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This article in SSSAJ

  1. Vol. 52 No. 6, p. 1789-1792
     
    Received: July 9, 1987
    Published: Nov, 1988


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doi:10.2136/sssaj1988.03615995005200060049x

Solution Parameters Influencing Dissolved Organic Carbon Levels in Three Forest Soils

  1. A. Evans ,
  2. L. W. Zelazny and
  3. C.E. Zipper
  1. Dep. of Agronomy and Soils, Clemson Univ., Clemson, SC 29634
    Dep. of Agronomy, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061

Abstract

Abstract

A column study was conducted using selected horizons from three soils that were leached with pH 4.8 solutions containing either SO2−4 (0–0.208 mmol L−1) or NO3 (0–0.16 mmol L−1) at various ionic strengths (0.2–2.53 mmol L−1). The quantity of dissolved organic C (DOC) release into the soil solution decreased with increasing ionic strength, with DOC levels remaining constant for ionic strengths > 1.10 mmol L−1. The addition of SO2−4 (0–0.208 mmol L−1) to the leaching solution resulted in elevated DOC levels over a wider range of ionic strengths, while DOC levels increased substantially for NO3 additions only at conditions of low ionic strength <0.5 mmol L−1 and higher NO3 concentrations > 0.048 mmol L−1. The portion of total measurable DOC attributed to anion source, compared to that of ionic strength, was observed to increase under conditions of low ionic strength and high anion concentration. Results suggest that anion composition and ionic strength may regulate DOC levels in solution.

Contribution no. 2878 of the South Carolina Agric. Exp. Stn., Clemson Univ.

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