光照和沙埋对沙生针茅种子萌发与幼苗出土的影响

为了对沙生针茅种子萌发特征和休眠机理的研究,采用种子萌发学和实验生态学方法,研究了不同光照、划破种（果）皮及切除不同比例胚乳对种子萌发的影响和模拟野外条件对不同沙埋深度幼苗出土的影响。结果表明：黑暗条件下种子萌发率显著高于光条件下;移走胚乳75%时,种子萌发最快;不同沙埋深度以0.5 cm的浅层沙埋时的种子萌发率和幼苗出土率最高而休眠率最低;沙埋超过2 cm后,种子萌发率、幼苗出土率与沙埋深度呈负相关,休眠率随着沙埋深度的增加而增加。说明沙生针茅种子为休眠型暗条件萌发类型。人工播种应以0.5~2 cm深度为宜。

Effects of Light and Sand Burial on the Seed Germination and Seedling Emergence of stipa glareosa

In order to studyStipa glareosa seed germination characteristics and mechanism of dormancy, seed germination and experiment ecological methods was used to study the effects of different light, cut through the kind of and removal of different proportions of skin (fruit) onStipa glareosa endosperm germination and analog field conditions different burial depths seedling emergence. The results showed that:Stipa glareosa germination rate under dark conditions was significantly higher than light conditions; removal of 75% of the endosperm, Stipa glareosa germination was the fastest; different burial depth when buried of 0.5 cm in shallow sand seed germination andStipa glareosa was the highest rate of seedling emergence but dormancy rate was the lowest; sand burial depth of more than 2 cm after,Stipa glareosa seed germination, seedling emergence rate and sand burial depth was negatively correlated with sand burial depth dormancy rate increases.Stipa glareosa seed was the germination type latent dark conditions. Artificial seedingStipa glareosa seeds should be 0.5-2 cm depth is appropriate.