Abstract:

The 30 mwaterlevefluctuationzone (WLFZ) in the Three Gorges Reservoir has the characteristics of seasonal reversal with large variations of altitude fluctuation and horizontal area.To protect and reconstruct the ecosystem of WLFZ is the world hot issue.It is widely accepted that WLFZ in urban area suffers intensive anthropogenic perturbations that impact ecological reconstruction of WLFZ.According to the different functions of WLFZ in urban areas,it is classified into three function areas:ecological landscape area,ecological barrier area and navigation junction area.Taking slope and elevation as the two major evaluating parameters,each type in the urban WLFZ is divided into:flat slope type (0~15°),gentle slope type (15~25°),steep slope type (>25°) and the elevation of 145~155 m,155~170 m,170~175 m.According to the functional partition and type classification of urban WLFZ,based on the principles and technologies of ecology restoration and plant configuration,ecological planning and protection of urban WLFZ are proposed.It is suggested that the urban WLFZ can act as multiple functions,e.g.the buffer zone that intercepting the transport of nutrients from terrestrial ecosystem to aquatic ecosystem,hydrophilic space,improving the urban landscape,etc.The results from this study will provide decisionmaking basis and scientific support for ecological planning of urban WLFZ in future