比表面是土壤的一项重要特征。它与土壤物理、化学性质密切相关,并且直接影响土壤保持和供应作物所必需的养分和水分的能力、土壤结构状况等。但是,这一重要的土壤肥力特性,在我国研究较少。其主要原因是比表面测定方法不及测定阳离子交换量那样简便易行。近年来,由于简易的乙二醇乙醚吸附法出现,以及随着氮气吸附法的日趋完善,生产出商品 Specific surface is an important feature of soil. It is closely related to the physical and chemical properties of the soil and has a direct impact on the ability of the soil to maintain and supply nutrients and moisture necessary for the crop, and the soil structure. However, this important feature of soil fertility is less studied in our country. The main reason is that the specific surface area measurement method is not as simple and convenient as measuring the cation exchange capacity. In recent years, due to the simple ethylene glycol ether adsorption method appears, and as the nitrogen adsorption method is maturing, to produce goods