To explore the response of annual plant Hyalea pulchella to precipitation change, H. pulchella was fed with 2 levels of stimulated rainfall, which were 30% and 50% more than the average precipitation, with no addition as the control. Analysis on phenological characteristics, vegetative growth and reproduction growth were recorded. Results showed that increased precipitation swifted flowering and fruiting stages of H.pulchella in advance by 2-4 d and 2-3 d, respectively. Plant heights, number of leaves and branches were higher in the groups with increased precipitation than the control, indicating that increased precipitation exerted significant impacts on life history characteristics of H.pulchella.%为了探讨一年草本琉苞菊对降水变化的响应机制，通过模拟降水增加试验，分析降水对琉苞菊的物候特征、营养生长和生殖生长过程的影响.结果表明：降水增加30％和50％使琉苞菊进入始花期和结实期的时间分别提前了2~4 d和2~3 d；随着降水量的增加，植株高度、分枝数和叶片数均表现为增加趋势( P<0.05)；降水增加也导致植株繁殖产量及生物量的增加( P<0.05).这表明降水增加对琉苞菊生活史特征的可塑性产生了显著影响.
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