Abstract:

Aquatic macrophyte community plays a very important role in the ecological restoration of lake,while,artificial aquatic macrophyte community is prone to the environmental disturbance and its stability was poor.So,it is important to study the structure and dynamics in the ecological succession of aquatic macrophyte community in order to establish restoration approaches for degraded vegetation communities.In 2003,the rehabilitation of aquatic macrophyte community was studied with physical and ecological engineering in the etrophic lake.The dynamics in the succession of aquatic macrophyte community had been investigated in the past three years.The result showed:only the aquatic macrophyte with wide niche could be introduced into eutrophic water as pioneer plant because of the water characteristic of high pollution and low transparency,as a result,the competition of species became intense so that one species was replaced by another species with their niche overlapping.The enclosure was dominated by one species during the same period.With the decline of niche overlapping,species niche was divided by the competition of species,interspecific relationship and community structure tended to be stable.However,it was possible that the species with similar growth period coexisted if the spatial location of species was separated.So the introduction of aquatic macrophytes with similar niche should be avoided.We should pay attention to the separation of seasonal and special structure of aquatic macrophytes.In addition,the stability of these common aquatic macrophyte communities was discussed by the competition of these species.However,the stability of community was influenced by multiple factors such as algae population,zooplankton population,macrobenthic population,fish population,microorganism population and sediment environment.These factors should be deeply studied in future.

Key words: aquatic macrophyte community/dynamics in the succession;/niche