中文摘要：

退化草地生态系统中物种多样性的严重丧失及其后果,至今仍缺乏有代表性的实验结论.放牧是人类施加于草原生态系统最主要的干扰因素,从荒漠草原群落多样性、植物功能群多样性以及物种多样性与生产力的关系3个方面综述相关研究进展.提出不同放牧制度对荒漠草原群落多样性、植物功能群多样性的影响过程和作用机制是研究荒漠草原利用与保护平衡的关键.

英文摘要：

The potential ecological consequences of biodiversity loss of degraded grasslands have aroused considerable interest.At present there are poorly representative results obtained in ex-periments.Grazing is the main contribution of human impacts on the steppe ecosystem.This paper reviewed the advances of studies on species diversity,plant functional-group diversity and the rela-tionship between species diversity and primary productivity based on the available literature.This review shows that some crucial questions about the effects and mechanism of grazing system on the communities diversity and functional-group diversity should be involved in the further study on gra-zing management of steppe.