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中文摘要：
以青藏高原东缘15种藜科和蓼科植物种子为对象，在100％全自然光照和3％自然光强的人工遮荫条件下统计了植物种子的萌发率和相对光萌发率，分析了此15种植物种子在两种光照水平下的萌发率差异以及相对光萌发率与种子大小的关系。结果显示，各物种种子萌发对光照的响应没有一致性的规律，但相关分析结果表明，1）整体上，随着种子大小的增加，萌发对光照的依赖性逐渐降低（P〈0．05）；2）不同生活型植物种子萌发对光照的依赖程度不同，即一年生植物种子萌发对光照敏感且随着种子大小的增加萌发对光的依赖性降低（P〈0．001），而多年生植物种子萌发不依赖于光照（P〉0．05）。证明种子大小和生活型共同影响着种子萌发对光照的响应。
英文摘要：
Under different light gradients [100% and 3% natural sunlight （NS）], both seed germinationpercentage （GP） and relative light germination rate （RI.G） of 15 Chenopodiaceae and Polygonaceae species of the eastern edge of Qinghai-Tibet Plateau were measured in this study. Differences on germination of these species under two light levels were also analyzed by paired samples T test. The relationship between seed size and RLG was investigated by Pearson analysis. The T test displayed that germination response to lights was different in all of the species, while the Pearson analysis showed that germination became less dependent on lights with increasing seed mass. We also found that there were differences on germination bewteen annual and perennial species. The germination of annual species needed light, but became less dependent with increasing seed mass （P~0. 001）; while the germination of perennial species did not depend on the lights （P）0.05）. The study demonstrated that germination responses to lights of the 15 Chenopodiaceae and Polygonaceae species were affected by both seed size and life form.
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