Table 2 Principal component analysis results and standard values of 16 soil properties and soil quality indicator weights in the minimum data set.

From: Assessment of soil quality in an arid and barren mountainous of Shandong province, China

Indicator

PC1

PC2

PC3

PC4

Communality

Grouping

Norm

TDS Weight

Soil moisture

0.813

0.077

0.332

0.372

0.916

1

2.001

0.063

Sand

− 0.358

− 0.058

− 0.874

− 0.301

0.986

3

1.856

0.068

Silt

0.377

0.052

0.859

0.313

0.980

3

1.857

0.067

Clay

0.053

0.119

0.903

0.098

0.841

3

1.673

0.058

pH

− 0.732

0.089

− 0.205

− 0.057

0.590

1

1.664

0.041

Available P

− 0.314

− 0.781

− 0.435

− 0.033

0.899

2

1.775

0.062

Organic C

0.867

0.3

0.186

− 0.018

0.877

1

2.014

0.060

C

0.921

0.23

0.022

− 0.017

0.903

1

2.070

0.062

N

0.958

0.005

0.224

0.101

0.978

1

2.154

0.067

P

0.286

− 0.542

0.117

− 0.668

0.834

5

1.667

0.057

BG

0.275

0.945

0.078

− 0.01

0.975

2

1.837

0.067

LAP

− 0.4

0.802

− 0.295

− 0.232

0.943

2

1.838

0.065

NAG

− 0.009

0.046

− 0.229

− 0.952

0.962

4

1.712

0.066

AP

0.317

0.778

0.261

0.411

0.943

2

1.803

0.065

Vector length

0.488

0.309

0.429

0.647

0.937

4

1.831

0.064

Vector angle

0.31

− 0.156

0.411

0.829

0.978

4

1.787

0.067

Eigenvalue

4.841

3.344

3.323

3.034

–

–

–

–

Variance (%)

30.255

20.901

20.767

18.959

–

–

–

–

Cumulative variance (%)

30.255

51.156

71.923

90.883

–

–

–

–

  1. Boldface loading values correspond to those selected from the Norm for correlation analysis and the soil indicators included in the minimum date set. Calculated weights for the indicators in the minimum date set. Clay: soil granularity < 0.002 mm; Silt: soil granularity 0.002–0.05 mm and Sand: soil granularity 0.05–2 mm.
  2. PC principal component; BG β-1,-4-glucosidase; LAP leucine aminopeptidase; NAG β-1,4-N-acetylglucosaminidase; AP alkaline phosphatase; TDS total date set.
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