《Table 4–Significance of regression coefficient of the model.》

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《"Development of a model to simulate soil heavy metals lateral migration quantity based on SWAT in Huanjiang watershed,China"》

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In Eq.（3），ln（lnp H），ln（a1×0.01+a2×0.026+a3×1.025），and ln（CHins×Ased+CHw-s×Vflow）could be summarized as p H value，soil particle size，soil erosion and runoff，respectively.We investigated whether these three parts significantly influenced the simulation results and there were latent inter-relationships between these parameters.Additionally，we determined whether it was necessary to reduce the dimensions of these parameters（Li，2015）.The results of regression coefficient analysis were summarized in Table 4.The significance of these variables for As，Pb and Cd were all less than 0.05，indicating the importance of these variables.Therefore，soil p H value，particle size，and erosion and runoff were considered as three most important and independent factors influencing heavy metal migration.