Abstract: Based on investigating natural wetland plant community of Binhai New District in Tianjin,and calculating the important values of the dominant species pertinent to every community,the study on wetland plant communities and their distribution was carried out.Moreover,the relation between wetland plant communities and the main environment factors was analyzed by means of Canonical Correspondence Analysis.The results showed that:(1)Together with distance to water,the salt content and pH value in soil were the major environment elements which controlled the distribution of wetland plant communities in Binhai New District;(2)There was correlation between the three main environment factors,and the distance to water redistributed the soil physicochemical factors in terms of quantities,which resulted in the existing situation of wetland plants;(3)The distribution of the dominant species was resemble to the one of plots,and the distribution of the dominant species decided the structure of different types of communities to some extend.

Key words: Binhai New District, wetland, dominant species, Canonical Correspondence Analysis