Table 5 Principal component analysis (PCA) results for the soil nutrient indices.

From: The advantage of afforestation using native tree species to enhance soil quality in degraded forest ecosystems

Items

Principal component 1

Principal component 2

Composite Score Loading

Weight (%)

Factor Loading

Linear Combination Weight

Factor Loading

Linear Combination Weight

TN

0.987

0.471

− 0.026

− 0.023

0.368

16.23

TP

0.872

0.417

0.202

0.177

0.361

15.94

TK

− 0.429

− 0.205

0.716

0.624

0.302

13.31

AP

− 0.005

− 0.003

0.815

0.711

0.166

7.33

AK

0.764

0.365

0.306

0.267

0.342

15.11

AN

0.963

0.460

− 0.052

− 0.045

0.364

16.07

SOC

0.976

0.466

− 0.024

− 0.021

0.363

16.02

Eigenvalue

4.380

1.315

  

Explained Variance

62.6%

18.8%

  
  1. When calculating the comprehensive score coefficient and weight, to avoid negative numbers, the linear combination coefficient is calculated after taking the absolute value.
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