中文摘要：

倒披针叶虫实（Corispermum lehmannianum）在古尔班通古特沙漠广泛分布,重要值仅次于该沙漠建群种白梭梭（Haloxylon persicum）,对沙面的稳定起着非常重要的作用。采用固定样方法对自然条件下该植物的分布特征和种群数量动态进行了研究。结果表明：1）倒披针叶虫实在沙丘各坡位均占有较高重要值,尤其活化程度较高的中部和上部优势度更明显;2）生长季节的不同阶段,除坡顶外,其他各坡位种子主要分3批萌发出苗,不同时期种子萌发出苗数量存在差异,3月份有大量种子萌发出苗,4月份种子萌发出苗数最多,5月份萌发出苗量逐渐减少。而坡顶3月份种子萌发出苗量最多,4月至5月均无种子萌发出苗。因此,除坡顶外,种子萌发出苗数量和种群密度在其他各坡位呈先增后减的趋势。生长季结束时各坡位种群密度表现为：中部和上部〉底部和丘间〉顶部;3）成熟植株单位面积种子产量为：中部和上部〉丘间和底部〉顶部,且中部和上部单位面积种子数量极显著多于丘间、坡底和坡顶（P〈0.01）;4）通过对0—5 cm和6—10 cm土壤种子库密度研究发现,沙丘中部和上部种子库密度显著高于其他坡位。综合以上研究表明,倒披针叶虫实在沙面较活化的中部和上部呈优势分布,对沙漠环境具有良好适应性。因此,该植物是一种极具开发潜力的沙生植物。

英文摘要：

Corispermum lehmannianum, which ranks only second to Haloxylon persicum in terms of Importance Value, is a valuable component of the desert flora. It is widely distributed in the Gurbantunggut Desert and plays a very important role in the stabilization of sand dunes. Consequently, this study investigated the distribution characteristics and dynamics of the population of C. lehmannianum under natural conditions, adopting the method of fixed quadrant. The results showed the following ： 1 ） C. lehmannianum has a higher Importance Value on all slope positions of the dunes, especially in the middle and upper parts of sand dunes where sand is more unstable compared with other slope positions. 2） Throughout the entire growth season, germination rate and emergence of seedlings on each slope position, aside from the top of the dunes, differentiates three groups. Different levels of seed germination are observed in different periods; a large number of seeds germinate and a large number of seedlings emerge in March. The highest levels of seed germination and emergence of seedlings occur in April, graduall the highest in March, whereas no y decreasing in May. However, on the top of sand dunes, germination and emergence are germination and emergence were observed from April to May. Therefore, seed germination and population density on other slope positions, except at the top of sand dunes, increase, and then decrease. At the end of the growth season, population density demonstrates the following tendency in variation： the middle and upper parts of sand dunes 〉 the lower part of sand dunes and interdunes 〉 the top of sand dunes. 3） The seed yield per unit area of mature plants shows the same tendency as the population density. Seed number per unit area in the middle and upper parts of sand dunes are significantly higher than those in the interdunes, the bottom of the sand dunes, and the top of the sand dunes （P〈0.01）. 4） Given the seed bank densities at depths of 0--5 em and 6--10 cm, the experimental res