Abstract:

In order to reveal the growth habits and spatial pattern distribution mechanism of Salsola passerina population in the Alashan Plateau， Method of dividing age class by volume and Ripley's K function were used to study the population structure， spatial distribution pattern and spatial correlation of representative S. passerina population. The results showed that the population of S. passerina was dominated by stable population， followed by expanding population. There are many adult individuals， and the overall population tends to be stable； As the degree of drought increases， the spatial distribution pattern of S. passerina population and age class changes from complex to single form， that is， from aggregation distribution or uniform distribution to random distribution. In populations with more precipitation， the spatial correlations between age classes are relatively complex. with the increase of scale， it changes from positive association to no correlation， and then to negative correlation. In the more arid regions， there is generally no correlation. In summary， In the Alashan Plateau， the spatial distribution of the S. passerina population is influenced by its biological characteristics and environmental factors. In the ecological construction， the mutual relationship between populations and habitats should be followed to give play to its value for feed and sand fixation.

Key words: Alashan Plateau, Salsola passerina, spatial distribution pattern, spatial correlation, point pattern analysis