[Effects of Submerged Macrophytes on Different Phosphorus Fractions in Overlying Water and Interstitial Water]

The effects of Myriophyllum spicatum L. with developed root systems and rootless Ceratophyllum demersum on the concentration and proportion of different phosphorus fractions in the overlying water and the interstitial water were investigated by batch simulation experiments. The effects of different types of submerged macrophytes on the phosphorus fraction in the overlying water and interstitial water were explored. The results indicated a significant influence on the concentration of dissolved phosphorus in the overlying water and interstitial water by the growth of Myriophyllum spicatum L. and Ceratophyllum demersum. ① The absorptivities of DTP, SRP, and DOP by Myriophyllum spicatum L. in the overlying water were 7.0%, 11.7%, and 3.5%, respectively, and in the interstitial water were 20.8%, 12.5%, and 48.4%, respectively. ② The absorptivities of DTP, SRP, and DOP by Ceratophyllum demersum in the overlying water were 30.3%, 54.9%, and 13.2%, respectively, and in the interstitial water were 19.3%, 3.8%, and 30.4%, respectively. ③ The content of SRP in Myriophyllum spicatum L. group, Ceratophyllum demersum group, and the control group decreased 13.0%, 34.0%, and -0.9%, respectively; the PP increased 18.2%, 33.1%, and 4.2%, respectively; and the DOP increased 7.2%, 17.68%, and -4.35%, respectively. The results provide reference for eutrophic lake ecologic restoration.