Development of the system of desalinization and protection of salt accumulation for sustainable utilization of farm lands in arid/semi-arid regions

2015 Fiscal Year Final Research Report

• Project/Area Number: 25450359
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Rural environmental engineering/Planning
• Research Institution: Tottori University
• Principal Investigator: INOSAKO KOJI 鳥取大学, 農学部, 教授 (60243383)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: リーチング / 塩類集積 / キャピラリーバリア / 溶質移動 / 毛管上昇 / 浸潤

Outline of Final Research Achievements

A farm land management method was developed to remove excess salts from a surface soil layer and protect salt accumulation in a root zone. In this method, a high permeable material zone or layer are placed in soil. The zone is called a drainage tunnel (DT) and the layer is called a capillary barrier (CB). They are used as single agent or in combination for the condition of soil permeability. The performances for desalinization and protection of salt accumulation were assessed by model and numerical experiments.
The results were summarized as follows: 1) CB used in high permeable soil did not inhibit leaching of salts. Moreover it enforced water retention ability of surface layers and intercepted capillary rise from lower layers. 2) The combination use of CB and DT rapidly drained leaching water from surface layers to lower layers in low permeable soil. 3) The combination use enabled to perfectly intercept capillary rise from shallow underground water and protect salt accumulation.

Free Research Field

水土環境保全学