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吉林省西部碳酸盐渍土基本性质试验研究

Keywords: 吉林西部,碳酸盐渍土,基本性质,毛细水上升试验

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Abstract:

通过对吉林省西部镇赉县盐渍土分布区进行现场勘查、采样和室内物理化学试验分析,研究了相同位置不同深度土样的基本性质.结果表明:地表以下1m以内土的易溶盐总量占单位土体质量百分比为0.1045%~0.4660%,该盐渍土类型为弱碳酸盐渍土.地表以下0~30cm深度范围内,土壤含盐量随深度的增加而增加;在30~100cm深度范围内土壤含盐量随深度的增加而减小.土体类别为低液限黏土,土的pH值为8.12~9.12,天然状态下呈碱性.在0~30cm深度范围内,pH值随深度的增加而增加,在30~100cm深度范围内随深度的增加而减小.土中含有一定量的有机质,并含有大量交换性钠,这对土的毛细性及冻结过程中的水分迁移产生较大影响.通过毛细水上升试验发现,距地表0~40cm深度范围内土体中含有大量的交换性钠,颗粒分散性极大,土颗粒间孔隙过小,毛细阻力大,毛细现象微弱.冻融法毛细水上升试验中,温度梯度作用引起的土中薄膜水的迁移造成了不同层高土含水率的微量变化.

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