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Soil Aluminum Distribution in the Near-Stream Zone at the Bear Brook Watershed in Maine |
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| Authors: | BA Pellerin IJ Fernandez SA Norton JS Kahl |
| Institution: | 2. Department of Natural Resources, University of New Hampshire, Durham, NH, 03824, U.S.A.) 1. University of Maine, Department of Plant, Soil and Environmental Sciences, Orono, ME, 04469, U.S.A. 3. Department of Geological Sciences, University of Maine, Orono, ME, 04469, U.S.A 4. Water Research Institute, University of Maine, Orono, ME, 04469, U.S.A |
| Abstract: | Near-stream and upslope soil chemical properties were analyzed to infer linkages between soil and surface water chemistry atthe Bear Brook Watershed in Maine BBWM]. Organic and mineral soil samples were collected along six 20 m transects perpendicular to the stream and one 200 m transect parallel tothe stream. O horizon soils immediately adjacent to the streamhad a significantly higher pH (4.20) and lower soil organic matter percentage (54%) than upslope O horizons (3.84 and 76%,respectively). Additionally, near-stream O horizon soils hadsignificantly higher concentrations of water-soluble Al (2.7 ×),exchangeable Al (2.3 ×), and organically-bound Al (3.9 ×) andsignificantly lower concentrations of exchangeable Ca (0.4 ×) than O horizons upslope. These results suggest that Al can accumulate in non-hydric near-stream zone soils at this site. Mobilization of labile Al from near-stream zone soils duringhydrologic events could play a key role in explaining controls on Al in stream water at BBWM. |
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