Abstract: In order to rebuild the aquatic vegetation in the East lake of Wuhan,experiments on its natural restoratin and artificial structural optimization were carried out in two large enclosures and one fence. The aquatic vegetation in enclosure and fence was restored in two years. Its monthly average biomass was about 2 times larger than the control,and the aquatic vascular plants were naturally increased 3～6 species. The floating plants could easily settle down and reproduce,and Spirogyra and Cladophora could grow easily. In the naturally restored aquatic vegetation, Myriophyllum spicatum and Trapa incisa were dominant species with no emerged plants and an unsatisfactory community structure. Through rational selection and plantation of plant species,the aquatic vegetation and its structure could be restored and improved faster.It was found from our preliminary experiments that Nelumbo nucifera,Phragmites communis,Vallisneria spiralis,Mgriophyllum spicatum and Ceratophyllum demersum had a good adaptability. They could be selected as the pioneering species to rebuild the aquatic vegetation in East Lake. The vegetation structure mainly consisted of submerged plants was better. To limit fish culture was a prerequisite for aquatic vegetation restoration.

Key words: Enclosure, Fence, Aquatic vegetation, Restoration, Structural optimization, reclamation, farmland management, carbon emission, life cycle assessment