Abstract: Zhangwu County is located in the southern margin of Horqin sandy land in northwestern Liaoning Province. The restoration and reconstruction of vegetation communities in this area is the research focus. In this paper, a 100 m×100 m monitoring plot was established in July 2014 in the open forest land in Aerxiang, Zhangwu County, Liaoning Province by using the large plot forest monitoring method. All woody and lianas individuals with diameter at breast height above 1 cm were investigated. The results showed that the number of species in this open forest land was less than that of the montane region of eastern Liaoning, totaling 10 species, belonging to 9 families 9 genera. The number of independent individuals was 393, and the number of individuals was 592 in the monitoring plot. Crataegus pinnatifida var. majo r and Populus × canadensis were dominant species according to importance value (0.316 and 0.295, respectively). Ulmus pumila and Pinus sylvestris var. mongolica occupied a certain proportion in this open forest land (with abundance of 47 and 26, respectively), and their regeneration was good. From the spatial distribution of species, the main tree species in forest except for P. sylvestris var. mongolica did not exhibit obvious aggregated distribution pattern; some small trees and shrubs or vines exhibited relatively aggregated distribution pattern, but did not exhibit a clear correlation with terrain.

Key words: north japonica, young ear formation period, low temperature treatment, shell rate, influence.