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Calcium Depletion in a Southeastern United States Forest Ecosystem

^a U.S. Geological Survey, 3039 Amwiler Rd. Suite 130, Atlanta, GA 30360 USA
^b U.S. Geological Survey, 10 Bearfoot Rd., Northborough, MA 01532 USA
^c Dep. of Civil Engineering, 220 Hinds Hall, Syracuse Univ., Syracuse, NY, 220 Hinds Hall, Syracuse, NY 13244 USA
^d Dep. of Biology, Emory Univ., Atlanta, GA 30322 USA
^e U.S. Geological Survey, 3215 Marine St., Boulder, CO 80303 USA

View larger version (54K): [in a new window]   Fig. 1 Panola Mountain Research Watershed site map showing soil series, water, soil, and precipitation sampling sites and streams

View larger version (19K): [in a new window]   Fig. 2 Box plot showing Ca concentration mean, quartiles, deciles, and outliers in groundwater (GW), soil water (VW), and streamwater (SW) at various stations in the Panola Mountain Research Watershed, Georgia

View larger version (31K): [in a new window]   Fig. 3 Schematic showing pools and fluxes of Ca at the Panola Mountain Research Watershed

View larger version (19K): [in a new window]   Fig. 4 Distribution of soil exchangeable Ca pool vs. soil Ca depletion rate for Panola Mountain Research Watershed and several other intensively studied sites in the southeastern USA. American beech, Fagus grandifolia Ehrh. (A) (Johnson and Lindberg, 1992); chestnut oak, Quercus prinus L. (B) (Johnson and Todd, 1990); mixed conifer and southern hardwood (C) (Johnson and Todd, 1990); Quercus–Carya spp. (D) (Johnson and Todd, 1990); Quercus spp. (E) (Rick Web, Univ. of Virginia, 1995, personal communication); loblolly pine, Pinus taeda L. (F) (Richter et al., 1994); mixed southern hardwood (G) (Johnson and Lindberg, 1992); P. taeda (H) (Huntington, 1996); P. taeda (I) (Johnson and Lindberg, 1992); mixed conifer and southern hardwood (J) (this study); P. taeda (K) (Johnson et al., 1988b); P. taeda (L) (Johnson and Lindberg, 1992); slash pine, P. elliotti Engelm. (M) (Johnson and Lindberg, 1992); eastern white pine, P. strobus L. (N) (Johnson and Lindberg, 1992); red spruce, Picea rubens Sarg. (O) (Johnson and Lindberg, 1992)