土壤质地是土壤的基本性状,也是土壤物理特征的一个综合指标。质地的变异,直接影响土壤性质、土壤发育和土壤肥力的变化。确定土壤颗粒组成分异度,有利揭示质地特征,对提高土壤肥力有直接关系。研究土壤质地分类,不论在理论上或在生产实践中,都具有重要的现实意义。关于土壤质地分类问题,曾有不少国家对土壤颗粒组成和分析方法有过较长时间的研究,在共同研究的基础上确定了国际制的土壤质地分类。嗣后,有的国家又相继拟定了适合本国的质地 Soil texture is the basic characteristics of soil, but also a comprehensive index of soil physical characteristics. Texture variation directly affects soil properties, soil development and changes in soil fertility. Determine the composition of soil particle composition, revealing the texture characteristics of a direct relationship to improve soil fertility. Studying soil texture classification has important practical significance both in theory and in production practice. On the classification of soil texture, many countries have had a long time on soil particle composition and analysis methods, based on the common study to determine the international classification of soil texture. Subsequently, some countries have successively formulated the textures suitable for their own country