Journal of the Japanese Society of Soil Physics

[title in Japanese]

[in Japanese]

2012 Volume 120 Pages 1-2
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_1

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History of Soil Physical Studies in Japan

Shuichi HASEGAWA

2012 Volume 120 Pages 5-14
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_5

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Technological trend of Drainage improvement for upland soil

Iwao KITAGAWA

2012 Volume 120 Pages 15-20
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_15

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Landuse of peatland and its conservation

Takashi INOUE

2012 Volume 120 Pages 23-28
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_23

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Denitrification in paddy fields and shallow aquifers for environmental water purification

Sadao EGUCHI

2012 Volume 120 Pages 29-38
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_29

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Denitrification in soil and groundwater sys-tems forms the largest black box in the global nitrogen cycle, functioning as the largest sink of nitrogen with highest uncertainty. Quantification and modeling of in situ denitrification in soil and groundwater systems under various environmental conditions are needed for obtaining more reliable estimates of denitrification. This paper reviews the characteristics and controlling factors of denitrification in paddy fields and shallow aquifers, and the needs of soil physics‒based approach for quantifying and modeling in situ denitrification. Di-rect measurement of in situ denitrification under field conditions is very difficult; alternatively, nitrate remov-al rate is often measured. In paddy fields, nitrate re-moval data have been accumulated under various en-vironmental conditions, and practical modeling of nitrate removal has been going on. On the contrary, in shallow aquifers, nitrate removal is merely measured based on the determination of three-dimensional groundwater flow and nitrate transport. Soil physics should play much more significant role in determining and modeling in situ denitrification rate in soil and groundwater systems, and in elucidating the global ni-trogen cycle.

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Discussion at the 53rd symposium on soil physics as a field science and its role to our society

[in Japanese], [in Japanese], [in Japanese]

2012 Volume 120 Pages 39-43
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_39

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Adsorption of Sodium Dodecylbenzene Sulfonate on Highly Humic Non‒allophanic Andisol at High‒Electrolyte Concentration

Farook AHMED, Munehide ISHIGURO, Kazuki MORIGUCHI, Takeo AKAE

2012 Volume 120 Pages 45-54
Published: 2012
Released on J-STAGE: August 26, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_45

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To clarify the adsorption characteristics of surfactants, it is important to understand the surfac-tant behavior in the soil and water environments. However, there are few adsorption studies for highly humic soil. In this study, the adsorption characteristics of dodecylbenzene sulfonates in a highly humic soil were investigated. A non‒allophanic Andisol was used since this soil contains a large amount of humic sub-stances and is only negatively charged. Thus, electri-cally, only repulsive force is generated between the soil and the surfactant. The adsorption amount was measured using the batch method at an electrolyte concentration of 100 mmol L－1 NaCl in order to shield the electric field near the soil particle surface and em-phasize hydrophobic reactions. The adsorption iso-therm was examined using the Langmuir‒Freundlich‒Hill equation. The adsorbed amount increased sharply with increasing concentrations in the low‒concentra-tion range. The sharp increase indicated cooperative adsorption caused by hydrophobic interaction among the carbon chains of adsorbing surfactants. The ad-sorption amount became higher at a lower pH because electrostatic repulsion between the soil and the surfac-tant decreased. The adsorption of dodecylbenzene sul-fonate with a linear carbon chain was larger than that with a branched chain due to the difference of the car-bon chain structure.

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A simple and low cost method for measuring gas diffusivity and air permeability over a single soil cylinder

Purwoko Hari KUNCORO, [in Japanese]

2012 Volume 120 Pages 55-60
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_55

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A low cost unified system for relative gas diffusivity（Dp/D0）and air permeability（ka） measure-ments has been developed. Instead of the conventional sliding‒mechanism, plastic films’ shutter has been pro-posed for the Dp /D0 measurement. While for the ka measurement, a method has been introduced by utiliz-ing the principle of Mariotte’s bottle and manometers instead of much costing air pump, mass flow meter, and pressure sensor/gauge. The measured Dp/D0 and ka of Toyoura sand were in a good agreement with those obtained in the literature, and the proposed method enabled to lower the apparatus cost up to 40 % of the common method cost.

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Reviewing classical studies in soil physics “The capillary potential function and its relation to irrigation practice” By W. Gardner, O. W. Israelsen, N. E. Edlefsen, and H. Clyde, Phys. Rev. 20, 196（1922）

Teruhito MIYAMOTO

2012 Volume 120 Pages 61-65
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_61

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[title in Japanese]

[in Japanese]

2012 Volume 120 Pages 67
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_67

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[title in Japanese]

[in Japanese]

2012 Volume 120 Pages 69
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_69

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[title in Japanese]

[in Japanese]

2012 Volume 120 Pages 72
Published: 2012
Released on J-STAGE: August 27, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.120.0_72

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