The spatial heterogeneity of ecology lies in its ubiquity as a feature of ecosystem. It has drawn more attentions in the research of ecosystem processes in recent years. The arid mountainous regions of northwest parts of China are considered as the sensitive ecological zones to affect environment of China. However, the ecosystem functions of those areas have been adversely affected by some reasonless activities of mankind, such as overgrazing, mining and digging up the roots of herbs etc. Therefore, a bette...