Model Depth Fitting curve R2 RMSE MAE P-value
T-M-C Model I-1 layer (5-20cm) (n=104) \[F=0.123\times e^{0.049T}\times M^{-0.587}\times\frac{C}{C-2.29}\]
0.187
0.867
0.674
<0.001**
Deep layer (80-200cm) (n=156) \[F=0.019\times e^{0.099T}\times M^{-0.651}\times\frac{C}{C+1.181}\]
0.484
0.092
0.069
<0.001**
T-M-C Model I-2 layer (5-20cm) (n=104) \[F=0.298\times e^{0.047T}\times M^{-0.548}\times C^{-0.164}\]
0.162
0.870
0.700
<0.001**
Deep layer (80-200cm) (n=156) \[F=0.009\times e^{0.099T}\times M^{-0.651}\times C^{0.298}\]
0.483
0.090
0.070
<0.001**
T-M-C Model II-1 layer (5-20cm) (n=104) \[F={1.620}^{\frac{T-10}{10}}\times(0.382-0.133M+\frac{0.037}{M})\times\frac{C}{C-2.354}\]
0.186
0.868
0.676
<0.001**
Deep layer (80-200cm) (n=156) \[F={2.682}^{\frac{T-10}{10}}\times(0.251-0.808M+\frac{0.007}{M})\times\frac{C}{C+1.179}\]
0.490
0.091
0.068
<0.001**
T-M-C Model II-2 layer (5-20cm) (n=104) \[F={1.590}^{\frac{T-10}{10}}\times(1.216-1.738M+\frac{0.067}{M})\times C^{-0.182}\]
0.159
0.880
0.701
<0.001**
Deep layer (80-200cm) (n=156) \[F={2.691}^{\frac{T-10}{10}}\times(0.125-0.401M+\frac{0.004}{M})\times C^{0.295}\]
0.488
0.091
0.067
<0.001**