Kyushu University Academic Staff Educational and Research Activities Database
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Syuntaro Hiradate Last modified date:2020.07.28

Professor / Division of Bioproduction Environmental Sciences
Department of Agro-environmental Sciences
Faculty of Agriculture

Graduate School
Undergraduate School

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Academic Degree
Ph.D. (Agriculture)
Country of degree conferring institution (Overseas)
Field of Specialization
Soil Science
Total Priod of education and research career in the foreign country
Outline Activities
Based on soil science, I perform education and research activities to establish suitable and sustainable management system of agricultural soils, develop soil evaluation methods, clarify soil chemical reactions, conserve biodiversity, clarify material cycling in ecosystems, etc. In laboratory experiment, I try to analyze soils using cutting-edge analytical techniques, such as nuclear magnetic resonance spectroscopy and mass spectroscopy in addition to general chemical analyses. Also, I conduct field survey on Ogasawara Islands and Aso-Kuju National Parks, etc., for their conservation research.
Research Interests
  • Regulation of soil environment for the conservation of biodiversity and ecosystems
    keyword : avalable phosphate in soils, exchangeable acidity, alien plants, endemic plants
  • Interactions between soil components and plant essential elements
    keyword : Phosphorous,Nuclear Magnetic Resonance
Academic Activities
1. Syuntaro HIRADATE, Properties of Soils of the Ogasawara Islands: Keys to Understand Past Nature and Find Adequate Management for Future, Global Environmental Research, 23, 1&2, 29-36, 2019.12, [URL], Soil profiles under natural forest vegetation on four islands of the Ogasawara Islands, Japan, were compiled and evaluated based on chemical analysis to learn about the natural habitats of the past and determine adequate management measures for conserving the respective ecosystems. The majority of the soils could be characterized as high acidity (high exchangeable acidity, low pH(H2O) with low pH(KCl)), high cation exchange capacity (CEC) and high proportions of exchangeable Mg over exchangeable Ca and K, and those soils are in fairly early stages of weathering, differing from “laterite” and/or “laterite-like soils.” Available P for plants in the soils is bimodal: very low or very high. The very high level of soil-available P was caused by seabird activities in the past. The high proportion of exchangeable Mg would induce Ca and K deficiency in plants, and this situation would have prevailed in the Ogasawara Islands. Available N for plants in the surface horizons of the soils is generally high and does not limit the ecosystem productivity in many cases of natural forest. Soil erosion would cause fatal effects on the ecosystem by removing the surface horizons and exposing subsoil horizons with extremely high levels of soil acidity, high proportions of exchangeable Mg and low levels of available P and N, with inappropriate permeability and aeration ability for plant growth. Such subsoil horizons would provide very poor conditions for growing plants. Conserving soils is essential and important to the recovery and restoration of the natural vegetation and ecosystems..
2. Katsutoshi Nishino, Misao Shiro, Ryuki Okura, Kazuya Oizumi, Toru Fujita, Takahiro Sasamori, Norihiro Tokitoh, Akiyoshi Yamada, Chihiro Tanaka, Muneyoshi Yamaguchi, Syuntaro Hiradate, Nobuhiro Hirai, The (oxalato)aluminate complex as an antimicrobial substance protecting the "shiro" of Tricholoma matsutake from soil micro-organisms, Bioscience, Biotechnology and Biochemistry, 10.1080/09168451.2016.1238298, 81, 1, 102-111, 2017.01, Tricholoma matsutake, a basidiomycete, forms ectomycorrhizas with Pinus densiflora as the host tree. Its fruiting body, "matsutake" in Japanese, is an edible and highly prized mushroom, and it grows in a circle called a fairy ring. Beneath the fairy ring of T. matsutake, a whitish mycelium-soil aggregated zone, called "shiro" in Japanese, develops. The front of the shiro, an active mycorrhizal zone, functions to gather nutrients from the soil and roots to nourish the fairy ring. Bacteria and sporulating fungi decrease from the shiro front, whereas they increase inside and outside the shiro front. Ohara demonstrated that the shiro front exhibited antimicrobial activity, but the antimicrobial substance has remained unidentified for 50 years. We have identified the antimicrobial substance as the (oxalato)aluminate complex, known as a reaction product of oxalic acid and aluminum phosphate to release soluble phosphorus. The complex protects the shiro from micro-organisms, and contributes to its development..
Membership in Academic Society
  • Soil Science Society of America
Educational Activities
I teach students soil functions and roles, fundamental soil constituents, soil organisms, soil formation and taxonomy, soil analytical methods, etc. Based on the fundamental knowledge of soil science, I performed education activity on environmental science, agricultural production science, ecology, conservation, etc.