Analyse of the modular structures of populations on Leymus chinensis and Hierochloe glabra in different succession series in cutting grassland

This experiment studied the modular structure of populations on Leymus chinensis and Hierochloe glabra in the spatial succession series that were investigated in the cutting grassland in Songnen Plain of China.The results showed that winterness tillers were dominant in the realistic populations of L.chinensis and H.glabra in the middle days of May.The proportion of their winterness tillers were 98.6%~100% in L.chinensi population and 97.6%~100% in H.glabra population.The buds of tiller nodes were 34.1%~61.0% and 30.8%~73.9%,and the buds of their rhizomes were 49.0%~65.9% and 26.1%~69.1% in the potential populations of L.chinensis and H.glabra respectively.The export percentages of the buds were 34.7%~38.3% in L.chinensis population and 25.7%~43.9% in H.glabra population.The rhizomes of the 1st age class of two populations had not been formed by then.The cumulate length and biomass of their rhizomes were mainly the 2nd age class.The renewal capability of population of L.chinensis was better than H.glabra.With the increasing of the number of L.chinensis,the number of L.chinensis were declining incessantly in these succession series.With the increasing of succession time,the population of L.chinensis would become the dominant population instead of H.glabra in this cutting grassland.