Distribution and Physical Properties of Colluvium and Saprolite in Unchannelized Valleys in Tsukuba Experimental Basin, Japan

Ohnuki, Yasuhiro; Yoshinaga, Shuichiro; Noguchi, Shoji

doi:10.1007/bf02762250

Cited by 11 publications

(22 citation statements)

References 11 publications

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“…In this research, we found a significant difference in soil depth between the DDF (79 cm) and DEF (135 cm) using a dynamic cone penetrometer (S06-M). Ohnuki et al (1999Ohnuki et al ( , 2008 used the same apparatus and reported that maximum soil depth was 15 m in dry evergreen forest, 12 m in mixed forest, 3 m in dry deciduous forest in Cambodia, and 6 m in plantation forest in Japan. The soils studied in this research were very shallow compared with these soils.…”

Section: Discussionmentioning

confidence: 95%

“…2) around the soil sampling points (DEF4 was established without soil sampling in addition), and in each plot, soil depth and hardness were measured with a handy dynamic cone penetrometer (S06-M; Tsukuba Maruto, Tsukuba) at 25 points in 5 9 5 grid with a 10-m interval between each point (Ohnuki et al 1999(Ohnuki et al , 2008Onda 1992). The penetrometer has a U25 mm cone with a pointed tip (60°angle), U16 mm rods, and a 5 kg weight.…”

Section: Soil Profile Survey and Soil Penetration Testmentioning

confidence: 99%

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Comparison of soil depths between evergreen and deciduous forests as a determinant of their distribution, Northeast Thailand

Murata

Ohta

Ishida

et al. 2009

Journal of Forest Research

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Section: Discussionmentioning

confidence: 95%

Section: Soil Profile Survey and Soil Penetration Testmentioning

confidence: 99%

Comparison of soil depths between evergreen and deciduous forests as a determinant of their distribution, Northeast Thailand

Murata

Ohta

Ishida

et al. 2009

Journal of Forest Research

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“…In these locations, soil thickness and soil hardness did not change with the rainy and dry seasons because the surface soils would have as much pore space as temperate zone volcanic ash soils (Ohnuki et al, 1999). Soil thickness increased with elevation.…”

Section: Relationship Between Soil Thickness and Soil Typementioning

confidence: 98%

Distribution and characteristics of soil thickness and effects upon water storage in forested areas of Cambodia

Ohnuki

Kimhean

Shinomiya

et al. 2008

Hydrological Processes

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Abstract:Soil layers play an important role in hydrological processes, particularly in forested basins. For example, thick soil layers can store rainwater temporarily and drain it gradually. In the Mekong River Basin, especially in Cambodia, evergreen and deciduous forests are widely distributed. However, we have no data on soil conditions such as thickness and hardness that affect water storage capacity in forested areas. To clarify the water storage role of forest soils in the lower reaches of the Mekong River Basin, we investigated the distribution of soil thickness using a handy dynamic cone penetrometer in three Cambodian provinces: Kampong Thom, Kratie, and Mondul Kiri. Soil thickness was greater than 8 m in a deciduous forest in Kampong Thom. In some evergreen forests, apparent soil thickness varied from the rainy to dry seasons because of specific grain size distributions; for example, the soils were rock hard in the dry season and soft in the rainy season. In Kratie, deciduous forests prevailed and soil thickness was shallow at less than 3 m. In Mondul Kiri, forests were mainly formed on a basaltic plateau, and soil thickness was greater than 7 m. Soil thickness and hardness differed among the soil types in these three provinces, as did water storage capacity. The maximum water storage capacity was 1350 mm in an evergreen forest distributed on Acrisols in Kampong Thom. In contrast, the minimum water storage capacity was 225 mm in a deciduous forest distributed on Leptosols in Mondul Kiri. We constructed a soil thickness map for the study area in Kampong Thom that was mainly covered with evergreen forest; the distribution of soil thickness was related to elevation, with soil thickness increasing 0Ð13 m per 1 m increase in elevation, except in a deciduous mixed swamp forest area.

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“…3). The lithology is mostly biotite gneiss with granite dikes observed locally, covered by a thick kanto loam formation (Onuki et al [6]). Outflow was figure 1: locations of the observation sites area black dot, epicentre (142° 52′ east longitude, 38° 6′ north latitude).…”

Section: Tsukuba Sitementioning

confidence: 99%

Changes of outflow and shallow groundwater level in small mountainous basins immediately after the 2011 earthquake off the Pacific coast of tōhoku

Tamai¹

2018

Int. J. EI

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Distribution and Physical Properties of Colluvium and Saprolite in Unchannelized Valleys in Tsukuba Experimental Basin, Japan

Cited by 11 publications

References 11 publications

Comparison of soil depths between evergreen and deciduous forests as a determinant of their distribution, Northeast Thailand

Comparison of soil depths between evergreen and deciduous forests as a determinant of their distribution, Northeast Thailand

Distribution and characteristics of soil thickness and effects upon water storage in forested areas of Cambodia

Changes of outflow and shallow groundwater level in small mountainous basins immediately after the 2011 earthquake off the Pacific coast of tōhoku

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