土壤名词（Soil noun）.doc

土壤名词（Soil noun） Soil geography: it is the boundary subject of soil science and natural geography, and the study is the relationship between soil and geographical environment. The main content is to study the development, classification and geographical distribution of soil, which has reached the scientific basis for rational utilization and protection of soil resources. Individual soil: the three-dimensional entity of soil profile, the smallest volume of the soil, the area of the cross sectional area is approximately hexagon, and the area is usually 1-10 square meters. Soil structure: assemblage of aggregate in soil is called soil structure. Mensel color: a scientific method for describing the color of the soil in the color of the standard colorimetric method. The soil naming system USES three properties of color tones, measurements and saturation. CEC: soil cation exchange capacity, the total amount of cations that soil colloid can adsorb. Diagnostic layer: a specific layer of soil that is used to identify soil types and has a series of quantitative rules in nature. Noun explanation 1. Soil: the loose layer of the earths land surface can grow green plants, which have the characteristics of living conditions, fertility and self-purification. 2. Soil geography: is the natural geography edge between soil science and science, it is the special contradiction between soil and geographical environment as the object, studies the occurrence, development, differentiation and distribution of soil the science of law. Soil fertility: the ability of the soil to supply and coordinate the nutrients, water, gas and heat needed for normal growth and development of plants. 4. Soil circle: a continuum or overlay of soil covering the earths land surface and the bottom of shallow waters, like the earths membrane. 5. Soil ecosystem, soil and other upper complex between biological and underground part of matter and energy, place of migration, transformation and exchange form a dynamic bal