《Table 4 Semivariogram parameters of soil electrical conductivity》

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《Mapping Soil Electrical Conductivity Using Ordinary Kriging Combined with Back-propagation Network》

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Notes:Log（soil electrical conductivity）is log-transformed values of the raw soil electrical conductivity.Log（ResidualsRK）is log-transformed value of prediction residuals by multiple linear regression.ResidualsOK＿BP is raw value of prediction residuals

The data presented in Table 1 showed that the averages of the soil electrical conductivity for training sites at0–30 cm and 30–50 cm were 1.03 dS/m and 0.55 dS/m，respectively.The soil electrical conductivity decreased with the increase of soil depth，which indicated thatsalts accumulated on the soil surface.According to the classification standard of variability by Nielsen and Bouma（1985），the soil salinity displays strong，medium and weak variability when the coefficient of variations is<10%，10%–100%and>100%，respectively.Accordingly，there were strong and medium spatial variability at the soil depths of 0–30 and 30–50cm，respectively.The soil electrical conductivity for the training sites was positively skewed，while the log-transformed soil electrical conductivity showed approximately normal distribution.Therefore，the mapping of soil electrical conductivity was conducted by log-transformed values，and ultimately，the prediction values of the soil electrical conductivity were back-transformed into the original values using the antilogarithmic function.