Discussion of Wetland of Ecological Construction and Protection After Development of the Sanjiang Plain

The Sanjiang Plain is the biggest marsh-wetland in our Coutry,but along with the large exploit of agriculture,the area of wetland fall sharply from the original wetland which is more than 30 000 km2 to the 448 9 km2 which is only in the natural reserve.The article discuss the current situation of distribution of wetland in Sanjiang Plain and elaborate importance of protection of wetland,thereby,which define the goal of which is back to the primary wetland and the mechanical control measure which is back to the wetland in order that the wetland can get the forest.