. Correlations between CH4 or DIC and plant density or production were limited to 3 of 12 possible zone-depth combinations. Nonetheless, spatial and temporal patterns of CH4 and DIC revealed significant differences among habitats, and suggest a species-specific influence on local C cycling within the wetland.
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Acknowledgements
This paper is in memory of S.M. Evces for her laboratory, field, and day-to-day help and friendship. We thank Mark Peyton and Eric Hellgren for statistical advice and Paul Boon for assistance with the design of pore water samplers, and for the thoughtful comments provided by two anonymous reviewers. This research was supported by NSF-EPSCoR grant OSR-91-08761.
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Stanley, E.H., Ward, A.K. Effects of Vascular Plants on Seasonal Pore Water Carbon Dynamics in a Lotic Wetland. Wetlands 30, 889–900 (2010). https://doi.org/10.1007/s13157-010-0087-x
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DOI: https://doi.org/10.1007/s13157-010-0087-x