关键词: 巴丹吉林沙漠, 主要种群, 数量特征, 空间分布

Abstract:

The Badain Jaran Desert is the third largest desert in China， which typical desert vegetation is a shrub and semi-shrub dominated vegetation type formed under extreme continental arid climate， and its tolerance to harsh environments and ecological adaptation process have formed unique phenotypic plasticity and ecological response strategies. In order to explore the adaptive basis and spatial distribution status of major populations， this study focused on the vegetation grown on the hard surface of sandy land on the eastern edge of the Badain Jaran Desert， using a two-factor experimental design of sample area and scale construction， combined with comparative and geostatistical analysis， the preliminary conclusions are as follows. Haloxylon ammodendron is resistant to barrenness and sandstorms， resulting in a high crown diameter and height performance. Nitraria tangutorum increases its own diameter of bunch by capturing flowing sand. Reaumuria songarica has strong seed germination and seedling planting ability， resulting in a higher frequency of occurrence. The status and role of the three species in the plant community decrease in order. The spatial distribution of N. tangutorum and H. ammodendron populations is mainly centered on the mother plant and spreads along the prevailing wind direction， while the spatial distribution of R.songarica populations is weakly concentrated even under the effect of structural factors. The overall spatial distribution of the three plant populations is mainly affected by structural factors， presenting a mosaic distribution pattern， and the boundaries between species disappear. In summary， the differences in the adaptation basis of H. ammodendron， N. tangutorum， and R. songarica populations to the environment can be reflected by quantitative characteristic indicators. Their status and role in the plant community decrease in order. The spatial distribution of a single population can reflect the diffusion pattern centered on the mother plant， and the spatial distribution of composite populations reflects the spatial coordination and adaptation situation， presenting a mosaic distribution pattern， and the boundaries between species disappear.

Key words: Badain Jaran Desert, main populations, quantitative characteristics, spatial distribution