Abstract: An investigation was made on the reproductive traits such as flowering, pollination, and seed-setting of smooth cordgrass (Spartina alterniflora Loisel.) in Tianjin coastal wetland. The results showed that the flowering of the grass initiated in mid-August, and senescence occurred by the end of October. S.alterniflora was a wind-pollinated grass, which was revealed by the adaptation of higher pollen/ovule ratio (P/O) (9874.67±2149.39) and the small pollen grains. Pollen viability presented an exponential downtrend with the time of pollen release, and the character of stigma adapted to capturing pollen grains. The exterior pollen tube growth following pollination showed the high capability of pollen germination. The average seed-setting rate was （67.56±2.39）% and the seed germination rate was above 80%, which was important for the population colonization and recruitment.

Key words: Bt transgenic rice, Arthropod, Guild, Community, Chemical insecticide