Journal of the Japanese Society of Soil Physics

[title in Japanese]

[in Japanese]

2018 Volume 138 Pages 1-2
Published: 2018
Released on J-STAGE: May 16, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_1

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[title in Japanese]

[in Japanese]

2018 Volume 138 Pages 3-4
Published: 2018
Released on J-STAGE: May 16, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_3

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Phosphate sorption and precipitation in soils

Masami NANZYO

2018 Volume 138 Pages 5-12
Published: 2018
Released on J-STAGE: May 16, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_5

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Major chemical forms of inorganic phosphate in Japanese farmland soils are phosphates sorbed by ac-tive Al and Fe under oxidizing conditions. Young volcanic ash soils and granitic soils contain apatite. The apatite re-acts with active Al in young volcanic ash soils after grad-ual formation of active Al. Dividing the Japanese farm-land soils into Andosols and lowland soils, phosphate is mainly sorbed by active Al in Andosols whereas by ac-tive Fe in lowland soils. A crystalline precipitate of phos-phate, vivianite, is formed under reducing conditions in the submerged lowland paddy field soils although Vivian-ite dissolves and the phosphate is sorbed by active Fe af-ter drainage. Other crystalline phosphates may be formed only under somewhat special conditions.

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Prediction of adsorption behavior of trace elements on soil minerals

Keisuke FUKUSHI

2018 Volume 138 Pages 13-20
Published: 2018
Released on J-STAGE: May 25, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_13

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The term “adsorption” represents the accumu-lation of dissolved species on mineral surfaces or the re-moval of dissolved species on existing minerals. When the minerals are added to the solutions with trace elements,certain amounts of trace elements are removed by the min-erals while rests of trace elements are remained in the so-lutions. Researchers, who are interested in the adsorption of trace metals on minerals, desire to understand and pre-dict the adsorption behavior, quantitatively. In this paper, I review the methodologies to model the adsorption behav-iors.

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Geochemical modeling of pH buffering by soil components

Tsutomu SATO, Shoko NOZAWA, Takato NISHITA

2018 Volume 138 Pages 21-26
Published: 2018
Released on J-STAGE: May 25, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_21

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In this paper, pH buffering reaction by soil com-ponents is explained to renew soil scientist’s and engineer’s awareness of importance for chemical reaction in soil and role of minerals to the reaction. This paper also contains an overview of engineering importance for understanding of pH buffering reaction in soils to realize availability of geo-chemical modeling. One of case studies in applied geo-chemical modeling by the authors is also introduced to show how to determine a pH buffering reaction capacity of soil.

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Subsurface microbial activity: Beyond the thermodynamic ladder

Craig M. BETHKE, Robert A. SANFORD

2018 Volume 138 Pages 27-35
Published: 2018
Released on J-STAGE: June 23, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_27

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An integration of the study of groundwater chemistry, numerical modeling, long-term bioreactor experiments, and in-situ sampling of activity growing microbes yields a portrait of subsurface anaerobe activity that differs sharply from conventional thinking. The chemical record of microbial activity on a groundwater’s redox chemistry in a well-studied aquifer is surprisingly incomplete, casting doubt on current methods of classifying subsurface microbial activity in aquifers. We find no evidence to support a concept by which subsurface microbial activity is arranged according to a thermodynamic ladder, nor do we find backing for the theory of competitive exclusion. Instead, we find strong evidence that iron reducing and sulfate reducing bacteria, previously considered locked in competition, are in fact forming mutualistic relationships in which they tightly cooperate. Where a group of microbes such as the methanogens is excluded from an ecosystem, the explanation is more likely ecologic than thermodynamic.

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Discussion at the 59th symposium : Modeling of adsorption processes and microflora in soil and water logging zone

Junichi KASHIWAGI, Yasutaka TSUKAMOTO

2018 Volume 138 Pages 37-41
Published: 2018
Released on J-STAGE: June 23, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_37

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[title in Japanese]

2018 Volume 138 Pages 43-51
Published: 2018
Released on J-STAGE: June 23, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_43

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[title in Japanese]

[in Japanese]

2018 Volume 138 Pages 53-54
Published: 2018
Released on J-STAGE: June 23, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_53

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[title in Japanese]

[in Japanese]

2018 Volume 138 Pages 57
Published: 2018
Released on J-STAGE: June 23, 2021

DOIhttps://doi.org/10.34467/jssoilphysics.138.0_57

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