Qinghai’s special ecological status,with Qilian Mountains, Qaidam Basin, Huangshui Basin, is related to national political stability and social development.

This paper discusses those shrub forests peculiar biological functions and ecological status and puts forward the countermeasures for protecting the shrub forests in Qinghai Province.

The concept of geographical niche was introduced in this paper It represents the geographical distribution scale and population size of species Geographical niche breadth and overlap index were measured for the mosquitoes of 19 sites (in 16 provinces) in China,and the overlap groups were classified for the 9 species of mosquitoes by the systematic clustering and principal components analysis (PCA

This paper proposes the concepts of cultivated land ecounit and cultivated land niche,then expounds its chatacter and development law based on niche theory.