Abstract:

Haloxylon ammodendron, Reaumuria songarica, and Nitraria tangutorum are of great significance for wind prevention, sand fixation, and ecoenvironment improvement in Badain Jaran Desert. We explored their spatial distribution and interaction in Tamushu Wild Cistanche deserticolaand Haloxylon ammodendron Seed Production Base in Tamushu Town of Alxa Right Banner. Spatial distribution consistency, patch distribution characteristics, vegetation development direction and density effect of the three species were analyzed from the perspective of spatial distribution. The results showed that the consistency of spatial distribution of H. ammodendron, R. songarica and N. tangutorum decreased in proper order. The patch mosaic of spatial distribution was obvious among different species. The process of population invasion into the sandy land extended from southwest to northeast. Affected by the biological characteristics and resource constraints, the coordinate of runoff curve of average crown diameter was (700, 0), which was closely related to the dominance of H. ammodendronpopulation. There was competition among the three species within the 200 m scale and a synergistic effect in the whole research scale, with the trade off being based on the limitation of soil resources and the severity of the natural environment. In conclusion, there was a spatial mosaic distribution of the three species with smallscale competition and large-scale cooperation, due to their own biological characteristics and ecological adaptation characteristics. The vegetation diffusion pattern and development trend were dominated by H. ammodendron population.

Key words: Badain Jaran Desert, Haloxylon ammodendron, Reaumuria songarica, Nitraria tangutorum, spatial distribution.