Abstract: Nutrient elements are necessary for the sustainability of environment,while excessive nutrients have potential impacts on the stability of wetland ecosystem,especially on the dynamics of wetland plant communities.The nutrients in wetland habitat decide the growth of its plants,and the dominant species and their richness of plant communities.Accumulation of nutrients has significant effects on the primary productivity,biomass and its allocation,and species diversity of wetland plants.Water is the key factor in wetland system,and the fluctuation of water level affects wetland structure and characteristics.Species composition,species diversity,and plant community succession all show significant responses to moisture content and water level fluctuation in wetland.Nutrients and water level fluctuation are the important factors determining the composition,structure,and function of wetland ecosystem.Some research proposals in the future were put forward in the paper.

Key words: Cotton, Fiber quality, Eco-factor, Quantitative relationship