Study on salt accumulation process in response to carbon cycle in soils

2016 Fiscal Year Final Research Report

• Project/Area Number: 26660189
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Rural environmental engineering/Planning
• Research Institution: The University of Tokyo
• Principal Investigator: Nishimura Taku 東京大学, 大学院農学生命科学研究科(農学部), 教授 (40237730)
• Co-Investigator(Renkei-kenkyūsha): HAMAMOTO Shoichiro 東京大学, 大学院農学生命科学研究科, 准教授 (30581946) ; IMOTO Hiromi 東京大学, 農学部, 技術職員 (40419255)
• Research Collaborator: ISHIBASHI Sakuya 東京大学, 大学院農学生命科学研究科
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 塩類集積 / 二酸化炭素 / 炭酸カルシウム / 有機物

Outline of Final Research Achievements

Salt accumulation is a world-wide issue at arid and semi-arid regions. Problems of sodic soils and reclamation of the soil by using Ca amendments have been studying for several decades. Besides, vast salt accumulated areas are covered by carbonates such as calcium carbonate, too. Carbonates are often less soluble with water and this made carbonates accumulations difficult to be remediated. However, carbonates attain equilibrium with water and CO2 in soil air phase. CO2 concentration of soil air phase may be far greater than that in atmosphere due to soil respiration, and this may enhance solubility of carbonates. To discuss role of variable soil CO2 concentrations on carbonates fate and sodic soil reclamation, we constructed laboratory soil column experimental scheme. In the column, soil CO2 concentration can be controlled as well as soil moisture and CO2 concentration can be monitored continuously.

Free Research Field

土壌物理学