The feature of the zhaochigou group complex in the middle of the Helan Mountains in palaeoproterozoic

Winter Habitat Selection of Alectoris chukar potanini in Helan Mountains,China;

Distribution and Abundance of Blue Sheep in Helan Mountains,China;

The Morphology of Main Plant Species in the Woodlands of the Helan Mountains;

Comparison between agricultural Land on alluvial fans at Qilian Mountain,Helan Mountain and Lüliang Mountain regions;

Comparison of Seasonal Feeding Habitats by Blue Sheep (Pseudois nayaur) During Winter and Spring in Helan Mountain, China;

Research on the Plant Communities Spatial Heterogeneity of the Helan Mountain;

The Maowusu Desert lies to the east of the Helan mountain and the other lies to the west of it.

By measuring the ring width of Pinus tabulacformis, analyzing the relation between the width and climatic factors, precipitation was reconstructed in the area of the Helan Mountain(38°31′N,105°46′E), which is located in the west environmental sensitive zone in north China, or in the transition from arid to semiarid regions (monsoon to nonmonsoon).