Agriculture Reference
In-Depth Information
Soil No. 8
(high labile C, low Fe)
Soil No. 14
(low labile C, high Fe)
50
5
16
16
CO
2
14
14
40
4
CO
2
12
12
10
10
30
3
8
CH
4
8
H
2
20
2
6
6
4
4
CH
4
10
1
2
2
H
2
0
0
0
0
500
7.5
600
7.5
1200
800
Acetate
Acetate
pH
500
1000
400
7.0
pH
600
7.0
400
800
300
6.5
300
600
200
400
6.5
200
6.0
100
400
E
H
100
200
6.0
E
H
5.5
200
0
0
0
−
100
5.0
0
−
100
5.5
200
1.4
5
275
2.0
5
250
SO
4
2
−
SO
4
2
−
175
1.2
225
4
4
150
Fe(II)
1.5
Fe(II)
200
1.0
175
125
3
3
0.8
150
100
1.0
125
0.6
100
2
2
75
NO
3
−
75
0.4
50
0.5
50
1
1
NO
3
−
25
0.2
25
0
0
0.0
0
0.0
0
0
20
40
60
80
100
120
0
20
40
60
80
100
120
Time after submergence (days)
Time after submergence (days)
Figure 5.2
Sequential reduction of electron acceptors and accumulation of CO
2
and CH
4
in two rice soils. The soils were submerged and
incubated at 30
◦
C in sealed bottles (Yao
et al
., 1999). Reproduced with kind permission of Kluwer Academic Publishers
