In order to identify the soil microbial on the extent of saline and alkaline reaction of soil quality,microbial flora,seasonal variation,composition and microbial diversity of alkalization and salinization soil were studied using plate dilution and Biolog microbial identification system of the Yinchuan plain in Ningxia.The results of micrbial flore,seasonal change,structure and composition and the relationship between number of microbial and soil nutrient of different type and degree saline-alkali soil in N...