Abstract: Measuring of the seasonal changes of the above-and under-ground biomass of kobresia humilis meadow, and analyzing of the relationship between the meteorological factors and seasonal changes of k. humilis biomass were done in order to set up a simulant model of above-ground biomass seasonal changes. The result shows that the k. humilis meadows undergo five phases of bourgeoning, turning green, vigorous growth, stabilizing, and shrivelling and declining in a year. From May through September, the under-ground biomass adhered to the routine of rising, then dwindling, and rising again, all with considerable scales. The net under-ground biomass production was 633.46 g/m² in 2003, the ratio between the amount of increased under-ground biomass and the peak biomass output was 0.3193. Using data accumulated and analyzed for years in alpine meadows of northern Qinghai lake, a prediction model forecasting meteorological factors that influence the yearly vegetation biomass yield has been set up.

Key words: Kobresia humilis meadow, Biomass, Seasonal change, Meteorological factors, Prediction model

摘要： 测定高寒矮嵩草(Kobresia humilis)草甸地上、地下生物量季节动态,分析生物量季节动态与气候因子的相关性,建立了地上生物量动态变化的模拟模型。结果表明:高寒矮嵩草草甸地上生物量动态变化历经萌动期、返青期、旺盛生长期、稳定期和折损减少期等5个阶段;地下生物量自5-9月表现出升高-降低-升高的变化规律,且变化幅度较高;2003年地下净生产量633.46g/m²,周转率0.3193;利用海北高寒草甸多年观测资料,建立了气象因子影响植被年生产量的预报模型。

关键词: 矮嵩草草甸, 生物量, 季节动态, 气候因子, 预报模型