Abstract
Litter dynamics of grassland ecosystems was studied by modelling. Dynamics of litter production, decomposition and accumulation is described by a general mathematical model: dX(t) dt = g(t) − k(t) · X(t) , where t is time, X(t) is litter biomass, g(t) is production rate and k(t) is decomposition rate. The litter long-term dynamics characters in grassland ecosystems were analysed. 1. (1) If yearly decomposition rate and yearly input are steady, then the litter goes to steady state. The litter will gradually rise to steady state if yearly input is more than yearly decomposition. It will gradually decrease to steady state if yearly input is less than the yearly decomposition. 2. (2) If the decomposition rate and production rate all change periodically, then the litter will reach a periodically changing state.
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