Abstract: In this study,Rana chensinensis tadpole was exposed to Cd²⁺containing tap water and deionized water,and the 50% lethal concentration (LC₅₀),100% lethal concentration (LC₁₀₀),0% lethal concentration (LC₀),and safe concentration (SC) at 24,48,72 and 96 h were determined.The results showed that the death rate of R.chensinensis tadpole increased with Cd²⁺ concentration and time,and the toxicity of Cd²⁺ was stronger in deionized water than in tap water.After put the tadpoles of stage 26-27 in the tap water under Cd²⁺ safe concentration (0.05,0.1,0.2,0.4 mg·L^-1),the increment of their average weight and length was decreased with increasing Cd²⁺ concentration,and the duration for heteromorphosis became longer,indicating that even under Cd²⁺ safe concentration,the growth and metamorphosis of R.chensinensis tadpole could be still delayed and disturbed.

Key words: Artificial oases, Potential pattern, Actual pattern