Table 7 Test results for random effects meta-analyses for five intervention/exposure categories with sufficient data
Intervention/exposure-vs-comparator | Measured outcome | No. studies | SEE1 | SE | Lower 95% CI | Upper 95% CI | Description | p-value* | T2(±SE) | Test for Heterogeneity; Q(df), p-value |
|---|---|---|---|---|---|---|---|---|---|---|
Drained-vs-undrained | NEE | 3 | 116 | 161 | −200 | 431 | Greater in drained | 0.473 | 7.40x103 (±77.8x103) | 85.3(2), <0.001 |
Reco | 10 | 125 | 60.2 | 6.71 | 243 | Greater in drained | 0.038* | 31.1x103 (±16.9x103) | 150(9), <0.001 | |
CH4 | 9 | −0.126 | 0.066 | −0.254 | 0.003 | Greater in undrained | 0.055 | 0.000 (±0.016) | 12.8(8), 0.119 | |
N2O | 5 | 0.008 | 0.004 | 0.001 | 0.016 | Greater in drained | 0.033* | 0.000 (±0.0001) | 2.33(4), 0.676 | |
DOC | 5 | 27.3 | 14.0 | −0.099 | 54.7 | Greater in drained | 0.051 | 839 (±677) | 134(4), <0.001 | |
Dry-vs-wet | N2O | 3 | 0.221 | 0.103 | 0.019 | 0.424 | Greater in dry | 0.032* | 0.018 (±0.032) | 5.46(2), 0.065 |
Grazed-vs-mown | CH4 | 3 | −5.39 | 4.40 | −14.0 | 3.23 | Greater in grazed | 0.220 | 44.4 (±58.8) | 8.71(2), 0.013 |
Restored-vs-unrestored | Reco | 3 | 48.7 | 104 | −155 | 253 | Greater in restored | 0.640 | 20.0x103 (±33.7x103) | 5.89(2), 0.053 |
CH4 | 4 | 0.248 | 0.101 | 0.052 | 0.446 | Greater in restored | 0.014* | 0.000 (±0.053) | 1.18(3), 0.759 | |
DOC | 6 | 15.6 | 11.6 | −7.20 | 38.3 | Greater in restored | 0.180 | 622 (±497) | 26.1(5), <0.001 | |
High intensity farmed-vs-low intensity farmed | CH4 | 4 | −0.004 | 0.004 | −0.011 | 0.004 | Greater in low intensity farmed | 0.349 | 0.000 (±0.0003) | 3.51(3), 0.314 |
N2O | 5 | 0.143 | 0.100 | −0.053 | 0.340 | Greater in high intensity farmed | 0.153 | 0.043 (±0.035) | 18.0(4), 0.001 |