Studies on Effective Desalinization Methods from Soils

土壤有效脱盐方法研究

基本信息

批准号：
15380165
负责人：
AKAE Takeo
金额：
$ 5.06万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15380165/
关键词：
desalinization soil amendment leaching slaking dissolution gypsum 乾燥干拓地粘土脱水ケーキ溶出表面荷電

项目摘要

In this study, we made two strategies for improving desalinization of saline soils. The one is applying soil drying before leaching and the another is mixing soil amendments for stabilizing percolating pores. The two strategies were examined on saline soils, the bottom mud of Kojima lake, Isahaya polder soil and soil of Hetao Irrigation District, Inner Mongolia.Mechanism of promotion of salt dissolution by soil drying was studied with special attention to air slaking of the soil matrix. Salt dissolution was promoted not only by salt accumulation to the surface of soil matrix but also by increasing salt diffusion coefficient through stabilized soil structure due to the soil drying. The experimental results showed the maximum salt dissolution at the water content of the maximum air slaking. Soil drying to the water content of the maximum air occurred slaking was found to be the most effective.It is known that the percolation pores are logged and leaching efficiency decreases in course of leaching. Soil amendments were added to improve hydraulic conductivity by stabilizing percolating pores. Among the soil amendments tested, the organic compost and the crashed charcoal were found most effective. The effectiveness was small on the Isahaya soil than the Hetao soil, because of swelling and dispersive properties of the Isahaya soil. Gypsum showed remarkable effect both on maintaining hydraulic conductivity and on extrusion of sodium.Soil drying practice, in particular, full upside down plowing was found to be very effective on desalinization and soil maturing of the Isahaya polder through successive yearly field research. Surface soil extrusion method, sand drain method and gypsum application method are tested and their effectiveness was evaluated by field test in Hetao Irrigation District.

在这项研究中，我们制定了两种改善盐水脱硫化的策略。一个是在浸出之前施加土壤干燥，另一个是在混合土壤修正案，以稳定渗透毛孔。研究了这两种策略在盐水，山野湖的底部泥浆，伊萨亚河的底部泥浆和赫托灌溉区的土壤，内蒙古。不仅通过盐积聚到土壤基质的表面，而且还通过由于土壤干燥引起的稳定土壤结构来促进盐溶解。实验结果表明，在最大空气扫描的水含量下，最大盐溶解。发现最大空气的水的土壤干燥被发现是最有效的。添加了土壤修正案，以通过稳定渗透孔来提高水力传导率。在测试的土壤修订中，发现有机堆肥和崩溃的木炭最有效。由于伊萨亚亚土壤的肿胀和分散性能，在伊萨亚山土壤上的有效性比hetao土壤小。石膏对维持液压电导率和钠的挤压表现出显着的影响。土壤干燥实践，特别是，通过连续的年度田间研究，发现全面的倒置耕作对脱氨基化和土壤成熟非常有效。测试了表面土壤挤出法，沙子排水法和石膏施用方法，并通过Hetao灌溉区的现场测试评估其有效性。