Table 3 Correlation between the C functional group contents and aggregate mass ratios in macroaggregates, microaggregates and the silt + clay fraction.
From: Accumulation of organic C components in soil and aggregates
C function group | Macroaggregates (>250 μm) | Microaggregates (53-250 μm) | Silt + clay fraction (<53 μm) | |||
|---|---|---|---|---|---|---|
Equation | R 2 | Equation | R 2 | Equation | R 2 | |
SOC | – | 0.301 | y = −3.283x+85.620 | 0.943** | y = 25.638e−0.049x | 0.714 |
Alkyl C | – | 0.330 | y = −18.451x+81.857 | 0.767 | y = 26.579e−0.320x | 0.807* |
O-alkyl C | – | 0.247 | y = −7.153x+85.505 | 0.946** | y = 25.626e−0.108x | 0.684 |
Methoxyl/N-alkyl C | – | 0.318 | y = −30.787x+83.477 | 0.984** | y = 25.298e−0.467x | 0.732 |
O-alkyl C | – | 0.177 | y = −12.487x+86.348 | 0.906* | y=26.079e−0.193x | 0.672 |
di-O-alkyl C | – | 0.187 | y = −35.879x+85.712 | 0.939** | y = 24.825e−0.521x | 0.628 |
Aryl C | – | 0.251 | y = −13.371x+86.746 | 0.917* | y = 25.133e−0.215x | 0.695 |
Aromatic C | – | 0.157 | y = −17.570x+86.002 | 0.873* | y = 25.700e−0.306x | 0.710 |
Phenolic C | – | 0.611 | y = −39.857x+83.157 | 0.983** | y = 23.820e−0.717x | 0.658 |
Carboxyl C | – | 0.307 | y = −16.925x+79.837 | 0.842* | y = 24.560e−0.271x | 0.667 |
