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中文摘要：
以青藏高原东缘九种紫草科植物为对象，在100％自然全光照以及36％NS和3％NS的光照强度下，对其种子萌发特征进行了研究．选取了萌发率、萌发指数和平均萌发时间三个萌发参数，并且依据种子萌发对光响应的不同将本实验所研究的九种紫草科植物分为以下四类：1）对光照梯度无响应，即不同光照强度下GP，GI和MGT都无显著变化的有狼紫草、西藏附地菜、小花琉璃草、甘青微孔草和微孔草；2）光照减小了GP和GI，延长了MGT的有倒提壶与卵盘鹤虱；3）光照梯度对GP和GI都无影响，而延长了MGT的有小叶滇紫草；4）光照提高了GP和GI而对MGT无影响的有糙草．此九种紫草科植物可能存在两种萌发对策，即感应水分和感应光照，来选择萌发时间和萌发数量，从而在萌发行为上产生了生态位分化．
英文摘要：
Seed germination characteristics of nine Boraginaceae species on the eastern Qinghai-Tibet plateau were investigated sunder three different light gradients（100% natural sunlight（NS）, 36% NS, 3% NS）. Germination percentage （GP）, germination index （GI） and mean germination time （MGT） were chosen as germination parameters and, according to the germination response to light, these nine Boraginaceae species were classified as follows： 1） Under different light, GP, MGT and GI showed no significant difference in Lycopsis orientalis, Trigonotis tibetica, Cynoglossum lanceolatum, Microula pseudotrichocarpa, Microula sikkimensis; 2） Light decreased both GP and GI of Cynoglossum amabile and Lappula redowskii while increasing MGT; 3） Light had no influence on GP and GI of Onosma sinicum while increasing MGT; 4） Light increased both GP and GI of Asperugo procumbens while MGT had no significant difference. We think that there may be two germination strategies （responding to water or light） existing in these nine Boraginaceae species and, by these two approaches, they can choose germination time and germination quantities and make niche differences in germination behavior.
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