[Growth of modules and survival space enlargement of Leymus secalimus clones under cultivated conditions in Songnen Plain of Northeast China: an experimental research].

Leymus secalimus is a kind of rhizome grass and a species of typical clonal plant. The study showed that under cultivated conditions in the Songnen Plain of Northeast China, the growth of four test L. secalimus clones is with great plasticity. After 153 days of growth in the year of transplanting, the clones had 215 tillers in maximum and 40 tillers in minimum, and the growth pattern accorded with exponential function. The number and biomass of the tillers, rhizomes and buds, as well as the variations of their quantitative characters and of the survival space of the clones in two growth seasons all presented good regularity. The tillers number was in a power allometry growth with the increase of clonal diameter, and the biomass of tillers and rhizomes as well as the number of buds were all in an exponential allometry growth with the increase of the diameter. The number and biomass of the tillers and rhizomes were all in a linear isogony growth with increasing survival space of the clones. When the space was enough and no interspecies competition existed, L. secalimus clones survived first and developed then, and well exercised continuing updating potency.