松嫩平原碱化草甸朝鲜碱茅种子散布机制的分析

采用顺序远离母株取样的方法，定量分析了松嫩平原碱化草甸朝鲜碱茅（Ｐｕｃｃｉｎｅｌｌｉａｃｈｉｎａｍ ｐｏｅｎｓｉｓ Ｏｈｗ ｉ）的种子散布机制。结果表明，在８个方向中仅西南方向表现为近母株散布距离，其它７个方向均表现为远母株散布距离的种子散布机制。经相关性分析，朝鲜碱茅向不同的方向散布的种子数量与种子散布时期顺风向的风速和风向频率呈正相关，反映了朝鲜碱茅是借助于风媒介实现了远母株距离扩展潜在生态位空间的种群对策。朝鲜碱茅向母株周围散布的种子呈连续分布格局的散布半径平均为１７５ ｃｍ 。

ANALYSIS ON THE MECHANISM OF SEED DISPERSAL OF PUCCINELLIA CHINAMPOENSIS ON ALKALIZED MEADOW IN SONGNEN PLAIN OF CHINA

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 .