中文摘要：

在沙沙丘理解土壤种子银行的特征是关键的稳定沙丘系统并且在沙漠维持植物人口。在这研究，我们在实验室在这块地和一个种子萌芽实验里进行了调查调查在 Gurbantunggut 沙漠在纵的沙沙丘的各种各样的似地球形状的位置探索土壤种子银行的特征，中国。完全，属于 17 个类的 17 植物种类和 9 个家庭在土壤种子银行，和属于 34 个类的 35 植物种类被识别， 17 个家庭被识别在未葬植被。在土壤种子银行的植物种类丰富与增加土壤深度减少了。最高的种类丰富在上面的斜坡被介绍上风斜坡和最低种类丰富在底被介绍上风斜坡。在土壤种子银行在之中的种子密度没有重要差别检验了七个似地球形状的位置。最高的种子密度发生在更低的斜坡当时，下风倾斜最低发生在冠。而且，种子密度与增加土壤深度减少了，在上面的土壤层(0-2 厘米) 是最高的。为两个土壤种子银行并且未葬植被，在在七个似地球形状的位置之中的 Simpsons 差异索引没有重要差别；然而， Shannon 牛肉熏香肠差异索引和 Pielous 平均在七个似地球形状的位置之中索引显示出的重要差别。尽管在在七个似地球形状的位置之中的土壤种子银行的种子密度没有重要差别，那些结果显示出那，似地球形状的位置显著地影响了土壤种子银行的种类丰富，差异和分发。因此，在沙沙丘的不同似地球形状的位置理解土壤种子银行的特征对植被恢复或重建必要。而且，在土壤之间的植物种类的 Jaccards 类似系数播种银行，建议植被恢复或重建过程应该通过把种子加到表面层被支持并且未葬在七个似地球形状的位置的植被是低的。

英文摘要：

Understanding the characteristics of soil seed banks in sand dunes is crucial to stabilize the dune systems and maintain the plant populations in deserts. In this study, we conducted a survey investigation in the field and a seed germination experiment in the laboratory to explore the characteristics of soil seed banks at various geomorphic positions of longitudinal sand dunes in the Gurbantunggut Desert, China. Totally, 17 plant species belonging to 17 genera and 9 families were identified in soil seed banks, and 35 plant species belonging to 34 genera and 17 families were identified in aboveground vegetation. Plant species richness in soil seed banks decreased with increasing soil depth. The highest species richness was presented in the upper slope of the windward slope and the lowest species richness was presented in the base of the windward slope. There was no significant difference in seed density of soil seed banks among the examined seven geomorphic positions. The highest seed density occurred in the lower slope of the leeward slope while the lowest occurred in the crest. Moreover, seed density decreased with increasing soil depth, being the highest in the upper soil layer （0-2 cm）. For both soil seed banks and aboveground vegetation, there was no significant difference in Simpson＇s diversity index among the seven geomorphic positions; however, Shannon-Wiener diversity index and Pielou＇s evenness index showed significant differences among the seven geomorphic positions. Those results showed that although there was no significant difference in seed density of soil seed banks among the seven geomorphic positions, the geomorphic positions significantly affected the species richness, diversity and distribution of soil seed banks. Therefore, understanding the characteristics of soil seed banks at different geomorphic positions of sand dunes is essential to vegetation restoration or reestablishment. Furthermore, the Jaccard＇s similarity coefficients of plant species between soil seed banks and abovegro