Table 10. Soil characteristics for each soil slice by ecoregion (n = 30), with average values provided (s.d. in parentheses).
Note that only reference sites are reported for the Southern Coastal Plain
| Ecoregion and slice letter | Depth from surface (mm) | Bulk density (g cm−3) | Total phosphorus (mg g−1 soil) | Organic matter (%) | Nitrogen (%) |
|---|---|---|---|---|---|
| Erie Drift Plain | |||||
| A | 0–20 | 0.31 (0.24) | 0.576 (0.305) | 33.8 (13.8) | 1.4 (0.6) |
| B | >20–40 | 0.34 (0.21) | 0.596 (0.373) | 31.7 (14.6) | 1.4 (0.5) |
| C | >40–60 | 0.39 (0.23) | 0.579 (0.510) | 28.8 (15.2) | 1.2 (0.5) |
| D | >60–80 | 0.50 (0.33) | 0.723 (0.687) | 25.7 (16.2) | 1.1 (0.5) |
| E | >80–100 | 0.50 (0.35) | 0.712 (0.723) | 26.2 (18.8) | 1.0 (0.6) |
| Middle Atlantic Coastal Plain | |||||
| A | 0–20 | 0.56 (0.36) | 0.109 (0.063) | 23.3 (15.1) | 0.7 (0.3) |
| B | >20–40 | 0.70 (0.29) | 0.054 (0.031) | 10.3 (8.4) | 0.3 (0.2) |
| C | >40–60 | 0.90 (0.20) | 0.029 (0.013) | 5.0 (3.4) | 0.2 (0.2) |
| D | >60–80 | 1.08 (0.18) | 0.022 (0.012) | 2.4 (2.2) | 0.1 (<0.1) |
| E | >80–100 | 1.19 (0.10) | 0.016 (0.007) | 1.3 (1.2) | 0.6 (0.7) |
| Southern Coastal Plain | |||||
| A | 0–20 | 0.17 (0.06) | 0.429 (0.239) | 57.0 (15.5) | 1.8 (0.6) |
| B | >20–40 | 0.26 (0.20) | 0.325 (0.212) | 44.0 (21.6) | 1.5 (0.8) |
| C | >40–60 | 0.41 (0.32) | 0.225 (0.203) | 32.5 (25.7) | 1.3 (0.9) |
| D | >60–80 | 0.48 (0.33) | 0.204 (0.212) | 28.4 (22.6) | 1.2 (0.9) |
| E | >80–100 | 0.55 (0.40) | 0.176 (0.207) | 25.1 (21.5) | 1.2 (0.9) |