Table 3 Analysis of the correlation between soil HA-C structural parameters and organic carbon contents in the aggregates.

From: Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Factors

Aromatic C

Aliphatic C/Aromatic C

Alkyl C/O-alkyl C

Hydrophobic C/Hydrophilic C

>2 mm

2–0.25 mm

0.25–0.053 mm

<0.053 mm

Aliphatic C

−0.502

0.904

−0.063

0.157

0.676

0.281

0.527

0.768

Aromatic C

1

−0.823

−0.807

−0.691

−0.967*

−0.952*

−0.999*

−0.826

Aliphatic C/Aromatic C

 

1

0.350

0.423

−0.924

−0.66

0.838

0.924

Alkyl C/O-alkyl C

  

1

0.838

0.632

0.846

0.796

0.355

Hydrophobic C/Hydrophilic C

   

1

0.532

0.570

0.699

0.215

>2 mm

    

1

0.969*

−0.927

−0.959*

2–0.25 mm

     

1

−0.991*

−0.857

0.25–0.053 mm

      

1

0.781

  1. Aliphatic C/Aromatic C = (Alkyl C + O-alkyl C)/Aromatic C; Hydrophobic C/Hydrophilic C = (Alkyl C + Aromatic C)/(O-alkyl C + Carbonyl C). * indicates a significant correlation at a 5% level.
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