Cause of variable charge: A. Dissociation of hydrous alumino-silicate B. Removal of H+ ions from OH groups on various types of mineral surface C. The dissociation of hogen ions(H) from the functional associated with soil organic matter D. The oxides and hydrous oxides of iron and aluminium, the short-range order aluminosilicates and the edge face of clay minerals can all give rise to variable charge in this way
Cause of variable charge: A. Dissociation of hydrous alumino-silicate B. Removal of H+ ions from OH groups on various types of mineral surface. C. The dissociation of hyogen ions (H+ ) from the functional associated with soil organic matter. D. The oxides and hydrous oxides of iron and aluminium, the short-range order aluminosilicates and the edge face of clay minerals can all give rise to variable charge in this way
(=) The charge quantity of the soil 1. The soil charges exist in parts of soil colloid 2, The composition of soil colloid 3. The interaction of soil colloid
（二）The charge quantity of the soil 1、The soil charges exist in parts of soil colloid 2、The composition of soil colloid 3、The interaction of soil colloid
Affect the factors of charge quantity of the soil A. Texture B. Types of soil colloid C pH value
Affect the factors of charge quantity of the soil: C. pH value B. Types of soil colloid A. Texture