On basis of a great number of the analysis da-ta of soil samples, the distribution trend of background value and the main effecting factor of Ti, Zr. Hf. Ta in different soil types and regions were discussed in this paper.

• 在大量土壤样品分析数据的基础上；讨论了钛、锆、铪和钽在不同土类和地区的环境背景值的分布趋势和主要影响因素.