Age Structures of Modular Biomass of Leymus secalimus Populations in the Different Stages of Vegetative Restoration on Coal Ash Storing Pools of Thermal Power Plant, Kerqin Steppe Region The Effect of Fertilization on Young Clone Plantation for Eucalyptus urophylla Biomass structure and production pattern of Hordeum brevisubulatum clonal modules under cultivated condition in the Songnen Plains Biomass allocation and growth analysis on the ramets of Phragmites communis populations in different habitats in the Songnen Plains of China Age structure of tillers of Hordeum brevisulatum clone in Songnen plain of China ANALYSIS AND MEASUREMENT OF THE FITNESS OF SEED REPRODUCTION AND VEGETATIVE REPRODUCTION OF CLONAL PLANT