沙埋对几种沙生植物种子萌发和幼苗的影响

Effect of sand-burying on seed germination and seedling of several psammophytes species

研究了沙埋对科尔沁沙地7种植物的种子萌发和幼苗存活的影响.9个沙埋处理深度为1、2、3、45、、6、7、8和10 cm.结果表明,在不同沙埋处理下,7种植物的萌发率存在显著差异,除山竹岩黄芪外,其他6种植物的萌发趋势均随着沙埋深度的增加而下降,山竹岩黄芪在不同沙埋处理下均有较高的萌发率,在8 cm埋深处萌发率最小.沙埋对7种植物的幼苗出土均有显著影响,埋深增加,出苗率减小,幼苗出土与植物繁殖体的大小有关,繁殖体大的物种具有较深沙层的幼苗出土,幼苗出土的沙埋深度顺序为小叶锦鸡儿≥沙米>山竹岩黄芪≥大果虫实>地肤≥灰绿藜>差巴嘎蒿.

The impacts of sand - burying on seed germination and seedling of seven psammophytes in Hoeqin Sandy Land were studied. Designed nine sand - burying depths of i, 2, 3, 4, 5, 6, 7, 8 and 10 cm in the experiments. The results showed that there were significant relationships among the seed germination of seven plants in different treatments of sand - burying. Except Hedysarumfruticosum, the germination rates of the other six plants decreased with the increasing burial depth, and Hedysarum fruticosum had the higher germination rate in different depths, which reached the least in 8cm depth. Sand- burying significantly affected the seedling emergence of all plants. The emergence rate decreased with the increasing burial depth. The plants with lager seeds emerged from deeper depth, and the maximum burial depth of seedling emergence was Caragana microphylla ≥ Agriophyllum squarrosum 〉 Hedysarum fruticosum ≥ Corispermum macrocarpum 〉 Kochia scoparia ≥ Chenopodium glaucum 〉 Artemisia halodendron.