Age structure of modules on Calamagrostis pseudophragmits population in Huocheng County

Calamagrostis pseudophragmits is a perennial, rhizomatic and typical clone grass. Components and age structure of modules of C.pseudophragmites populations were studied at the end of growth season in different habitats in the Gully Mountains in Huocheng County of Xinjiang, China. It was found that the tiller nodes of C.pseudophragmits in three habitats kept alive as long as for 6 year, and there were five age classes of tillers which showed a stable age structure. Viewing the general conclusions as a whole, the productivity of per tillers in the second habitat (H2) was significantly higher than those of the third habitat (H3), the least was 2nd (H1), and there were significant difference among different habitats which showed that some difference of productivity per tiller occurred in different vegetations (P0.05). The cumulate length of rhizomes and its biomass was the highest for the oneyearold class, and it decreased with an increased age, the storage of dry matter within per meter rhizome was the highest for the 1st (in H1) or 2nd (in H2 and H3) age class. The results showed that loosen and damp sandy soil was advantageous to the growth and storage of dry matter in rhizomes.