Hordeum brevisubulatum is a typical clonal plant of grass family with short rhizome. It was widely spread in the alkali-saline meadow in the Songnen plains of China, and there were some biological-ecological and productive characters, such as the tough alkali-saline environment endurance, vigorous vegetative reproduction, long vegetative period after fruit and high value of forage nutrition. In term of the modular theory of plant population, perennial plants all lived through cold winter by hibernated mod...