Aims Our objective was to explore differences in genetic diversity of Kobresia pygmaea populations related to grazing intensity to help prevent grassland degradation and contribute to ecology,genetics and evolutionary ecology.

Growth characteristics of Kobresia pygmaea clones in the "black soil beach" with different degradation;

Germplasm Resources Evaluation of Kobresia pygmaea in Tibet;

Study on seasonal variation in photosynthesis of Kobresia humilis population and community growth in alpine meadow demonstrated that maximum photosynthetic rate and apparent quantum yield exhibited increasing trend, namely, June>July>August>September.

Effects of over-grazing on vegetation degradation of the Kobresia pygmaea meadow and determination of degenerative index in the Naqu Prefecture of Tibet;

Effects of different treatments on structure of seeds vessel and germination percentage of 7 species of Kobresia seeds in Tibet;

Early Precambrian basement in the Dengfeng area,central Henan Province,is composed mainly of the Neoarchaean Dengfeng Group,Paleoproterozoic Songshan Group("group" is used in the sense of regional map divisions,and does not necessarily have stratigraphic meaning)and Neoarchaean granitoids.