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The Effect of Fire on Mercury Cycling in the Soils of Forested Watersheds: Acadia National Park, Maine, U.S.A.

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Abstract

This study compares mercury (Hg) and methylmercury (MeHg) distribution in the soils of two forested stream watersheds at Acadia National Park, Maine, U.S.A. Cadillac Brook watershed, which burned in 1947, has thin soils and predominantly deciduous vegetation. It was compared to the unburned Hadlock Brook watershed, with thicker soil and predominantly coniferous vegetation. Soils in both watersheds were primarily well drained. The fire had a significant impact on the Cadillac watershed, by raising the soil pH, altering the vegetation, and reducing carbon and Hg pools. Total Hg content was significantly higher (P > 0.05) in Hadlock soils (0.18 kg Hg ha-1) compared to Cadillac soils (0.13 kg Hg ha-1). Hadlock O horizon had an average Hg concentration of 134±48 ng Hg g-1 dry weight, compared to 103±23 ng Hg g-1 dry weight in Cadillac O horizon. Soil pH was significantly higher in all soil horizons at Cadillac compared to Hadlock soils. This difference was especially significant in the O horizon, where Cadillac soils had an average pH of 3.41±0.22 compared to Hadlock soils with an average pH of 2.99±0.13.To study the mobilization potential of Hg in the O horizons of the two watersheds, batch adsorption experiments were conducted, and the results were modeled using surface complexation modeling. The results of Hg adsorption experiments indicated that the dissolved Hg concentration was controlled by the dissolved organic carbon (DOC) concentration. The adsorption isotherms suggest that Hg is more mobile in the O horizon of the unburned Hadlock watershed because of higher solubility of organic carbon resulting in higher DOC concentrations in that watershed.Methylmercury concentrations, however, were consistently higher in the burned Cadillac O horizon (0.20±0.13 ng Hg g-1 dry weight) than in the unburned Hadlock O horizon (0.07±0.07 ng Hg g-1 dry weight). Similarly, Cadillac soils possessed a higher MeHg content (0.30 g MeHg ha-1) than Hadlock soils (0.16 g MeHg ha-1). The higher MeHg concentrations in Cadillac soils may reflect generally faster rates of microbial metabolism due to more rapid nutrient cycling and higher soil pH in the deciduous forest. In this research, we have shown that the amount of MeHg is not a function of the total pool of Hg in the watershed. Indeed, MeHg was inversely proportional to total Hg, suggesting that landscape factors such as soil pH, vegetation type, or land use history (e.g., fire) may be the determining factors for susceptibility to high Hg in biota.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Maine, Orono, ME, U.S.A. (author for correspondence

    Aria Amirbahman

  2. Department of Civil and Environmental Engineering, University of Maine, Orono, ME, U.S.A

    Philip L. Ruck

  3. Department of Plant, Soil and Environmental Sciences, University of Maine, Orono, ME, U.S.A

    Ivan J. Fernandez

  4. U.S.A

    Terry A. Haines

  5. U.S.A

    Jeffery S. Kahl

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  1. Aria Amirbahman
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  4. Terry A. Haines
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  5. Jeffery S. Kahl
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Amirbahman, A., Ruck, P.L., Fernandez, I.J. et al. The Effect of Fire on Mercury Cycling in the Soils of Forested Watersheds: Acadia National Park, Maine, U.S.A.. Water, Air, & Soil Pollution 152, 315–331 (2004). https://doi.org/10.1023/B:WATE.0000015369.02804.15

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