摘要：

Deyeuxia angustifolia, swamp meadow and Deyeuxia angustifolia+Carex schmidtii meadow swamp are the main body of the grassland in forest area of Northeast China. The seasonal dynamics of above-ground biomass of thc two types of the grasslands are discussed in this paper. With the help of the IBM PC/XT microcomputer, the simulation models of the seasonal dynamics have been made out.B_1=115.5035-18.5653t+0.8012t~2for Deyeuxia angustifolia swamp meadow.B_2=106.5727-25.5288t+0.9531t~2for Doyeuxia angustifolia +Carex schmidtii meadow swamp.In the last part of the paper, the absolute and relgtive growth rate of the above-ground biomass of the two types of the grasslande aredelt with.

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