中文摘要：

采用空间格局分析方法,对毛乌素沙地不同立地条件下油蒿种群的生存-死亡,开花-未开花状态的空间格局分布特征进行分析。结果表明：1半固定沙地油蒿种群存活状态明显优于固定沙地。半固定沙地油蒿种群状态稳定,其存活、死亡油蒿均表现为均匀或随机分布,两者之间不存在竞争关系;固定沙地死亡油蒿较多,且油蒿主要呈现高度聚集分布,存活油蒿和死亡油蒿两者之间表现为高度竞争关系;2半固定沙地油蒿种群开花状态要好于固定沙地,其开花油蒿表现为均匀或随机分布,开花与未开花油蒿两者之间呈现高度正相关,互相促进的关系;而固定沙地开花油蒿表现为高度聚集分布的状态,开花与未开花油蒿种群呈现高度负相关,两者之间表现为互相竞争的关系。

英文摘要：

In this study,the spatial interaction of survival and flowering Artemisia ordosica populations at the fixed and semi-fixed sites in the Mu Us Sandland was analyzed using the spatial point pattern analysis method. The results showed that the survival status of A. ordosica at the semi-fixed site was significantly better than that at the fixed site.The A. ordosica population was stable at the semi-fixed site with a uniform or random distribution,and there was no competition between them; while at the fixed site,more died A. ordosica individuals existed,the population was in a highly aggregated distribution,and there was highly competitive relationship between the survival and died individuals. The flowering status of A. ordosica individuals at the semi-fixed site was also better than that at the fixed site.The flowering ones were in a uniform or random distribution,and there was a highly facilitating relationship between the flowering and non-flowering ones at the semi-fixed site; while at the fixed site,flowering A. ordosica individuals were highly aggregated,and there was a highly competing relationship between flowering and non-flowering ones.