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Journal of Environmental Quality Abstract -

Carbon Flux between Sediment and Water Column of a Shallow, Subtropical, Hypereutrophic Lake


This article in JEQ

  1. Vol. 23 No. 5, p. 965-972
    Received: Aug 16, 1993

    * Corresponding author(s):
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  1. P. M. Gale * and
  2. K. R. Reddy
  1. Soil and Water Science Dep., P.O. Box 110510, Univ. of Florida, Institute of Food and Agric. Science, Gainesville, FL 32611.



Field and laboratory experiments were conducted to measure forms, storages, and flux of C in the water-sediment colunm of a shallow, subtropical, hypereutrophic lake. High gross primary productivity in the lake (1.4 ± 0.3 kg C m−2 yr−1) was not significantly correlated with any water chemistry parameters measured. This suggested that the phytoplankton community was functioning at maximum levels and under nutrient nonlimiting conditions. Major C input to the lake is through gross primary productivity, of which 90% is lost through heterotrophic and microbial respiration processes within the water column. Resuspension of the bottom sediments was a major input of C into the water column, contributing 720 g C m−2 yr−1. In comparison, diffusive flux of dissolved organic C from the sediment was minimal (1.2 g C m−2 yr−1), as were external inputs into the water column (20 g C m−2 yr−1). High productivity of this system has resulted in a net accumulation of C (as sediments) of 118 g C m−2 yr−1.

Contribution of the Florida Agric. Exp. Stn. Journal Ser. no. R-03291.

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