Table 5.
Mean soil pH, soil organic carbon (%), and soil lead (ppm Pb), and areal extent (106 ha) for the national wetland population and the four NWCA Aggregated Ecoregions. 95% CI is reported with each mean. n-values (i.e., number of probability sites) on which areal extent is based are 874, 469, 151, 111, and 143, for the conterminous US, CPL, EMU, IPL and W, respectively
| NWCA Aggregated Ecoregion | Soil pH | Soil Organic Carbon (%) | Soil Lead(ppm Pb) | Extent(106 ha) |
|---|---|---|---|---|
| Conterminous US | 4.38 ± 0.10 | 17.17 ± 1.88 | 20.15 ± 1.73 | 23.48 ± 1.90 |
| Coastal Plains (CPL) | 4.26 ± 0.12 | 9.72 ± 1.71 | 17.95 ± 1.35 | 11.67 ± 1.35 |
| Eastern Mts & Upper Midwest (EMU) | 4.39 ± 0.18 | 33.50 ± 4.32 | 23.83 ± 4.08 | 7.96 ± 1.08 |
| Interior Plains (IPL) | 5.44 ± 0.47 | 6.39 ± 1.43 | 15.82 ± 1.46 | 2.38 ± 0.69 |
| West (W) | 5.75 ± 0.23 | 5.33 ± 1.46 | 24.81 ± 11.43 | 1.46 ± 0.34 |