This study investigated the spatial and seasonal niche characteristics of the dominant wetland plants in Napahai wetand.Under each disturbance regime,three plots were selected in 2011,and the data were collected in May,July,and October of the year.The results showed that there was a seasonal variation in species niche values under three different disturbance regimes.In spring,the order of the variation in niche breadth (from the highest to the lowest) is Polygonum lapathifolium (0.9731) >Blysmus sinocompressus (0.8040) >Plantago depressa(0.6468) >Cardamine impatiens (0.5021).In summer,the order is changed into Plantago depressa(0.8674) >Cardamine impatiens (0.8581) >Blysmus sinocompressus (0.8440) >Polygonum lapathifolium (0.7814).In fall,the order is Blysmus sinocompressus (0.9698) >Polygonum lapathifolium (0.7730) >Plantago depressa (0.6650) >Potentilla fulgens (0.6647).Similarly,niche overlap and niche differentiation also alter remarkably with seasons.The lowest niche overlap and the highest niche differentiation occur in spring and fall,whereas the highest niche overlap and the lowest niche differentiation occur in summer.Our results provide important information in regard to plant community composition,structure,dynamics,and diversity in Napahai wetland under different disturbance regimes,and help the understanding of the sensitivity of varying wetland plants in responses to different disturbances.