Abstract: In order to study the spatial distribution of Tamushu natural sacsaoul (Haloxylon ammodendron (C. A. Meyer) Bunge) forest and its relationship with topographic undulation change (GPS altitude point), Tamushu wild Cistanche and H. ammodendron seed production base in Tamushu region at the eastern edge of the Badain Jaran Desert was chosen as test area and its H. ammodendron forest as study object. Line transect was used to survey plant height and crown diameter of H. ammodendron and H. ammodendron density was counted in combination with GPS points. Various analysis methods were then used to explore the relationship of spatial distribution of natural H. ammodendron forest with topographic undulations. It was found that quantitative features of H. ammodendron forest had highly significant correlation (P <0.01) with topographic undulation, and both were affected by structural factors within the autocorrelation scale, in which the spatial autocorrelation was to a high degree and spatial distribution pattern was simple. Furthermore, the complexities of density, height, crown diameter of H. ammodendron forest and topographic undulation decreased successively. The results also showed that H. ammodendron invaded the sand dune from its southern side and spread rapidly due to prevailing winds in this region. Hence, the dunes moved forward slowly, functioning as wind prevention and sand fixation. The results of this study provide a scientific reference for establishment of seed production base.

Key words: Abies faxoniana, non-structural carbohydrate, simulated warming, functional group removal