Table 3 Relationship models of soil water and heat in the 10-cm frozen soil layer during the freezing period.

From: Effects of soil water and heat relationship under various snow cover during freezing-thawing periods in Songnen Plain, China

 

Treatment

Model of soil water and heat

Coefficient of determination, R2

P value

RE/%

NSE

Freezing phase

Bare land

θ V  = 12.31 + 17.64/(1 + exp(−(T s  + 3.81)/5.24))

0.813

0.0132

6.19

0.828

Natural snow

θ V  = 13.74 + 21.30/(1 + exp(−(T s  + 4.27)/1.27))

0.834

0.0239

5.67

0.867

Compacted snow

θ V  = 15.67 + 12.74/(1 + exp(−(T s  − 2.18)/1.52))

0.875

0.0415

3.21

0.894

Thick snow

θ V  = 18.54 + 41.75/(1 + exp(−(T s  − 0.78)/0.56))

0.917

0.0064

2.98

0.909

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