概要

山下 Name: Yuji YAMASHITA
Affiliation: Faculty of Life and Environmental Sciences
Specialty: Division of Appropriate Technology and Sciences for Sustainable Development
Field of Research: Soil Physics
Position: Assistant Professor
Degree: Ph.D.(agriculture)
Degree earning University : Graduate School of Life and Environmental Sciences, University of Tsukuba (March 2008)
Starting Date: September 16,2013
Mentor: Professor Yasuhisa Adachi, Professor Atsushi Ishii , Professor Toshiharu Enomae
Laboratory: http://yujiyamashita.wix.com/laboratory

Analysis of soil properties in terms of transport phenomena and interfacial chemistry

What does soil consist of? A surface soil consists of solid, liquid and gas phases, which are influenced by biological activities, in contrast to rocks at a deep ground. The mixture ratio of the three phases determines the physical structure of the soil. Solid phases contain inorganic (mineral) components that include various sizes of particulate matters such as sands or clays, and organic ones that include living organisms and humic matter. Because of the presence of a microscopic roughness and/or soil colloids (e.g. clay particles), the specific surface area of soil phases is huge (1 g clay has the area of a few square meters!). Thus, the surface of soil phases can act as a host to a vast number of chemical reactions for soil water. The phenomena in soil are therefore controlled not only physical structure but also the interfacial chemical properties of solid phases. It is important to analyze these physicochemical characteristics that are expressed by the multiple properties of soil so that we can understand a biological productivity and a cycling of substances in an agricultural environment. In the present study, we focus on both transport phenomena and an interfacial chemistry of a solid-liquid interface in soil to contribute to the solving problems such as soil contamination by hazardous chemicals (metals, radionuclides…) and fertilizer application.