通过测定黄土高原广泛分布且具有代表性的黄绵土、黑垆土及 土娄 土的颗粒组成、结构性、孔性、物理机械性等土壤物理性质 ,研究了黄土高原呈地带性分布的 3种土壤其物理特性之间存在的差异及呈现的规律性。同时 ,还着重分析了重壤带的 土娄 土在不同肥力水平下其物理性质的变化规律。这些研究进一步丰富了对这些土壤相关知识的认识 ,并为农业生产中合理利用土地提供了基本依据 The three kinds of soils distributed in the Loess Plateau were studied by measuring the grain composition, structure, porosity, physical and mechanical properties of the loess, black loess and soil that are widely distributed in the Loess Plateau. The differences between the physical characteristics and the regularity presented. At the same time, it also emphatically analyzes the changing law of the soil properties of soil in the heavy soil zone at different levels of fertility. These studies further enrich the understanding of these soil-related knowledge and provide a basic basis for the rational use of land in agricultural production