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1、除按颗粒组成分类的9种土壤外,有些常遇到的含有矿物质和有机物质的土壤,它们的性质如何(1401) ? 几种常遇到的特殊土壤和它的性质大概如下: (1)黄土属于粉砂质粘上炉坶,部分属于粘土,具有大孔性结构,能构成很高的垂直边坡。在干燥地区受风蚀很厉害时,边坡路肩需加固。在有暴雨及中常潮湿地带,最好避党高填深挖。在黄土地带筑路,特别要注意排水问题,易被冲刷的地方应予防护。 (2)盐渍土凡地表1公民深的土层,平均含有0.3％以上的易溶盐类(按重量计)时,都称为盐渍土。盐渍土是在特殊条件下形成的。土壤盐渍化的类型及其特征和盐渍土的分类示于表
1. What is the nature of some commonly encountered soils containing minerals and organic matter, in addition to the nine soils classified according to their particle composition (1401)? Several special soils often encountered and their nature are as follows: (1) The loess belongs to the silty gluing furnace, part of which belongs to the clay and has a macroporous structure, which can form a high vertical slope. In the dry areas by the wind erosion is very powerful, the slope shoulder to be reinforced. In heavy rain and moderate humid areas, it is best to avoid digging the party to fill high. Road construction in the loess belt, with particular attention to drainage problems, easy to be washed away should be protected. (2) Salty soil Whereas the deep soil of the earth’s surface, containing on average 0.3% or more of soluble salts (by weight), are referred to as saline soil. Saline soil is formed under special conditions. The types of soil salinization and their characteristics and the classification of saline soil are shown in the table