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Importance of terrestrially-derived, particulate phosphorus to phosphorus dynamics in a west coast estuary

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Abstract

Allochthonous inputs of suspended particulate matter from freshwater environments to estuaries influence nutrient cycling and ecosystem metabolism. Contributions of different biogeochemical reactions to phosphorus dynamics in Tomales Bay, California, were determined by measuring dissolved inorganic phosphorus exchange between water and suspended particulate matter in response to changes in salinity, pH, and sediment redox. In serum bottle incubations of suspended particulate matter collected from the major tributary to the bay, dissolved inorganic phosphorus release increased with salinity during the initial 8 h; between 1–3 d, however, rates of release were similar among treatments of 0 psu, 16 psu, 24 psu, and 32 psu. Release was variable over the pH range 4–8.5, but dissolved inorganic phosphorus releases from sediments incubated for 24 h at the pH of fresh water (7.3) and seawater (8.1) were similarly small. Under oxidizing conditions, dissolved inorganic phosphorus release was small or dissolved inorganic phosphorus was taken up by particulate matter with total P content <50 μmoles P g−1; release was greater from suspended particulate matter with total phosphorus content >50 μmoles P g−1. In contrast, under reducing conditions maintained by addition of free sulfide (HS−), dissolved inorganic phosphorus was released from particles at all concentrations of total phosphorus in suspended particulate matter, presumably from the reduction of iron oxides. Since extrapolated dissolved inorganic phosphorus release from this abiotic source can account for only 12.5% of the total dissolved inorganic phosphorus flux from Tomales Bay sediments, we conclude most release from particles is due to organic matter oxidation that occurs after estuarine deposition. The abiotic, sedimentary flux of dissolved inorganic phosphorus, however, could contribute up to 30% of the observed net export of dissolved inorganic phosphorus from the entire estuary.

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Author notes

  1. R. M. Chambers

    Present address: Department of Biology, Fairfield University, 06430, Fairfield, Connecticut

  2. J. W. Fourqurean

    Present address: Southeast Environmental Research Program, Florida International University, 33199, Miami, Florida

Authors and Affiliations

  1. Tiburon Center for Environmental Studies, San Francisco State University, P.O. Box 855, 94920, Tiburon, California

    R. M. Chambers, J. W. Fourqurean & J. T. Hollibaugh

  2. Department of Oceanography, University of Hawaii, 96822, Honolulu, Hawaii

    S. M. Vink

Authors
  1. R. M. Chambers
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  2. J. W. Fourqurean
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  3. J. T. Hollibaugh
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  4. S. M. Vink
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Chambers, R.M., Fourqurean, J.W., Hollibaugh, J.T. et al. Importance of terrestrially-derived, particulate phosphorus to phosphorus dynamics in a west coast estuary. Estuaries 18, 518–526 (1995). https://doi.org/10.2307/1352369

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  • DOI: https://doi.org/10.2307/1352369

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