Table 6.2
Analytical results of tsunami deposits and underlying original soils of the tsunami-affected farmland in Miyagi Prefecture, Japan
Tsunami deposit
Original soil
Muddy (229)
a
Sandy (161)
1 (344)
2 (340)
Maximum Mean Minimum Maximum Mean Minimum Maximum Mean Minimum Maximum Mean Minimum
Total (g kg
À1
)
organic C
104
40.7
1.06
63.3
12.0
0.64
112
25.0
1.01
204
24.8
1.81
N
7.32
3.10
nd
4.79
0.77
nd
7.24
1.91
nd
11.7
1.78
nd
S
23.2
4.14
nd
3.60
0.59
nd
6.23
0.76
nd
2.87
0.66
nd
EC(1:5) (dS m
À1
)
56.1
15.1
0.19
19.1
2.31
0.08
11.9
2.36
0.06
4.80
1.31
0.06
Water-soluble (cmol
c kg
À1
)
Ca
2+
48.3
10.6
0.07
13.8
1.13
0.01
6.46
1.05
0.01
5.34
0.97
0.01
Mg
2+
59.8
13.7
0.02
18.2
1.34
0.01
11.7
1.08
0.01
2.90
0.57
0.01
K
+
3.90
1.41
0.03
1.57
0.24
0.02
1.20
0.22
0.02
0.65
0.10
0.01
Na
+
239
62.2
0.58
81.9
8.84
0.32
44.3
8.75
0.12
17.6
4.05
0.08
Sum
351
88.0
1.10
115
11.6
0.36
63.7
11.1
0.30
22.8
5.70
0.31
Exchangeable (cmol
c kg
À1
)
Ca
2+
40.0
10.19 1.05
22.9
7.15
0.50
25.0
5.90
0.25
25.5
7.71
0.21
Mg
2+
15.2
7.53
0.91
9.26
2.45
0.45
7.69
3.22
0.36
7.18
2.77
0.11
K
+
4.79
1.84
0.22
2.83
0.58
0.08
3.38
0.60
0.09
2.90
0.43
0.04
Na
+
16.9
5.74
0.26
7.69
1.55
0.06
6.29
2.12
0.05
4.40
1.32
0.03
Sum
64.3
25.3
2.79
34.1
11.7
1.73
28.6
11.8
1.15
28.5
12.2
0.51
pH(H
2 O)
8.9
6.2
3.5
9.2
6.8
4.6
8.6
5.2
4.2
8.0
5.3
3.4
pH(KCl)
7.9
5.8
3.2
8.2
6.3
4.1
7.5
4.5
3.6
7.2
4.7
3.0
pH(H
2 O)-pH(KCl) 1.4
0.34
0.05
1.9
0.53
0.05
2.0
0.64
0.16
1.8
0.67
0.19
Truog P (g P
2 O
5
kg
À1
)
1.72
0.349 0.024
0.624
0.156 0.039
2.65
0.248 0.027
1.72
0.150 0.003
nd
not detected due to the value being lower than the detection limit
a
Parentheses show the number of each sample type
6.2 Effects of Tsunami on Soils
139