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Experimental Acidification Causes Soil Base-Cation Depletion at the Bear Brook Watershed in Maine

^a Dep. of Plant, Soil, and Environmental Sciences, Univ. of Maine, Orono, ME 04469
^b USDA Forest Service, Northeastern Experiment Station, Durham, NH 03824
^c Dep. of Geological Sciences, Univ. of Maine, Orono, ME 04469
^d Senator George J. Mitchell Center for Env. & Watershed Research, Univ. of Maine, Orono, ME 04469
^e Dep. of Environmental Sciences, University of Virginia, Charlottesville, VA 22904

View larger version (36K): [in a new window]   Fig. 1. Stream Ca and Mg concentrations in East and West Bear streams from weekly collections at the weirs over the study period.

View larger version (24K): [in a new window]   Fig. 2. Conceptual model for the evolution of stream Ca concentrations and soil base saturation (BSe%) through both response and recovery when exposed to elevated atmospheric deposition of nitrogen and sulfur. BC+ and BC- indicate a relative increase or decrease in base cations from the starting equilibrium for either stream concentrations or soil exchangeable concentrations. See text for explanation of Roman numerals.

View larger version (22K): [in a new window]   Fig. 3. Progression of stream Ca and Mg concentrations relative to each other over the study period for East and West Bear streams.

View larger version (49K): [in a new window]   Fig. 4. Annual stream Ca and Mg export (paired bars), and cumulative excess export in West Bear compared to East Bear (line), over the study period.

View larger version (20K): [in a new window]   Fig. 5. Soil exchangeable Ca and Mg pools (kg ha-1) in East and West Bear watersheds showing the contributions of O and underlying mineral soil horizons. Differences between watersheds are significant for total exchangeable Ca and Mg.