Table 2.
Fraction of soil C stock (0- to 15-cm mineral soil) and respiration flux (first sampling) coming from pre-FACE (>10 y) C (±SEM) identified with 14C and 13C mixing models
| Respiration |
||||
| Stock (f>10 y by 13C) | Temperature (°C) | f>10 y by 14C | f>10 y by 13C | |
| Duke | ||||
| CO2 ambient | 15 | 0.33 (0.10) | ||
| CO2 ambient | 25 | 0.31 (0.15) | ||
| CO2 ambient | 35 | 0.27 (0.12) | ||
| CO2 elevated | 0.62 (0.03) | 15 | 0.29 (0.16) | 0.38 (0.15) |
| CO2 elevated | 25 | 0.24 (0.16) | 0.28 (0.07) | |
| CO2 elevated | 35 | 0.28 (0.22) | 0.42 (0.06) | |
| Aspen | ||||
| CO2 ambient | 5 | 0.40 (0.31) | ||
| CO2 ambient | 15 | 0.34 (0.13) | ||
| CO2 ambient | 25 | 0.35 (0.12) | ||
| CO2 elevated | 0.68 (0.07) | 5 | 0.28 (0.12) | 0.43 (0.21) |
| CO2 elevated | 15 | 0.27 (0.08) | 0.44 (0.09) | |
| CO2 elevated | 25 | 0.28 (0.10) | 0.37 (0.11) | |