土壤亲水性的初步研究

A PRIMARY STUDY ON THE SOIL HYDROPHILICITY

摘要:

土壤的亲水性是土壤胶体的一个重要属性.它不仅与土壤胶体的许多其它重要性质(如胶体的分散、絮固、胶溶、胶凝和老化等)密切相关,而且对土壤的结构特性,水分状况和吸附性能等也有一定的影响.在农业生产上也有其重要的实际意义.土壤胶体颗粒具有亲水性主要在于它的水合作用.

Abstract:

Present paper proposes a new characteristic index-the hydrophilicity value of soil (H) for studying soil hydrophilicity,and introduces its measuring method.H value is defined as a ratio of the volume of water to the volume of CCl₄,both of which are held by an unit quantity of soils.The magnitude of the H value was mainly related to the component of clay minerole in soils.The results obtained showed that H value was in following descending order:bentomite>kaolinite;chernozem>yellow brown earth and neutral paddy soil>red earth>laterite.The time needed to attain an equilibrium state of water holding of soils are positively correlated with the magnitude of H value.