The content sequence of soil mineral elements in southern Ningxia is SiO2>Al2O3>CaO>Fe2O3MgO>K2O>MnO>Zn>Cu.The space distribution of Si

A1

Fe and Ti is relatively even.Ca

Mg

K

etc.have apparent variations and uneven space distribution.It shows that residual parent materialsdeluvial parent materialsloess parent materials in Si

Ti

Cu

Zn and Mn element content;alluvial parent materialsresidual parent materialsloess parent materials in regard to Fe

Mg

K；diluvial and alluvial parent materialsloess parent materialsresidual parent materials; as to Al

diluvial and alluvial materialsresidual materialsloess;and that Ca is highest in loess parent materials and lowest in residual parent materials.From mountain area to diluvial fan

to upper reaches terrace

to medium and lower reaches terrance

Si

Cu

Zn

Mn element content decreases gradually but Al

Mg

Fe

Ca

K increases continually.