Environment Changes of Analysis on the Hydrographic and Water Resources of Marsh Wetland in the Sanjiang Plain

A study on marsh wetland through their own hydrographic characteristics and water balance equation,the affecting factor on the changes of marsh wetland are analyzed in detail in the Sanjiang Plain.It is put forward that human activities disturbance has lead to the hydrographic and water resources environment changes directly,continuing reduction in area and loss in ecological function of wetland.The necessary measures should be taken to control the ecological environment change to be worse in the Sanjiang Plain.