Cluster analysis of the Haloxylon ammodendron communities in Junnger Basin Effects of climate change on Haloxylon ammodendron community in southern edge of Zhunger Basin Multi-scale biomass estimation of desert shrubs: a case study of Haloxylon ammodendron in the Gurbantunggut Desert, China Haloxylon ammodendron community patterns in different habitats along southeastern edge of Zhunger Basin