Abstract: As a kind of aquatic-terrestrial ecotone,lakeside zone plays an important role in the lake basin ecosystem,and has high ecological,social and economic values.Its functions include lake buffer,conservation of biological diversities and special habitats,dike protection from soil erosion,and economic and esthetics values.The main factors inducing lakeside zone degradation are the anthropogenic activities that caused the converse succession of communities and the decline of ecological function.The theoretical basis of ecological restoration and reconstruction of degraded lakeside zone is restoration ecology; while the technologies are of three types,i.e.,habitat restoration and reconstruction,species restoration and reconstruction,and structural and functional restoration.A three-year case study on the ecosystem restoration and reconstruction of degraded lakeside zone of Erhai Lake in Yunnan Province showed that the aquatic macrophytes were restored,purifying function was distinct,algae were restrained,and the component and individuals of zooplankton were changed.In a word,the biological diversity and stability in the degraded lakesidezone ecosystem increased after the restoration and reconstruction.

Key words: Nutrient, Nutrient limitation, Yellow Sea, East China Sea, Changjiang River estuary