Abstract: Restoration succession of wetland soils and their changes of water and nutrients were studied with field investigation and laboratorial analysis to explore the effect of ecological restoration on wetland soil evolution and soil fertility in Ruoergai Plateau.The results indicated that there was an ecological succession of wetland soil types and its restoration successive series followed the order of aeolian sandy soil,meadow,bog soil and then peat soil.With the water restoration in wetland,the contents of available soil water,total soil N,P and available N,P,K increased,while there was no obvious change in total soil K.The distribution of total N,P and available N,P,K on soil profile showed surface layer (0～20 cm)>subhorizon (20～40 cm)>ground layer (40～60 cm) except the total soil K.There was a high coordination between the changes of available water,nutrients and wetland ecological environment in Ruoergai Plateau.Wetland ecological restoration was helpful to the improvement of soil fertility.

Key words: Sogatella furcifera, Insect-resistant rice varieties N₂₂, Ecological adaptation, Activities of protective enzymes