Biogeochemistry

, Volume 44, Issue 3, pp 281–299 | Cite as

Sources of stream sulfate at the Hubbard Brook Experimental Forest: Long-term analyses using stable isotopes

  • C. Alewell
  • M. J. Mitchell
  • G. E. Likens
  • H. R. Krouse
Article

Abstract

Sulfur deposition in the northeastern U.S. has been decreasing since the 1970s and there has been a concomitant decrease in the SO 4 2− lost from drainage waters from forest catchments of this region. It has been established previously that the SO 4 2− lost from drainage waters exceeds SO 4 2− inputs in bulk precipitation, but the cause for this imbalance has not been resolved. The use of stable S isotopes and the availability of archived bulk precipitation and stream water samples at the Hubbard Brook Experimental Forest (HBEF) in New Hampshire provided a unique opportunity to evaluate potential sources and sinks of S by analyzing the long-term patterns (1966–1994) of the δ34S values of SO 4 2− . In bulk precipitation adjacent to the Ecosystem Laboratory and near Watershed 6 the δ34S values were greater (mean: 4.5 and 4.21, respectively) and showed more variation (variance: 0.49 and 0.30) than stream samples from Watersheds 5 (W5) and 6 (W6) (mean: 3.2 and 3.7; variance: 0.09 and 0.08, respectively). These results are consistent with other studies in forest catchments that have combined results for mass balances with stable S isotopes. These results indicate that for those sites, including the HBEF, where atmospheric inputs are ≤10 kg S ha−1 yr−1, most of the deposited SO 4 2− cycles through the biomass before it is released to stream water. Results from W5, which had a whole-tree harvest in 1983–1984 showed that adsorption/desorption processes play an important role in regulating net SO 4 2− retention for this watershed-ecosystem. Although the isotopic results suggest the importance of S mineralization, conclusive evidence that there is net mineralization has not yet been shown. However, S mass balances and the isotopic result are consistent with the mineralization of organic S being a major contributor to the SO 4 2− in stream waters at the HBEF.

Key words

isotopes mass balances precipitation sulfur watersheds 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • C. Alewell
    • 1
  • M. J. Mitchell
    • 1
  • G. E. Likens
    • 2
  • H. R. Krouse
    • 3
  1. 1.College of Environmental Science and ForestryS.U.N.Y.SyracuseUSA
  2. 2.Institute of Ecosystem StudiesMillbrookUSA
  3. 3.Department of Physics and AstronomyThe University of CalgaryCalgaryCanada

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