Abstract: To investigate the growth status of typical wetland emergent plant Typha angustifolia L. and its characteristics of arsenic (As) accumulation and migration, As₀, As₅₀, As₁₅₀ and As₆₀₀ (corresponding to 0, 50, 150 and 600 mg·kg^-1 As of sediment) were set up to study the growth and development, As accumulation characteristics of T. angustifolia L. during the life cycle (growth period, maturity period and yellow wilting period) and the effect of As extraction from soil. The result showed that T. angustifolia L. could complete its life cycle and formed seed stigma under four levels of As stress. In the growth stage, the root tolerance index (IT) of T. angustifolia L. under As₅₀ treatment was the highest, reached to 132.38%, and the biomass of T. angustifolia L. under As₁₅₀ treatment was 19.12 g, 34.08% higher than that under As₀ treatment, the biomass accumulation under As₆₀₀ treatment was 12.35 g, which was 13.39% less than that under As₀ treatment, at this time, typha IT was the smallest, which was 65.23%; In the mature stage, the biomass accumulation of typha under As₅₀ treatment was the highest, reaching 72.23 g, 28.70% higher than that under As₀ treatment, at this time, IT of typha was the highest, reached to 149.25%; The biomass accumulation and IT under As₆₀₀ treatment were the lowest. In the yellow wilting stage, the biomass accumulation and IT of typha under As₅₀ treatment were the highest, reached to 79.23 g and 119.28%, respectively; The biomass accumulation under As₆₀₀ treatment was the lowest, 13.47% lower than that under As₀ treatment. In the three stages, GSH activity of typha was the highest when As content was 0-50 mg·kg^-1 in the sediment, and F_v/F_m in As₅₀ and As₁₅₀were higher than that in As₀; F_v/F_m in A₆₀₀ was the lowest, and SOD activity and MDA content were the highest in the leaves; The bioaccumulation coefficient (BCF) of As in the underground part of typha was higher than that in the aboveground part, the transfer coefficient (TF) between plants was 0.09-1.10. The As fixed rate (ER) in the sediment of typha was higher than the removal rate (RR), and there was a significant positive correlation between the amount of extraction (EA), the amount of migration per unit area (M_PUA) and the amount of As in the sediment. Typha culd endure high concentration As stress and grow normally, and had good remediation effect on the sediment of As polluted wetland. It could be planted as a wetland plant establishment species in As polluted wetland, and could increase the number of harvest and replacement of typha before the yellow wilting stage to obtain better remediation effect.

Key words: wetland, As pollution, emergent plant, growth, enrichment characteristic