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Lead Reduction and Redistribution in the Forest Floor in New Hampshire Northern Hardwoods

^a SUNY College of Environmental Science and Forestry, Syracuse, NY 13210
^b Woods Hole Research Center, Woods Hole, MA 02543
^c Yale Univ., New Haven, CT 06511

View larger version (27K): [in a new window]   Fig. 1. (a) Lead content, (b) concentration of Pb per unit organic matter, and (c) organic matter content of the forest floor as a function of stand age in three stands at the HBEF, six stands at the BEF, and seven stands elsewhere in the WMNF. At HBEF, W6 was sampled seven times, W1 was sampled three times, and W5 was sampled once. Lead content of W6 = 1.78 g m–2 to 0.0118 g m–2 yr–1 x age (yr).

View larger version (43K): [in a new window]   Fig. 2. Change over time in (a) Pb content (HBEF, Oie r2 = 0.91, p < 0.001, OaA r2 = 0.17, p = 0.74; BEF, Oie r2 = 0.55, p = 0.004, OaA r2 = 0.10, p = 0.90); (b) Pb concentration (HBEF, Oie r2 = 0.99, p < 0.001, OaA r2 = 0.07, p = 0.47; BEF, Oie r2 = 0.72, p < 0.001, OaA r2 = 0.21, p = 0.08); and (c) organic mass (HBEF, Oie r2 = 0.54, p = 0.04, OaA r2 = 0.07, p = 0.29; BEF, Oie r2 = 0.10, p = 0.86, OaA r2 = 0.06, p = 0.56) of Oie and Oa-A horizons at Hubbard Brook and Bartlett Experimental Forests.

View larger version (24K): [in a new window]   Fig. 3. Changes within stand in (a) Pb content, (b) Pb concentration, and (c) organic mass by horizon at Bartlett Experimental Forest measured in 1980 and 1995, plotted as a function of stand age.

View larger version (34K): [in a new window]   Fig. 4. Elevational patterns in (a) Pb content, (b) Pb concentration, and (c) organic mass of the forest floor in HBEF W-6 for seven sampling dates: 1976, 1977, 1978, 1982, 1987, 1992, and 1997.

View larger version (27K): [in a new window]   Fig. 5. Forest floor Pb content as a function of elevation for 32 stands reported by Johnson et al. (1982) and the 16 stands reported in this study.