Table 1.
Descriptive statistics (arithmetic mean ± SD) of the experiments were included for analysis and descriptions of the use of the automated head chamber system (AHCS) and gas flux as influenced by visit duration thresholds (i.e., ≥ 3, ≥ 2, ≥ 1, or all visits)
| Visit duration thresholds | ||||
|---|---|---|---|---|
| Item1,2 | ≥3 min | ≥2 min | ≥1 min | All |
| Beck 2018 | ||||
| Dur. | 4.3 ± 0.44 | 4.0 ± 0.37 | 3.6 ± 0.35 | 2.6 ± 0.40 |
| Visit av. | 1.5 ± 0.15 | 1.7 ± 0.15 | 2.0 ± 0.18 | 3.0 ± 0.49 |
| Visits | 61.1 ± 16.02 | 77.6 ± 20.82 | 93.6 ± 24.51 | 150.4 ± 46.24 |
| CO2 | 7,143.3 ± 564.93 | 7,173.8 ± 568.92 | 7,201.6 ± 548.76 | 6,891.5 ± 454.37 |
| O2 | 5,230.6 ± 432.51 | 5,267.0 ± 437.75 | 5,288.3 ± 420.66 | 4,958.1 ± 403.55 |
| CH4 | 198.3 ± 22.54 | 194.9 ± 22.63 | 191.4 ± 21.04 | 151.00 ± 17.47 |
| Beck 2019 | ||||
| Dur. | 4.1 ± 0.39 | 3.8 ± 0.33 | 3.6 ± 0.38 | 2.9 ± 0.39 |
| Visit av. | 1.5 ± 0.25 | 1.6 ± 0.37 | 1.8 ± 0.47 | 2.5 ± 0.88 |
| Visits | 49.1 ± 17.63 | 64.1 ± 25.71 | 73.8 ± 31.48 | 106.9 ± 53.19 |
| CO2 | 6,067.5 ± 638.43 | 6,104.8 ± 643.30 | 6,091.0 ± 638.39 | 5,918.4 ± 604.65 |
| O2 | 4,461.6 ± 467.95 | 4,508.6 ± 475.26 | 4,508.8 ± 471.39 | 4,278.8 ± 464.70 |
| CH4 | 176.0 ± 23.16 | 176.1 ± 24.67 | 174.7 ± 25.60 | 148.8 ± 22.56 |
| Thompson | ||||
| Dur. | 3.7 ± 0.15 | 3.4 ± 0.19 | 3.4 ± 0.19 | 3.0 ± 0.22 |
| Visit av. | 1.6 ± 0.26 | 1.9 ± 0.27 | 2.0 ± 0.27 | 2.4 ± 0.50 |
| Visits | 51.3 ± 12.22 | 67.4 ± 10.16 | 70.5 ± 10.30 | 85.8 ± 18.08 |
| CO2 | 6,117.2 ± 387.38 | 6,118.5 ± 411.45 | 6,113.6 ± 404.05 | 5,983.9 ± 400.17 |
| O2 | 4,390.3 ± 325.51 | 4,399.2 ± 336.34 | 4,398.7 ± 332.80 | 4,175.6 ± 329.42 |
| CH4 | 169.5 ± 13.51 | 168.4 ± 13.52 | 167.0 ± 13.68 | 150.9 ± 15.03 |
| Proctor | ||||
| Dur. | 4.4 ± 0.56 | 4.1 ± 0.52 | 3.7 ± 0.54 | 2.7 ± 0.69 |
| Visit av. | 2.4 ± 0.58 | 2.7 ± 0.76 | 3.3 ± 1.12 | 4.9 ± 2.24 |
| Visits | 144.0 ± 55.01 | 173.3 ± 71.22 | 218.7 ± 104.70 | 342.0 ± 204.47 |
| CO2 | 9,860.5 ± 835.81 | 9,688.8 ± 804.05 | 9,465.2 ± 799.51 | 8,673.7 ± 750.93 |
| O2 | 6,706.4 ± 631.08 | 6,625.2 ± 653.94 | 6,439.9 ± 687.98 | 5,423.7 ± 732.61 |
| CH4 | 149.9 ± 33.00 | 148.5 ± 34.51 | 142.6 ± 36.12 | 116.1 ± 37.84 |
1Beck 2018 = Beck et al. (2018); Beck 2019 = Beck et al. (2019); Thompson = Thompson et al. (2019); Proctor = Proctor (2023).
2Dur. = Visit duration, minutes; visit av. = average visits per d; visits = number of visits to the AHCS; CO2 = carbon dioxide, g/d; O2 = oxygen consumption, g/d; CH4 = methane emissions, g/d.