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Stoichiometry of C, N, P, and Si fluxes in a temperate-climate embayment

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https://ir.library.oregonstate.edu/concern/articles/t148fn75n

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Abstract
  • Dissolved C, N, P, and Si budgets for Tomales Bay, California, have been used to solve simultaneous stoichiometric equations which describe a plausible material balance for net organic matter reactions in the bay. Dissolved Si and P were both exported hydrographically. Dissolved C and fixed N were imported hydrographically. If we assume that C, N, P, and Si were supplied to the bay as organic detritus and remineralized at a rate required to balance dissolved Si and P exports, we can calculate reasonable rates of denitrification and CO2 gas evasion across the air-water interface. The system is thus interpreted to have been net heterotrophic at the time of our investigation. Fluxes attributed to individual components in the system (benthic respiration, water-column material turnover, biochemical transformations between fixed and gaseous N) were of sufficient magnitude to account for the system-wide net fluxes, although too noisy to allow piecewise derivation of net system fluxes. Denitrification and limitation of primary production by dissolved fixed N in aquatic ecosystems may be symptoms of other system-scale constraints on net C metabolism, rather than themselves being system-level controls of net C metabolism.
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  • 45
Table of Contents
  • 1) Introduction.2) Study Site – Tomales Bay.3) Experimental Design.4) Materials and Methods (Hydrographic studies; Benthic flux studies; Primary productivity; Water-column N and P cycling; Nitrogenfixation-denitrification studies).5) Results (Hydrographic data; Budgetary calculations; Stoichiometric implications of the biogeochemical budgets; Sediment nutrient fluxes; Water-column primary production; Water-column N and P cycling; Biochemical nitrogen transformation reactions). 6) Discussion
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  • The research was sponsored by NSF Grant Nos. OCE 85-00679 (awarded to SVS) and OCE 82-14837 (awarded to JTH).
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  • 0022-2402

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