9.3 Variation of Sclerotia Distribution in Mt. Chokai
In this part, sclerotia distributions in soil profiles were examined at mesoscale by
conducting soil surveys and analyses along a transitional soil sequence developed
under Quercus serrata and F. crenata trees in Mt. Chokai, northern Japan.
Soil profiles were examined at 7 points on the western slope of Mt. Chokai
(39
05
0 57
00 N, 140
13
0 10
00 E; 2236 m asl.), in Yamagata Prefecture (Fig. 9.6). The
annual mean temperature and total precipitation at the summit of Mt. Chokai are
0.5
C and 3285 mm, respectively. The parent materials of the soils were weathered
andesite associated with continental aeolian dust. Extremely high precipitation
(mainly snowfall) and the non-andic mineralogical properties regulate the development of the investigated soils.
The soil profile data, sclerotia contents and soil analyses data for each profile are
summarized in Table 9.2, and Fig. 9.7. Sclerotia were observed in all investigated
soil profiles, where the content by weight and count in A horizons were
0.23–2.53 mg/g and 2.5–7.3 grain/g, respectively. The Chokai 3 profile was characterized by a high abundance of sclerotia, especially in count density. A further
particularity of the Chokai 3 profile was recognized by its high Al p content. It can be
suggested that the formation process of Al-hums complex is specific in this site. As
shown in Fig. 9.7, the soil pH of Chokai 3 was relatively high (pH (H 2 O) > 4)
compared to other profiles. Furthermore, from results of the content of free Al in
profiles (Fig. 9.8a), the relatively high amount of Al colloids, mainly in amorphous
and complex Al states, also suggests the exceptional property of Chokai 3. The
reason for this exception may be explained by vegetation (lack of F. crenata), and/or
by parent materials such as the absence of 2:1 layered silicates. Figure 9.8b shows
Fig. 9.5 Relationship between soil pH (KCl), Al p /Al o , and sclerotia content by weight among
surface soils
9 Spatial Distribution of Sclerotia Grains in Forest Soils, Northern and Central. . .
161
In this part, sclerotia distributions in soil profiles were examined at mesoscale by
conducting soil surveys and analyses along a transitional soil sequence developed
under Quercus serrata and F. crenata trees in Mt. Chokai, northern Japan.
Soil profiles were examined at 7 points on the western slope of Mt. Chokai
(39
05
0 57
00 N, 140
13
0 10
00 E; 2236 m asl.), in Yamagata Prefecture (Fig. 9.6). The
annual mean temperature and total precipitation at the summit of Mt. Chokai are
0.5
C and 3285 mm, respectively. The parent materials of the soils were weathered
andesite associated with continental aeolian dust. Extremely high precipitation
(mainly snowfall) and the non-andic mineralogical properties regulate the development of the investigated soils.
The soil profile data, sclerotia contents and soil analyses data for each profile are
summarized in Table 9.2, and Fig. 9.7. Sclerotia were observed in all investigated
soil profiles, where the content by weight and count in A horizons were
0.23–2.53 mg/g and 2.5–7.3 grain/g, respectively. The Chokai 3 profile was characterized by a high abundance of sclerotia, especially in count density. A further
particularity of the Chokai 3 profile was recognized by its high Al p content. It can be
suggested that the formation process of Al-hums complex is specific in this site. As
shown in Fig. 9.7, the soil pH of Chokai 3 was relatively high (pH (H 2 O) > 4)
compared to other profiles. Furthermore, from results of the content of free Al in
profiles (Fig. 9.8a), the relatively high amount of Al colloids, mainly in amorphous
and complex Al states, also suggests the exceptional property of Chokai 3. The
reason for this exception may be explained by vegetation (lack of F. crenata), and/or
by parent materials such as the absence of 2:1 layered silicates. Figure 9.8b shows
Fig. 9.5 Relationship between soil pH (KCl), Al p /Al o , and sclerotia content by weight among
surface soils
9 Spatial Distribution of Sclerotia Grains in Forest Soils, Northern and Central. . .
161