Abstract: Culture experiment with seedlings of 28 wheat and 14 soybean varieties or strains shows that there exists a significant intraspecific difference in Cd tolerance. The tolerance of varieties are related to their lower Cd content or lower transported Cd proportion in their aboveground parts. Some varieties with higher absorbed Cd can still grow normally, and thus, may have a Physiological mechanism to weaken the toxicity of Cd through lowering its activity.

Key words: Crop, Cd tolerance, film mulching, hilly area of central Sichuan basin, root distribution, yield, spring maize, ridge-cultivation