Abstract: By the method of sand culture, this paper studied the effects of different concentration chromium(Ⅲ) (0, 100, 200, 300, 400, 500, 600, 800 mg·L^-1) on the matured hypocotyl germination and seedling growth of Avicennia marina on 25, 45 and 150 days of treatment. The results showed that the germination of matured hypocotyl was not obviously affected by Cr(Ⅲ) during the early germination period. When the stress reached 45 days, the growth of stem height, root, and component and total biomass was decreased with increasing Cr(Ⅲ) concentration, but the decrement was not remarkable. With the stress prolonging to 150 days, low Cr(Ⅲ) concentration (100 mg·L^-1) didn’t have obvious negative effects on the seedling growth, but > 100 mg·L^-1, especially >200 mg·L^-1 of Cr(Ⅲ) inhibited the growth of root, stem length, leaf size, and biomass distinctly, and the effects would be more severe with extending stress time.

Key words: Paddy field, NH₄⁺, NH₃^-, Total N, Dynamic feature, Simulation