《Table 4 Correlation coefficients among restoration time, soil properties, root characteristics and

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《"Changes in soil properties and erodibility of gully heads induced by vegetation restoration on the Loess Plateau, China"》

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Note:RT，restoration time；CLA，clay content；SIL，silt content；SAN，sand content；BD，soil bulk density；STP，soil total porosity；SDR，soil disintegration rate；SHC，soil saturated hydraulic conductivity；SOM，soil organic matter；MWD，mean weight diameter；RAD，

Correlation analysis showed soil erodibility to be positively correlated with soil clay content，silt content and disintegration rate（P<0.01），but negatively correlated with soil sand content，saturated hydraulic conductivity，organic matter content and mean weight diameter of water-stable aggregate（P<0.01；Table 4）.In addition，no significant correlation was detected between soil erodibility and soil bulk density and between soil erodibility and soil total porosity.We found that the SOM content had the greatest correlation with soil erodibility.Regression analysis showed that soil erodibility linearly increased with increases in soil clay and silt contents（Figs.4a and b），but linearly decreased with increases in sand content（Fig.4c）.Moreover，soil erodibility increased with soil disintegration rate as a power function（Fig.4d），while it significantly decreased with soil saturated hydraulic conductivity（Fig.4e），SOM content（Fig.4f）and mean weight diameter of water-stable aggregate（Fig.4g）as a linear function.These results indicate that soil erodibility is significantly affected by soil properties，except for soil bulk density and soil total porosity.