Abstract: This study investigated ramets, rhizome, and rhizome buds of Phragmites australispopulation in xeric, wet, aquatic, and saline-alkali habitats in Zhalong Wetland by clipping and digging samples. The results showed that ramet density, rhizome length, and the storage, input and dormancy of rhizome buds were the largest in wet habitat while they were the lowest in salinealkali habitat from June to October. The output of rhizome buds was the largest in aquatic habitat and the lowest in saline-alkali habitat. The differences of module numbers among the four habitats and their differential order were relatively stable, suggesting significant environmental effects and a great plasticity in the module level. Meanwhile, different modules coevolved. Ramet density was significantly positively correlated with rhizome length, and storage and input of rhizome buds, but negatively correlated with the amount of rhizome bud dormancy. There was a significantly positive correlation between storage, input and output of rhizome bud and rhizome length. The ramets were formed by the germination of rhizome buds, with the contribution rate of rhizome bud to ramet being 100%. More than 80% of rhizome buds formed new rhizomes. The growth of rhizome can form more rhizome buds. The substitute and change of morphological structure of different components maintain the stability and continuous renewal of the population.

Key words: beneficial microorganism, landscape, ecosystem service., parasitoid, predator