Plotb

Total organic matter

humic acid

C species of humic acid

Alkyl-C

O-alkyl-C

Aromatic-C

Carbonyl-C

? g C kg−1 dried soil ?

g C kg−1 dried soil (% of humic acid)

F

10.4

4.41

0.96

(21.7)

0.76

(17.3)

1.65

(37.4)

1.04

(23.6)

F + HC

25.6

12.5

2.33

(18.6)

2.34

(18.7)

4.84

(38.7)

3.00

(24.0)

Plotb

fulvic acid

C species of fulvic acid

Alkyl-C

O-alkyl-C

Aromatic-C

Carbonyl-C

? g C kg−1 dried soil ?

g C kg−1 dried soil (% of fulvic acid)

F

4.22

0.51

(12.0)

2.01

(47.7)

0.56

(13.2)

1.14

(27.1)

F + HC

7.06

1.19

(16.9)

3.17

(44.9)

0.98

(13.9)

1.71

(24.2)