Table 2.
Soil nitrogen (Total N) and soil organic carbon (SOC) concentration under elevated CO2 and O3 treatments in the rhizosphere and bulk soil during the 2008 growing season. Values in parentheses are standard errors (n = 12). Means followed by the same letter within a column are not statistically different (P > 0.05).
| Treatment | Total N (g N kg−1 soil) |
SOC (g C kg−1 soil) |
||
|---|---|---|---|---|
| Rhizosphere | Bulk | Rhizosphere | Bulk | |
| Ambient | 1.76 (0.09) B | 1.83 (0.07) B | 19.66 (1.14) B | 20.86 (1.00) B |
| Elevated CO2 | 1.82 (0.06) B | 1.83 (0.05) B | 20.45 (1.18) B | 20.48 (0.84) B |
| Elevated O3 | 2.07 (0.06) A | 2.06 (0.08) A | 24.25 (1.27) A | 23.91 (0.99) A |
| Elevated CO2 + O3 | 2.01 (0.05) A | 2.01 (0.06) A | 22.89 (0.91) A | 22.9 (0.82) A |