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  Dept. or Engiron. Engineering Fac. of Agric. Utsunomiya Univ.

　 Lab. of Soil and Bio-Environmental Physics

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■Research
This laboratory concerns with transport and retention of materials in soils.



■Graduation Theses

Graduated in	Name	Title
2011.3	Tatsuya NAGAI	Unsaturated hydraulic conductivity in pristine and drained peat layers
2011.3	Ryutaro SOMA	Gas diffusion coefficient of pristine- and drained-areas in peatlands
2011.3	Chigusa TSUJI	Soil gas diffusivity measurement with CO2-air- and N2-air-binary diffusion
2012.3	Kazuma MASAKI	Soil gas diffusivity measurement for water soluble gases
2013.3	Ryosuke IKEDA	Transition of Soil CO2 profiles affected by the distance from a tree
2013.3	Yuma WADA	Development of a CO2 measurement system with a portable infrared CO2 probe
2013.3	Hitomi AKUTSU	Comparison of soil water movement in top soils of grassland at various distances from a tree
2013.3	Takumi HIRAI	Evaluation of trunk-radial profile of sap flow and transpiration with thermal dissipation method
2013.3	Naoki KOIKE	Direct measurements of soil water distribution around a tree in a grassland
2013.3	Chihiro TSUNEKAWA	Observation of groundwater recharge in the presence of tree water uptake
2014.3	Hiroki AJITO	Depth profiles of soil moisture condition in rooting depth around a tree row
2015.3	Takayuki HOSHINO	Seasonal behaviors of in-situ matric potential and water storage in a grassland soil
2015.3	Daiki IIMURA	Development of a CO2 gas analyzing system and its application to soil gas monitoring in a field
2015.3	Natsumi GOKA	Comparison of soil moisture hysteresis between a volcanic ash soil and a loamy soil
2015.3	Koki TEZUKA	Predicting the hydraulic conductivity of unsaturated soils from soil moisture characteristic curves
2015.3	Yukio USUI	Probing moisture hysteretic behaviors in soil gas diffusivity
2016.3	Maiko CHO	Effects of soil moisture hysteresis on soil gas diffusivity
2016.3	Temma KURATA	Effects of soil pore structure on unsaturated hydraulic conductivity
2016.3	Kota TSUKAGOSHI	Changes in soil CO2 production through grassland renovation
2017.3	Hikaru SHOJI	Seasonal behaviors of the depth profile of in-situ soil CO2 production rates
2018.3	Karen ARAKAWA	Transition of in-situ soil moisture characteristics
2018.3	Hayato SUTO	Seasonal changes in dissolved CO2 flux in in-situ soil layers
2019.3	Miharu ANZAI	Measurement of soil pH under CO2 equilibrium between gas and liquid phases
2019.3	Kosuke OGASAWARA	Seasonal transition in soil water retentivity in a field
2019.3	Yusuke SAKANISHI	Changes in vertical profile of water potential near the land surface
2020.3	Jota KANEKO	Seasonal change in water conductance across a soil-atmosphere boundary
2020.3	Seiya TAKAKI	Estimation of infiltration rate of a field soil based on moisture condition and hydraulic conductivity of the soil
2020.3	Nao TOTSUKA	Effects of in-situ soil moisture hysteresis on plant available water
2021.3	Keisuke KANISAWA	Estimation of thermal damping depth by monitoring diurnal fluctuation of soil temperature
2021.3	Chisato KAMOI	Estimation of soil thermal diffusivity through observation of soil temperature
2021.3	Chihiro KUROKAWA	Soil respiration rate analysis based on the depth profile of gaseous CO2 concentration

* currently defending.



■Master Theses

Graduated in	Name	Title
2013.3	Chigusa TSUJI	Soil gaseous behaviors affected by soil hardening in a top soil layer
2013.3	Tatsuya NAGAI	Soil moisture profiles with various groundwater table levels in peatlands
2015.3	Takumi HIRAI	Evaluation of plant availability of water and nutrition in soil
2017.3	Takayuki HOSHINO	Field monitoring of hysteretic behaviors in soil moisture characteristics
2018.3	Temma KURATA	Evaluation for the hydraulic conductivity based on field-monitored Soil moisture condition
2020.3	Hayato SUTO	Influence of soil gaseous CO2 profile on soil pH conditions in a field soil layer
2021.3	Miharu ANZAI	Soil pH affected by liquid-gaseous equilibrating process of CO2 in soil

* currently defending



■Publication

Iiyama I, Osawa K, Surface O2 influx related to soil O2 profiles in a drained tropical peatland. Soil Science and Plant Nutrition, 56, 517-520 (2010) (doi: 10.1111/j.1747-0765.2010.00488.x).

Iiyama I, Osawa K, Nagata O, Soil O2 profile affected by gas diffusivity and water retention in a drained peat layer. Soils and Foundations, 52, 49-58 (2012) (doi:10.1016/j.sandf.2012.01.005).

Suzuki K, Iiyama I, Detection of transitinoin wetland environment using GeoEye-1 satellite imagery. J JSPRS, 51(3), 146-150 (2012). (in Japanese with English summary)

Iiyama I, Osawa K, Nagai T, A seasonal behavior of surface soil moisture condition in a reclaimed tropical peatland. Soil Science and Plant Nutrition, 58, 543-552 (2012) (doi: 10.1080/00380768.2012.723222).

Eguchi S, Sawamoto M, Shiba M, Iiyama I, Hasegawa S, Wellbore-wall compression effects on monitored ground water levels and qualities. Ground Water, 51(3), 452-460. (2013) (doi:10.1111/j.1745-6584.2012.00979.x.).

Iiyama I, Hirai T, Subsoil water available in suction and poor in amount under continuous grassland use. Soil Science and Plant Nutrition, 60(4), 439-447 (2014) (doi: 10.1080/00380768.2014.915199.).

Iiyama I, Iimura D, A simple CO2 gas analyzing system for soil gas samples, J Jpn Soc Soil Phys, 128, 33-38 (2014). (in Japanese with English summary)

Iiyama I, Differences between field-monitored and laboratory-measured soil moisture characteristics. Soil Science and Plant Nutrition, 62(5-6), 416-422 (2016) (doi:10.1080/00380768.2016.1242367.).

Iiyama I, Characteristics of an in-situ unsaturated hydraulic conductivity of soil. Soil Science and Plant Nutrition, 65(3), 215-222 (2019) (doi:10.1080/00380768.2019.1593793.).