The authors have made observation and study on the Fire Succession of three subtypes of meadow vegetation which distributes in the mountain ranges of Southern Gansu, with the purpose to evaluate the influence of fire to the productivity of this type of vegetation. The results are as follows;1. After burning, the production of forage grass in green -weight increases by 14.35% on an average and the increasing rate of true meadow subtype reaches the value of 18.77%;2. In Spring, the forage grasses of these mea...