Phenotypic plasticity and modular biomass of invasive Parthenium hysterophorus in different habitats in south China Characters and dynamics of modular biomass and its allocation ratio in five cultivars of elephant grass Effects of Different Grazing Intensities on the Distribution of Seriphidum transiliense Modular Biomass Individual and modular biomass dynamics of Kingdonia uninflora population in Qinling Mountain A comparative study of plant biomass in a native grassland exclosure