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SOIL ALUMINUM DISTRIBUTION IN THE NEAR-STREAM ZONE AT THE BEAR BROOK WATERSHED IN MAINE
Citation:
PELLERIN, B. A., I. J. FERNANDEZ, S. A. NORTON, AND J. S. KAHL. SOIL ALUMINUM DISTRIBUTION IN THE NEAR-STREAM ZONE AT THE BEAR BROOK WATERSHED IN MAINE. WATER, AIR, AND SOIL POLLUTION. Springer, New York, NY, 134:189-204, (2002).
Impact/Purpose:
To link soil chemical properties and surface water chemistry
Description:
Near-stream and upslope soil chemical properties were analyzed to infer linkages between soil and surface water chemistry at the 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.