Publication Details

Mercury budget of an upland-peatland watershed

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Grigal, D. F.; Kolka, Randy K.; Fleck, J. A.; Nater, E. A.

Year Published

2000

Publication

Biogeochemistry. Vol. 50 p. 95-109. (2000)

Abstract

Inputs, outputs, and pool sizes of total mercury (Hg) were measured in a forested 10 ha,watershed consisting of a 7 ha hardwood-dominated upland surrounding a 3 ha coniferdominated peatland. Hydrologic inputs via throughfall and stemflow, 13 +/- 0.4/ug m-2 yr-1 over the entire watershed, were about double precipitation inputs in the open and were significantly higher in the peatland than in the upland (19.6 vs. 9.8/ug m-2 yr-1). Inputs of Hg via litterfall were 12.3 +/- 0.7/ug m-2 yr-1,/sup> , not different in the peatland and upland (11.7 vs. 12.5 ug m-2 yr-1). Hydrologic outputs via streamflowwere 2.8 +/- 0.3/ug m-2 yr-1 and the contribution from the peatland was higher despite its smaller area. The sum of Hg inputs were less than that in the overstory trees, 33+/-3 ug m-2 above-ground, and much less than either that in the upland soil, 5250+/-520ug m-2, or in the peat, 3900+/-100ug m-2 in the upper 50cm. The annual flux of Hg measured in streamflow and the calculated annual accumulation in the peatland are consistent with values reported by others. A sink for Hg of about 20ug m-2 yr-1 apparently exists in the upland, and could be due to either or both storage in the soil or volatilization.

Keywords

atmospheric deposition, litterfall, mercury cycling, wetland, throughfall

Citation

Grigal, D. F.; Kolka, Randy K.; Fleck, J. A.; Nater, E. A. 2000. Mercury budget of an upland-peatland watershed. Biogeochemistry. Vol. 50 p. 95-109. (2000)

Last updated on: August 11, 2006