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Soil Solution Chemical Response to Two Decades of Experimental Acidification at the Bear Brook Watershed in Maine

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Abstract

We examined long-term changes in soil solution chemistry associated with experimental, whole watershed-acidification at the Bear Brook Watershed in Maine (BBWM). At BBWM, the West Bear (WB) watershed has been treated with bimonthly additions of ((NH4)2 SO4) since 1989. The adjacent East Bear (EB) watershed serves as a biogeochemical reference. Soil solution chemistry in the EB watershed was relatively stable from 1989–2007, with the exception of declining SO4–S concentrations associated with a progressive decline in SO4–S deposition during this period. Soil solution chemistry in WB reflected a progressive change in acid-neutralization mechanisms from base cation buffering to Al buffering associated with treatment during this period. Total dissolved Al concentrations progressively increased over time and were ~4× higher in 2007 than in 1989. Treatment of WB was also associated with long-term increases in soil solution H+, SO4–S, and NO3–N, whereas soil solution dissolved organic carbon (DOC) was unresponsive to treatment. For solutes such as Ca, H+, and SO4–S, changes in stream chemistry were generally parallel to changes in soil solution chemistry, indicating a close coupling of terrestrial and aquatic processes that regulate the chemistry of solutions in this first-order stream watershed. For other solutes such as Al and DOC, solute concentrations were higher in soil solutions compared with streams, suggesting that sorption and transformation processes along hydrologic flow-paths were important in regulating the chemistry of solutions and the transport of these solutes.

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Acknowledgments

We would like to thank the individuals and funding agencies that helped make this research possible. A special thanks to Cheryl Spencer for providing field and laboratory assistance. We also thank the laboratory and field staff, including the University of Maine Sawyer Environmental Chemistry Research Laboratory, John Cangelosi, Karen Small, Mary Beth Parent, Benjamin Lynch, and Anthony Drouin. Kevin Simon and Bryan Dail provided helpful comments to improve this manuscript. This research was funded, in part, by the Maine Agricultural and Forest Experiment Station and the U.S. National Science Foundation (DEB-0415348 and DEB-0210257). Graduate research fellowship support for this project was provided by the University of Maine Graduate School and the New England Farm and Garden Association. This manuscript has not been subject to agency or corporate review, and no endorsements should be inferred. This is Maine Agricultural and Forest Experiment Station Publication #2618.

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Correspondence to Farrah R. Fatemi.

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Fatemi, F.R., Fernandez, I.J., Szillery, J. et al. Soil Solution Chemical Response to Two Decades of Experimental Acidification at the Bear Brook Watershed in Maine. Water Air Soil Pollut 223, 6171–6186 (2012). https://doi.org/10.1007/s11270-012-1348-5

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