Table 1 Methane content in low-level air and soil-adsorbed gas.
From: Sources of seasonal wetland methane emissions in permafrost regions of the Qinghai-Tibet Plateau
Absorption methane content (ppm) | Absorbed heavy hydrocarbon content (ppm) | Absorption dryness coefficient (nodim) | Base air methane content (ppm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Spring | Summer | Autumn | Spring | Summer | Autumn | Spring | Summer | Autumn | Spring | Summer | Autumn | |
No. of samples | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 |
Maximum value | 7272.98 | 3958.93 | 3470.45 | 4.83 | 28.95 | 9.38 | 2477.27 | 1556.48 | 421.12 | 7.94 | 5.34 | 3.29 |
Minimum value | 3.98 | 7.17 | 3.00 | 0.68 | 1.24 | 0.29 | 2.29 | 3.22 | 3.24 | 1.64 | 3.15 | 2.24 |
Mean | 736.73 | 465.04 | 256.89 | 2.26 | 3.77 | 1.99 | 241.39 | 150.76 | 49.45 | 3.02 | 4.17 | 2.82 |
Median | 8.49 | 11.22 | 5.97 | 2.13 | 3.21 | 1.09 | 9.74 | 7.67 | 9.26 | 2.92 | 4.22 | 2.85 |
Standard deviation | 1682.34 | 903.90 | 756.36 | 1.20 | 4.19 | 2.09 | 549.64 | 312.49 | 106.27 | 0.88 | 0.45 | 0.27 |
Coefficient of variation | 228.35% | 194.37% | 294.43% | 52.99% | 111.31% | 105.17% | 227.70% | 207.27% | 214.91% | 29.00% | 10.89% | 9.62% |
