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Hydrologic Cycling of Mercury and Organic Carbon in a Forested Upland–Bog Watershed

^a Dep. of Forestry, Univ. of Kentucky, Lexington, KY 40546
^b Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108
^c USDA Forest Service, N.C. Forest Experiment Station, Grand Rapids, MN 55744

View larger version (21K): [in a new window]   Fig. 1. Mass balance model of the hydrological components of an upland–peatland watershed

View larger version (32K): [in a new window]   Fig. 2. Schematic of the S2 watershed at the Marcell Experimental Forest

View larger version (20K): [in a new window]   Fig. 3. Throughfall and stemflow flux of total Hg (HgT) and dissolved organic C (DOC) in the S2 watershed and precipitation in a nearby opening in 1995. Watershed is an areal weighted average. Error bars are standard errors

View larger version (16K): [in a new window]   Fig. 4. Monthly flow volumes for the S2 watershed in 1995

View larger version (22K): [in a new window]   Fig. 5. Mean monthly concentrations of total Hg (HgT) and organic C (OC) in (a) upland surface runoff, (b) interflow, (c) bog runoff, and (d) streamflow for the S2 watershed in 1995. TOC, total organic C; DOC, dissolved organic C; POC, particulate organic C; HgT, total Hg

View larger version (28K): [in a new window]   Fig. 6. Monthly fluxes of total Hg (HgT) and organic C (OC) in (a) upland surface runoff, (b) upland interflow, and (c) bog runoff for the S2 watershed in 1995. Mean annual concentrations of HgT and OC were applied to bog flows in March, April, November, and December to estimate fluxes for those months

View larger version (28K): [in a new window]   Fig. 7. Relationships between mean monthly total Hg (HgT) and particulate organic C (POC) concentration in (a) upland surface runoff, (b) upland interflow, (c) bog flow, and (d) streamflow for the S2 watershed

View larger version (22K): [in a new window]   Fig. 8. Monthly comparison of total Hg (HgT), dissolved organic C (DOC), and particulate organic C (POC) influxes to the (a) lagg and those fluxes in (b) streamflow