Abstract: Adopting the method of centrifugal sequence sampling of seeds quantitative analysis on the mechanism of seed disperesal of Puccinellia chinampoensis Ohwi on alkalization meadow in Songnen Plain of China was conducted. Among the eight orientation that have been investigated, only the South-west orientation demonstrated a near-parent-plant seed disposal pattern, whereas seed disposal pattern of far distance from parent plants were found in the other 7 orientations. Correlative analysis had revealed that the seed number disposed in different orientations was positively correlated with the fair wind speed and the freguency of direction chang of wind during seed disposal. It indicated that P. chinampoensis fulfils its strategy of population development via wind media to expand its potentiality in the ecological space far from the parent plants. Seed disposal of P. chinampoensis exhibited a pattern of continuous distribution with an average disposed radius of 175 cm in natural condition in Songnen Plain of China.

Key words: Puccinellia chinampoensis, Mechanism of seed dispersal, Strategy of population, Wind factor, The Songnen Plain