A simulation model of sulfur transformations in forested Spodosols

R. D. Fuller, C. T. Driscoll, S. C. Schindler, M. J. Mitchell

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Transformations of organic and inorganic S in two forested Spodosols from the Hubbard Brook Experimental Forest, New Hampshire and the Huntington Forest in the Adirondack Mts. of New York were investigated using laboratory35SO42- incorporation experiments. Sulfur transformations were modeled as a set of three reversible, first-order reactions in which soluble SO42- is converted to adsorbed SO42-, ester sulfate and carbon-bonded S. Reaction rate contants for35SO42- adsorption/desorption and immobilization reactions involving ester sulfate and carbon-bonded S were determined using a fifth order Runge-Kutta-Fehlberg integration routine combined with least squares fitting. Model simulations were able to account for over 93% of the variation in the distribution of35S in S fractions. A hypothetical application of immobilization rate constants to field situations at the Hubbard Brook Experimental Forest suggests that large quantities of S cycle through organic forms in Northern Hardwood Forest Ecosystems.

Original languageEnglish (US)
Pages (from-to)313-328
Number of pages16
Issue number4
StatePublished - Dec 1986


  • first-order
  • immobilization
  • kinetics
  • michaelis-menten
  • mineralization
  • reaction rates
  • soil adsorption
  • soil organic sulfur
  • sulfate

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes


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