Study on element geochemistry of Limestone soil in liujiang drainage area

Based on field investigations on typical soil profiles and samples, the elements geochemistry and its regularity of limestone soil in Liujiang drainage area were analyzed, and the possible factors were provided, which present the basis of formation and evolution for soil profiles. The results showed that:(1)The contents of silicon and aluminum are taking larger proportion than the Na, Mg and Ca's; the limestone soil is weakly alkaline; there is positive correlation between pH value and the content of Ca and Mg, but negative correlation between pH value and the content of microelement.(2)The contents of organic carbon and N decrease with the depth of soil profile, while the K, K2O, pH are opposite. (3)The contents of microelements are greatly higher than national average, but safe. (4)Both organic carbon and pH value are affected by vegetation covered above.