Abstract:

Based on the measurement of crown, height and density of Lycium ruthenicum population in different habitats in Hexi corridor, this paper analyzed the growth difference and the distribution pattern of L. ruthenicum population. The results show that: (1) the density, height and crown of L. ruthenicum population are different among the habitats, the more serious salinization degree, the more single the species, the density of L. ruthenicum population is greater; except the population of L. ruthenicum in Majiajing of Minqin County, there is no significant difference in height and crown among other groups (P>0.05); (2) the age structure of L. ruthenicum population on the semi-fixed sand dune is the declining type, and the rest is the stable type, affected by the arid climate and salinization, the regeneration of L. ruthenicum population is slow, and the number of seedlings is very limited, which is adverse to the stable development of the population; (3) all the 8 habitat types of L. ruthenicum show an aggregation distribution, the aggregation intensity varies with the habitats; the order of aggregation intensity is: semi-fixed sand dune in Majiajing, Minqin County> severe saline alkali land in the south of Guazhou County, Jiuquan City> saline alkali land in the lacustrine sediments of Baitujing, Minqin County> moderate saline alkali land in Shuisheng village of Minqin County >severe saline alkali land in Fengzheng village of Minqin County> sand covered moderate saline alkali land in Shanglijia village of Minqin County> light saline alkali land of reclamation in Huanghui village of Minqin County> the land covered with sand dunes in Xinghe village of Minqin County.

Key words: Hexi corridor, habitats, Lycium ruthenicum, population distribution pattern, age structure