中文摘要：

根据青藏高原东部植物生长的气候条件及种子萌发的自然环境．设置24h无光照、12h5℃／12h25℃变温条件，通过人工气候室内萌发试验．研究了该地40种常见一年生植物的萌发特性。结果表明，高寒草甸一年生植物萌发开始时间都比较早．萌发速率相对比较高，而萌发率和萌发指数变化幅度相对比较大。根据萌发率高低分为4种类型：高萌型（萌发率〉80％）．中间型（55％～80％），次低萌型（30％～55％）．低萌型（萌发率〈30％）。试验结果还表明高萌型的物种萌发比较整齐连续．萌发高峰期出现在第2～4天，萌发持续时间比较短，萌发速度比较快，萌发过程多表现为单峰曲线．即一次全部下注。中间型的种萌发不连续，萌发启动相对较晚，萌发过程多表现为多峰曲线。本试验中低萌型的种有17种．萌发更加不连续，萌发持续时间相对比较长，萌发更加缓慢，其萌发对策更加趋向于多次下注。

英文摘要：

Annual plants grow fast and can speedily revegetate areas. Germination characteristics of 40 kinds of eastern Qinghai-Tibetan plateau annual plants were studied in plant growth chamber experiments in the dark and under 12 h 5℃/12 h 25℃ temperature cycling. Annual alpine meadow plants usually germinate quickly and their germination speeds are comparatively high. Cluster analysis of their germination ratios showed, there were four clusters, high germinating species （germination ratio〉80 %）, intremediate germinating species （germination ratio 55%- 80 %）, low germinating species （germination ratio 30 % - 55 %）, lowest germination species （germination ratio lower than 30%）. Seeds of high germinating species germinated more orderly and in sequence than low germinating species. Maximum germination was in 2-4 days after planting and germination showed a single-apex curve, which is more accordant to once betting. Intermediate seeds germinate discontinuously and comparatively with a multi-apex germination curve. There were 17 kinds of low germination seeds （germination ratio〈30%） in the experiments. These seeds germinated even more discontinuously and their germination characteristics were in accord with Bet-hedging.