Therefore, it is helpful for our learning biogeochemical cycling of mineral elements and its ecological and environmental effects, and of great importance for agricultural production and environmental protection to study behavior of mineral elements during weathering and pedogenesis of rocks and environmental quality.

According to the comprehensive analysis of granularity of eolian loess at Dazhuka Country,Tibet,the climate change in this area can be divided into warm and wet climate,dry and windy,warm and dry,dry and windy,mild-dry and slightly wet,warm and wet.

The authors consider that speleothems aren t all karst deposits, butsome is the eolian loess.