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As the field observations of Ks and K are time-consuming, and Ks and K are sensitive to soil texture (Williams et al. 1983; Kaczmarek et al. 2016), the pedo-transfer function method (Sun et al. 2016) was applied to get the values of Ks and K. The soil property estimation module integrated in the SPAW hydrological model (Saxton & Rawls 2006) was applied to calculate Ks. K was calculated with the erosion productivity impact calculator (Williams et al. 1983). Since there are two layers for each soil type recorded in HWSD, the Ks and K values for each soil type are depth weighted. For the water bodies, the values of Ks and K were set as 1 to exclude them from soil. The statistics of the spatial distributions of Ks, K, and Ks·K in YLX, WJB, and HQ are shown in Table 1.

Table 1

Statistics of Ks and K in study watersheds (Ks: mm/h; K:t·h·MJ−1·mm−1)

WatershedKs
K
Ks·K
MaxMinMeanStd. dev.MaxMinMeanStd. dev.MaxMinMeanStd. dev.
YLX 77.69 2.32 43.71 26.53 0.33 0.14 0.24 0.04 15.16 0.69 9.95 5.50 
WJB 116.44 1.33 13.18 10.15 0.36 0.16 0.28 0.09 13.80 0.37 3.67 2.74 
HQ 14.41 0.58 5.46 3.14 0.33 0.23 0.27 0.04 3.67 0.15 1.58 1.08 
WatershedKs
K
Ks·K
MaxMinMeanStd. dev.MaxMinMeanStd. dev.MaxMinMeanStd. dev.
YLX 77.69 2.32 43.71 26.53 0.33 0.14 0.24 0.04 15.16 0.69 9.95 5.50 
WJB 116.44 1.33 13.18 10.15 0.36 0.16 0.28 0.09 13.80 0.37 3.67 2.74 
HQ 14.41 0.58 5.46 3.14 0.33 0.23 0.27 0.04 3.67 0.15 1.58 1.08 

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