ased on the theory of disturbance ecology and the principles of opitimization , an opti-mum accumulation method has been developed which can be used to determine the cycle offires occurring in treeless meadow grassiands. After a grassland fire,the grassland ecosystemwill have its characteristics contineously changed with gradually accumulating litters. If thelitter,related to a fire has a vield of A and is accumulated at a rate of R,then the litter will beaccumulated to an optimum amount of C in N years be...