Abstract: Shandong province is located at 34°25′～38°23′N and 114°36′～122°43′E . It is typical continental monsoon climate, with absolute minimum temperature of -11～-25℃ and maximum of 39～43℃, annual precipitation of 550～950 mm and frostless days of 180～220day. The main soil kinds are braw nealth, cinnamon and saline alkli. Annual growth of breast-height diameter and length for younger trees of introduced Eucommia ulmoides are ≥1.00cm and ≥0.80m; for the mature trees are≥0.56cm and≥0.35m, respectively . The seed yield is 41g for 13 years old tree and 2500g for 23 years old tree. Seed quality is good with thousand-seeds weight of 97.0g and germination rate of 60%～80% .The growth charact eristics and barkg rowth of introduced trees are similiar to ones of the originated trees, while seed yield and quality are better than ones of originated trees.

Key words: platinum group elements (PGEs), anthropogenic emission, distribution, toxicity, migration, environmental risk.