Table 1.
Site, climatic, overstory, and ambient nitrogen deposition rates of four study sites receiving experimental N additions.
| Characteristic | Site A | Site B | Site C | Site D |
|---|---|---|---|---|
| LOCATION | ||||
| Latitude (N) | 46°52” | 45°33” | 44°23” | 43°40” |
| Longitude (W) | 88°53” | 84°52” | 85°50” | 86°9” |
| CLIMATE | ||||
| Mean annual temperature (°C) | 4.8 | 6.1 | 6.5 | 7.7 |
| Mean annual precipitation (cm) | 91.9 | 93.3 | 92.8 | 86.6 |
| Ambient N Deposition (Kg N ha−1 year−1) | 5.9 | 6.1 | 7.4 | 7.4 |
| VEGETATION | ||||
| Overstory biomass (Mg ha−1) | 261 | 261 | 274 | 234 |
| Acer saccharum biomass (Mg ha−1) | 237 | 224 | 216 | 201 |
| ENVIRONMENT | ||||
| Leaf Litter (Oe/Oa horizons) | ||||
| Litter C:N | 63.7 | 57.1 | 52.9 | 43.4 |
| Litter mass (g) | 412 | 396 | 591 | 550 |
| Soil (0–10 cm) | ||||
| Sand (%) | 85 | 89 | 89 | 87 |
| pH (1:1 soil/H2O) | 4.8 | 5.0 | 4.5 | 4.7 |
| Base saturation, % | 71 | 96 | 73 | 80 |
Data represent site, climatic, overstory, and ambient nitrogen deposition rates of four study sites receiving experimental N additions. Reprinted by Permission, ASA, CSSA, SSSA.