Abstract: This study is concerned with measuring intensity of gross solar radiation, reflected radiation, transmitted radiation and rate of net photsynthesis, dark respiration and transpiration by fixed position and fixed quantity. Finally, the measurement results were converted into the energy contents. The results show that the process of the energy flow through Leymus chinensis population is a bioenergetic process that solar radiation is absorbed, fixed, transformed, dissipated and accumulated by Leymus chinensis population. In the process of the energy flow, the energy in put is 5199 kcal/m2·d; the energy consumption is 5132.31 kcal/m2·d and the energy accumulation only is 66.69 kcal/m2·d. Thus it can be seen that most of the energy are lost in the process of the energy flow. As a result of the stability analysis, the equilibrium state in the process of tile energy flow is asymptotic stability. This result shows that the stability mechanism of the equilibrium state is the negative feedback mechanism. It means that the Leymur chinensis population has an ability of self-regulation that can resist perturbation and maintain its equilibrium state, so as to keep normal energy flow through the Leymus chinensis population.

Key words: Leymus chinensis, Energy flow, Stability analysis, Equilibrium state, Asymptotic stability