Abstract:

Stimulated experiments were carried out to study nitrogen and phosphorus uptake and removal ability of 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.in eutrophic waters.The results showed that 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.grew normally in different degrees of eutrophic waters with initial concentrations of 245-941 mg/L TN and 044-153 mg/L TP.Accumulated 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.fresh weight and dry weight increased to 16433-1934g and 857-1053 g for the period of study，the specific growth rate of fresh weight and dry weight were 044%-119%/d and 046%-14%/d，the ramet rate of 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.was 133%-362%/d. The removal of nitrogen and phosphorus were 6920-31860 mg and 1560-6600 mg and nitrogen and phosphorus uptaken by 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.were 352-20821 mg and 899-4837 mg，respectively.Meanwhile，accumulated assimilation of nitrogen and phosphorus increased with increasing initial nitrogen and phosphorus concentration in eutrophic waters.The removal contribution rate of nitrogen was 5326-6524% and that of phosphorus was 5958%-7419% in different degrees of eutrophic waters，respectively.Therefore，〖WTBX〗Pistia stratiotes〖WTBZ〗 L.had good removal efficiency，and planting 〖WTBX〗Pistia stratiotes〖WTBZ〗 L.in eutrophic waters could improve water quality