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SULFUR DYNAMICS IN MINERAL HORIZONS OF TWO NORTHERN HARDWOOD SOILS A COLUMN STUDY WITH 35S
Citation:
Dhamala, B., M. Mitchell, AND A. Stam. SULFUR DYNAMICS IN MINERAL HORIZONS OF TWO NORTHERN HARDWOOD SOILS A COLUMN STUDY WITH 35S. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/012 (NTIS PB92139955), 1990.
Description:
Sulfur dynamics of two Spodosols were ascertained using soil columns constructed from homogenized mineral soil from northern hardwood ecosystems at the Huntington Forest (HF) in the Adirondack Mountains of New York and Bear Brook Watershed in Maine (BBWM). olumns were leached for 20 weeks with a simulated throughfall solution with 35SO42-. ulfur constituents were similar to those of other Spodosols with the organic fractions (C-bonded S and ester sulfate) constituting over 90% of total S. F soil columns had higher total S (14.9 umol S g-1) than that for the BBWM soil columns (7.4 umol g-1) primarily due to higher C-bonded S in the former. nalyses using both ass balances and radioisotopes corroborate that for BBWM soil columns, SO42- adsorption-desorption dominated the S biogeochemistry while in HF soil columns, organic S mineralization-immobilization processes were more important. It is suggested that similar techniques can be applied to soils in the field to ascertain the relative importance of SO42-2 adsorption processes and organic S dynamics.