中文摘要：

采用公顷级样地调查,对浑善达克沙地天然沙地榆群落进行调查,以种群生命表及生存分析理论为基础,应用＂空间代替时间＂的方法编制白榆种群的静态生命表,绘制了沙地榆的存活曲线、生存率估计曲线和累计死亡率函数曲线,分析种群生命过程,研究了浑善达克沙地沙地榆种群动态和数量特征。结果表明：沙地榆种群在幼体向成树发育过程中存在两个死亡高峰,沙地榆存活曲线趋于Deevey-Ⅰ型,从整体上反映了沙地榆种群数量动态变化趋势,并坚定了沙地榆种群在群落中的优势地位。

英文摘要：

According to the life table of populations and the theory of survival analysis,using the survey data in Hunshandak sandland,we established a static life table of Ulmus pumila var.sabulosa populations and drawn the curves of survival rate,loss rate,mortality density function,accumulative mortality function,as well as risk rate function.Meanwhile,the life history of Ulmus pumila var.sabulosa population tends to be the type of Deevey-Ⅰ.Ulmus pumila var.sabulosa population dominated the community.