Table 1 Estimates of the effect size (log response ratios) of SOC content influenced by shrub encroachment for different variable classes across climate class, shrub type, soil texture and soil depth with 95% confidence intervals (CI).
From: Effects of shrub encroachment on soil organic carbon in global grasslands
Variable class | n | Effect size | CI | p |
|---|---|---|---|---|
Climate class | ||||
Arid | 20 | 0.029 | −0.048~0.11 | 0.45 |
Semi-arid | 109 | 0.16 | 0.15~0.34 | <0.0001 |
Dry sub-humid | 3 | −0.0062 | −0.18~0.15 | 0.94 |
Humid | 11 | 0.45 | 0.34~0.54 | <0.0001 |
Shrub types | ||||
Genus level | ||||
Acacia | 6 | −0.40 | −0.69~−0.14 | <0.0001 |
Brachystegia | 3 | 1.09 | 0.67~1.46 | <0.0001 |
Callitris | 7 | −0.024 | −0.27~0.24 | 0.67 |
Caragana | 5 | -0.26 | −0.54~0.06 | 0.0011 |
Chuquiraga | 2 | −0.49 | −0.95~−0.02 | <0.0001 |
Cornus | 1 | 0.0028 | −0.66~0.66 | 0.98 |
Eucalyptus | 1 | −0.045 | −0.71~0.62 | 0.72 |
Juniperus | 9 | 0.16 | 0.11~0.58 | 0.00081 |
Larrea | 18 | 0.059 | −0.15~0.22 | 0.12 |
Mulinum | 1 | −0.11 | −0.78~0.56 | 0.43 |
Myrica | 3 | 1.22 | 1.16~1.86 | <0.0001 |
Prosopis | 33 | 0.61 | 0.49~0.73 | <0.0001 |
Quercus | 37 | 0.037 | 0.06~0.31 | 0.23 |
Rosmarinus | 5 | 0.21 | −0.08~0.53 | 0.035 |
Symphoricarpos | 11 | −0.12 | −0.32~0.10 | 0.024 |
Family level | ||||
Leguminosae | 84 | 0.21 | 0.17~0.27 | <0.0001 |
Non-Leguminosae | 58 | 0.081 | 0.033~0.13 | 0.0008 |
Soil texture | ||||
Clay loam | 3 | −0.045 | −0.29~0.21 | 0.72 |
Loam | 33 | 0.075 | −0.03~0.15 | 0.058 |
Sand | 4 | 0.42 | 0.27~0.58 | <0.0001 |
Sandy clay loam | 25 | 0.59 | 0.50~0.67 | <0.0001 |
Silt | 5 | 0.034 | −0.095~0.16 | 0.61 |
Silty clay | 4 | −0.44 | −0.59~−0.30 | <0.0001 |
Silty clay loam | 3 | 0.13 | −0.18~0.44 | 0.40 |
Silty loam | 4 | 0.22 | −0.042~0.47 | 0.098 |
Sandy loam | 36 | 0.19 | 0.13~0.24 | <0.0001 |
Soil depth | ||||
0–15 cm | 76 | 0.20 | 0.15~0.24 | 0.0023 |
15–30 cm | 66 | 0.073 | 0.026~0.16 | <0.0001 |
Overall | 142 | 0.15 | 0.11~0.18 | <0.0001 |
