On the basis of the theory of modularity, the correlation between environmental factors and the modular structure of the Reaumuria soongorica population in the desert of Fukang, Xinjiang, was studied through analysis of the degree of relatedness adopted in the grey system theory.

Reproductive characteristics of two Reaumuria soongorica populations was investigated at Alashan Region, Inner Mongolia.

Reaumuria soongorica community of desert grassland in Minqin were investigated by line transect method.

The T-square study of Betula albo-sinensis population on the west slope of Jiuding Mountain showed that the population was mainly in random distribution, and in aggregated distribution in a few lines because of the negative human activities and severe destructions.

The accumulating amounts of nutrient element in Trifolium pratense population in different utilization periods;

The dynamic characteristics of photosynthetic organs of Trifolium pratense populations;

The Dynamic of Biotic Accumulative Rate in Trifolium pratense population;