Affiliation: | BAI Zhanguo~(1,2) and WAN Guojiang~1 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2. State Key Laboratory of Plant Nutrition Research of Chinese Ministry of Agriculture Institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, Beijing 100081, China |