Abstract: To compare the removal effects of N, P from eutrophication water by wetland plants. The uptake dynamics characteristics of NO3-N, NH4-N and P by four types of wetland (Water hyacinth, Acorus calamus, Ipomoea aquatica, Ceratophyllum demersum) were studied. The results showed that the four wetland plants showed significant difference in the water N, P uptake , and the maximum absorption rate of NH4-N showed as Water hyacinth> Ipomoea aquatica> Acorus calamus> Ceratophyllum demersum while the maximum absorption rate of NO3-N was Water hyacinth> Ipomoea aquatica> Ceratophyllum demersum> Acorus calamus. Meanwhile, the maximum absorption rate of P was Water hyacinth> Ipomoea aquatica > Acorus calamus> Ceratophyllum demersum. Furthermore, the affinity of nitrogen and phosphorus uptake rate of four wetland plants showed opposite trend with the absorption rate．

Key words: wetland plant, polluted water, uptake dynamic