中文摘要：

差巴嘎蒿是科尔沁沙地流动、半流动沙丘的主要物种之一．本试验设置室内自然条件培养、培养箱中恒温全光（24h光照）培养、恒温光暗交替（12h光照）培养和恒温全暗（0h光照）培养4种处理，研究不同温度和光照对差巴嘎蒿种子萌发及幼苗生长的影响．结果表明：室内自然光照和温度条件下差巴嘎蒿种子的萌发率（66．6％）和萌发指数（19．1％）均明显低于恒温箱培养，恒温箱的3个处理中，全暗条件下的种子发芽率（70．2％）低于全光（73．4％）和光暗交替（73．4％）培养，但差异不显著，全光条件下的萌发指数为28．2％，显著低于全暗（31．4％）和光暗交替（30．8％）培养；光照条件对幼苗生长的影响明显，在种子萌发过程中，胚根的生长出现全光促进、全暗抑制的现象，胚芽长度为全暗（2．81cm）和光暗交替（1．51cm）条件下高于全光（1．21cm）培养和实验室自然条件（1．27cm）培养．环境温度可能是限制差巴嘎蒿种子萌发的主要因素，而光照是影响差巴嘎蒿幼苗生长发育的重要因子．

英文摘要：

Artemisia halodendron is a dominant species in mobile and semi-mobile dunes of Horqin Sand Land. To investigate the germination character and seedling growth under different temperature and light conditions, the germination rate, germination index and growth of radicle and plumule were measured after treatments in laboratory and heating cabinet incubations. In the laboratory the light and temperature were near to nature condition, while in the heating cabinet it was kept at 25 ℃ with varying durations of light supply, including 24-, 12- and 0-hour light per day. Germina- tion rate （66.6%） and germination index （19.1%） under laboratory condition were both signifi- cantly lower than in the heating cabinet （P〈0.05）. In the heating cabinet, the germination rate under 0-hour light was 70.2%, which was insignificantly lower （ P〉0.05 ） than under 12- and 24- hour light conditions （ both 73.4% ）, and the germination index under 24-hour light was 28.2%, which was significantly （P〈0.05） lower than under 0- and 12-hour light conditions （31.3% and 30.8%, respectively）. Radicle and plumule growth responded to light more readily than the seed germination rate and germination index during the process of germination, and the radicle growth was inhibited by darkness while promoted by light, and the plumule lengths under 0- and 12-hour light conditions were 2.81 cm and 1.51 cm, respectively, significantly higher than under 24-hour light （1.21 cm） and natural condition （1.27 cm）. It was concluded that temperature was a main factor in seed germination, and seedling growth was mainly influenced by light regime.