Effect of Suaeda glauca Purifying Seawater From Marinelands Varying in Eutrophication Degree

To search for a practical economical phytoremediation strategy for remediation of hyper-eutrophied sea water discharged from marinelands in the areas of costal tidal flats in China, an in-lab simulated aqucultural experiment was conducted on biomass production and nutrient removal efficiency of Suaeda glauca in eutrophied sea water. Results show that the plant growing in the hyper-eutrophied water with TN and TP reaching 2.4 and 0.05 mmol·L^-1, respectively, turned out the highest biomass, either dry or fresh, or significantly higher than those growing in moderately eutrophied water with TN and TP reaching 1.6 and 0.03 mmol·L^-1, respectively or low-eutrophied water with TN and TP reaching 0.8 and 0.01 mmol·L^-1, respectively during the experiment. TN and TP removal efficiency of the plant reached 73.2% and 74.4%, separately, and declined with rising TN and TP concentrations in the eutrophied water. In addition, biomass, N and P contents and accumulation of all organs of Suaeda glauca were analyzed, with results suggesting that Suaeda glauca as a pioneer annual species in coastal tidal flats could be used to remedy hyper-eutrophied sea water as tail water from marinelands.