Table 7.2
14
C ages of sclerotia, humic acid, and humin in the ONT profile
Sample
Horizon
Depth
(cm)
Grain size/or
fraction
Diameter
(mm)
Sample amount
(mg)
Number of
grains
14
C age
(year BP)
Labo code
Average
14
C age
(year BP)
Sclerotia Ah1
0–15
S
0.6
3.3
25
499
Æ 37
MTC-08472 672
M
1.9
4.0
3
687
Æ 30
MTC-08043
L
2.4
1.8
1
831
Æ 44
MTC-07789
Ah2
15–24
S
0.6
3.9
34
1134
Æ 40
MTC-09442 1424
M
1.6
3.1
4
1450
Æ 34
MTC-08044
L
2.9
4.4
1
1688
Æ 42
MTC-07792
E/A
24–34
S
0.6
3.5
25
1590
Æ 44
MTC-08478 1702
M
1.9
4.0
3
1620
Æ 33
MTC-08045
L
2.5
2.0
1
1897
Æ 46
MTC-07790
Bs
34–44
S
0.6
2.8
30
2411
Æ 35
MTC-08481 2417
M
1.6
3.5
5
2121
Æ 35
MTC-08046
L
2.1
1.8
1
2720
Æ 41
MTC-08485
Others
Ah1
Humic acid
3.8
444
Æ 32
MTC-09431
Humin
18.0
980
Æ 33
MTC-09435
Ah2
Humic acid
3.9
962
Æ 53
MTC-09432
Humin
47.0
1589
Æ 33
MTC-09436
E/A
Humic acid
3.6
1851
Æ 44
MTC-09433
Humin
31.7
2977
Æ 37
MTC-09437
Bs
Humic acid
4.0
2505
Æ 44
MTC-09434
Humin
119.7
3754
Æ 42
MTC-09438
126
M. Watanabe et al.