Species diversity and characteristics of a Dactylis glomerata community at different elevations in Tarbagatai Shan

For the protection and development of germplasm resources, the quantitative characteristics and species diversity of the Dactylis glomerata community in different elevation areas of a natural grassland were studied in the concentrated area of 1300-1900 m above sea level in Tarbagatai Shan, Xinjiang. The results showed that there was a difference in the number of characteristics in the Tarbagatai Shan; however, there was no regularity in the change. D. glomerata was always the dominant species in the community, and the importance values were more than 35%. When elevation was increased, the variation in α diversity decreased first and then increased, forming a V-shaped curve. The β diversity exhibited higher community similarity, and there were more common species, and the species diversity was negatively correlated with altitude, indicating that the species tended to decrease with altitude. The results of the study revealed a difference in the number and species diversity in the D. glomerata community at different elevations of Tarbagatai Shan area, and the effects of habitat conditions on species composition and diversity.