《Table 3 Correlation coefficients between SWC and related factors in various soil depths》

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《Spatial variability of soil water content and related factors across the Hexi Corridor of China》

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Note:LA，latitude；LO，longitude；EL，elevation；SG，slope gradient；SA，slope aspect；VC，vegetation coverage；BD，soil bulk density；Ks，saturated hydraulic conductivity；FC，field capacity；CC，soil clay content；SC，soil silt content；SOC，soil organic carbon con

Pearson's correlation coefficients between SWC and environmental variables are given in Table 3.The SWC increased with increasing LO and decreased with increasing LA，and the correlation coefficients decreased with increasing soil depth，which agreed with the results in Figure 3.The SWC was positively correlated with EL only in the upper soil layers（0–20，20–40 and 40–60cm）.Though SWC has been found to be controlled by topography in small catchments（Qiu et al2001；Huang et al.，2012），in this study it had no relationship with SG and SA in the whole soil profile except in the 20–40 cm soil layer at a regional scale.The SWC was significantly and positively correlated with VC（P<0.01）and the correlation coefficients ranged from 0.489 to0.560.Soil properties were significantly related to SWC（P<0.01）.The SWC was negatively correlated with BD and Ks and positively correlated with FC，CC，SC and SOC.The MAP was significantly correlated with SWC（P<0.01），whereas PE had no correlation with SWC（P>0.05）.The mixed index AI showed a significant and negative correlation with SWC.The correlation coefficients between climatic variables（MAP and AI）and SWC decreased with increasing soil depth，indicating that the effect of climate on SWC decreases with increasing soil depth.Therefore，the spatial variation of SWC was more determined by local factors（such as soil properties）rather than climatic factors（such as PE）（Li and Shao，2015） .The mean value of SWC（0.083 g/g）was lower than the mean value of FC（0.130 g/g）across the Hexi Corridor.