The mechanism of dynamics of productivity of community from the angle of energy ecology was investigated.The results show that there were the same dynamics between biomass and standing energy quantity of community,and they all get the maxmium at the beginning of September.The photosynthetic strength of Artemisia ordosica was bigger in July and August than in any other months.so were the increasing rate of standing energy,growth rate of biomass and the converting rate of standing energy of aboveground co...