Parameters included in the model

Eigen value^b

Variation explains solely

Fvalue^c

Pvalue^c,d

AOA

TN

0.40

40

4.04

0.002

SOM

0.14

14

1.51

0.208

${\text{NH}}_4^{+}$ -N

0.10

10

1.13

0.416

${\text{NO}}_3^{-}$ -N

0.09

9

1.00

0.480

PH

0.09

9

1.04

0.448

Latitude

0.09

9

1.15

0.488

AOB

${\text{NH}}_4^{+}$ -N

0.23

23

1.84

0.106

SWC

0.14

14

1.09

0.412

PNA

0.18

18

1.57

0.240

SOM

0.08

8

0.70

0.644

pH

0.16

16

1.57

0.250

Latitude

0.09

9

0.76

0.550