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Table 3 Correlation coefficients of major components in 31 kinds of carbon sources

From: Effect of nitrogen addition on the carbon metabolism of soil microorganisms in a Calamagrostis angustifolia wetland of the Sanjiang Plain, northeastern China

Category

Biolog EcoPlate well

Carbon source types

PC1

PC2

Carbohydrate

B2

D-xylose

0.383

−0.841

H1

α-D-lactose

0.969

−0.205

A2

β-methyl-D-glucoside

0.987

−0.117

G2

α-D-glucose-1-phosphate

0.979

−0.092

E1

α-cyclodextrin

0.434

0.719

F1

Glycogen

0.549

0.785

G1

D-cellobiose

0.989

−0.119

Amino acids

A4

L-arginine

0.463

0.607

B4

L-asparagine

0.809

0.018

C4

L-phenylalanine

0.469

0.805

D4

L-serine

0.96

0.09

E4

L-threonine

0.746

−0.119

F4

Glycyl-L-glutamic acid

0.917

0.343

Esters

B1

Pyruvic acid methyl ester

0.699

0.29

C1

Tween 40

−0.226

0.262

D1

Tween 80

0.723

−0.213

A3

D-galactonic acid-γ-lactone

−0.072

0.088

Alcohols

C2

i-erythritol

0.575

−0.178

D2

D-mannitol

0.968

−0.113

H2

D, L-α-glycerol phosphate

0.852

0.04

Amine

G4

Phenylethyl-amine

0.408

−0.825

H4

Putrescine

0.963

−0.103

E2

N-acetyl-D-glucosamine

0.976

0.036

Acids

B3

D-galacturonic acid

0.956

−0.063

F2

D-glucosaminic acid

0.926

−0.073

C3

2-hydroxy benzoic acid

0.381

0.697

D3

4-hydroxy benzoic acid

−0.396

0.089

E3

γ-hydroxybutyric acid

−0.169

−0.261

F3

Itaconic acid

0.392

−0.772

G3

α-ketobutyric acid

0.334

0.116

H3

D-malic acid

0.966

−0.181

  1. PC1 principal component 1, PC2 principal component 2