<正>针对我国东南沿海分布的高含盐、弱碱性软土的地基加固问题，研究了黏土含盐量与酸碱性对水泥土强度的影响。结果表明：碱性环境有利于水泥土强度提高；而酸性条件下不利于黏土凝硬反应，使得水泥土的强度降低。由于盐分浓度较高时，土粒双电层变薄，产生离子交换，易于团聚化作用，抵消了一部分酸性对强度的降低作用，因此在酸性土中含盐量对水泥土的强度有影响，而碱性土中含盐量对水泥土强度无明显影响。

Staphylea bumalda is a rare woody oil tree species, which is also used as an edible and landscape tree in China. The soft branches were used to study rooting ability of greenwood cuttings. The effects of cutting types, kinds and treatment time of hormone, medium kind and the interaction between hormone kind and treatment time on rooting were studied by the orthogonal experiment design. The results showed that the best combination was A2B4C1D2 or A4B4C1D2. Cuttings were optimal in lower or higher crown with part leaves. They are treated by NAA in concentration of 100mg/kg for 2 minutes and then cut into compound medium of vermiculite and perlite with a ratio of 1:1 in volume. It was easy to root for green-wood cuttings at the maximal rooting rate of 96.25%. However rooting was not inevitably related to callus as an integrative rooting type.