关键词: 高寒草甸, 土壤水分动态变化, 模拟, 谐波分析

Abstract: The dynamics of soil water content during plant growth peried can be decomposed into two parts:periodic term and random fluctuation term. In this study, simulation treatment of time sequence wasearried out by using method of harmonic analysis to periodic term whereas linear regression was established to random fluctuation term vs. Natural precipitation by using obervation data of soil water contentduring 1992. Predictive simulation equation of dynamics of soil water content during 1992. Predictive simulation equation of dynamics of soil watent content in alpine meadow was set up by using plus modal method. Regressive simulation was used for the date of soil water content of 1992. The predictive imitation the was very high. The mean relative error is 7.2%. prediction for the dynamics of soil water content of1993, the accurate rate was very high the, and it’s mean relative error is 8.9%. This result showed that the simulant model equation can predict the dynamics of soil water content accurately, and it also can guide the livestork farning. So the study on the ecology of eneng cycle of grassland matter has a great actual price.

Key words: Alpine meadow, Dynamics of soil water content, Simulation, Harmonic analysis