改良红黏土持水性及植物性试验研究

Experimental Study on Water Holding and Vegetative Properties of Improved Red Clay Soil

摘要: 本文采用保水剂对红黏土进行改良，通过掺入不同含量的保水剂材料，对改良红黏土的持水特性、蒸发特性、植物适用性展开研究。试验结果表明：在持水蒸发特性方面，当按0.5%、1%、3%、5%的质量分数掺入改良材料时，红黏土最大持水量显著提升，保水剂对持水性改善效果明显；同时随保水剂含量增加红黏土保水能力提高，但改良材料超3%后，其比表面积特征会使土体与空气接触面增大，导致抗蒸发能力降低，抵抗蒸发的最佳改良材料配比为3%。在植物适应性研究中，随保水剂掺量增加植物发芽率逐步上涨，且保水剂掺量较高组植物株长势良好，未改良红黏土组及低掺量组存在倒苗现象，添加保水剂对植物生长的积极作用主要源于其良好的持水保水特性。

Abstract: In this paper, red clay was improved with water retaining agent. By adding different contents of water retaining agent, the water retaining property, evaporation property and plant applicability of the improved red clay were studied. The test results show that the maximum water holding capacity of red clay is significantly increased when the modified material is added with the mass fraction of 0.5%, 1%, 3% and 5%, and the water holding capacity is obviously improved by the water retaining agent. At the same time, with the increase of water retaining agent content, the water retaining ability of red clay is improved, but when the modified material exceeds 3%, its specific surface area characteristics will increase the contact surface between soil and air, resulting in a decrease in evaporation resistance. The optimal ratio of modified material to resist evaporation is 3%. In the study of plant adaptability, the germination rate of plants increased gradually with the increase of water retaining agent content, and the plant growth was good in the higher water retaining agent content group, while the seedling was reversed in the unimproved red clay group and the low water retaining agent group. The positive effect of adding water retaining agent on plant growth was mainly due to its good water retaining characteristics.