| The degeneration and imbalance of aquatic ecosystem is a global ecological disaster at present. F. ~toration of the damaged aquatic ecosystem of inland waters has been becoming one of the impoltant research projects in environmental science field. The submerged vegetation is looked as forest in the water. It is the key that the structure and function of aquatic ecosystem acts. Potamogeton crispus L. is a kind of common submerged vegetation which distributes widely in the world and has multiple utilizations and ecological functions. The objectives of the present study aimed to reveal the mechanism that P crispus L. purified eutrophic water, to investigate the reasons caused P crispus L. declined and the suitable living conditions of Pcrispus L., and to find an effective measures which harness the eutrophic lakes and reservoirs. Firstly, the purification ability of Pcrispus L. planted in the aquarium (glass tank) and in the enclosure in pond was determined. Secondly, the effects of water temperature, light density and pH on oxygen producted by Pcrispus L. were evaluated. Thirdly, the factors that affected the formation and germination of the turion of P crispus L. were detected.In eutrophic water (EN: 3.347mg1L; TP:O.682mg/L) Pcrispus L. was able to uptake NH4~-N, N03-N, N02-N and TP effectively. The absorption of NI-I4~-N was prior to that of N03-N. The higher the concentration of nutrition was, the faster the uptake velocity of P crisp us L. was. During the experiment period of I 5d, the removal rates on EN and TP were 89.8~-9l.7% and 73.9-~79.9% respectively. Compared with the control enclosure, the water quality of the enclosure in which Pcrispus L. grew was improved obviously. Content of EN, TP and Chl-a were decreased significantly (P |
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