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为了阐明黄土性固化土壤水分特征的植物有效性,探讨将EN-1固化剂应用于黄土边坡生态防护的可行性。采用室内模拟试验,以黄土地区典型土壤黄绵土为研究对象,对固化土壤的持水、供水、导水及蒸发性能进行研究。结果表明:不同处理土壤水吸力与对应土壤含水量的关系均符合方程θ=aS-b幂函数关系;固化剂降低了土壤的持水能力,但对土壤有效水含量影响不显著。固化剂有利于土壤导水能力提高,固化剂掺量在0.05%~0.10%范围内土壤具有最大入渗能力;无论土壤中是否加入固化剂,随土壤容重增加,土壤饱和导水率降低。固化黄绵土在蒸发初期土壤水分急剧减少,后期趋于缓慢;固化黄绵土累积蒸发量均低于对照,但不同固化剂掺量处理间差异不显著。
In order to elucidate the plant effectiveness of soil moisture characteristics of loessial solidified soils, the feasibility of applying EN-1 curing agent to ecological protection of loess slopes was discussed. Using indoor simulation test, the typical soil loessial soil in loess area was taken as the research object to study the water holding capacity, water supply, water conductivity and evaporation performance of solidified soil. The results showed that the relationship between soil water suction and soil moisture content under different treatments all accorded with the power function of equation θ = aS-b. The curing agent decreased soil water holding capacity but had no significant effect on soil available water content. The curing agent is conducive to the improvement of soil water conductivity. The content of curing agent in the range of 0.05% ~ 0.10% of the soil has the maximum infiltration capacity. Saturated hydraulic conductivity decreases with the increase of soil bulk density, regardless of whether the curing agent is added to the soil. The soil moisture of solidified loessial soil decreased sharply at the beginning of evaporation, and the latter tended to be slow. The cumulative evaporation of cured loessial soil was lower than that of the control, but the difference between different curing agent dosages was not significant.