Abstract: Qilian Mountain is an important ecological security barrier in China. The study of different types of grassland vegetation can provide a reference for the rational utilization of grassland resources. In this study,we collected and analyzed the characteristics of different types of grassland vegetation communities in the eastern part of the Qilian Mountains,and evaluated the nutritional value of the grasses. The results showed that there were differences in vegetation and functional communities among different types of grasslands,among which,the Shannon-Wiener,Dominance index,and species richness index of alpine meadow was significantly higher than those of others. The aboveground biomass of alpine meadow and swamp meadow was significantly lower than that of steppe meadow and cultivated grassland,while the underground biomass was the opposite. The nutrient and carbon,nitrogen and phosphorus contents of herbage were different in different grassland types. The results showed that alpine meadow had better community stability and forage nutritional value,followed by the marsh meadow and steppe meadow.

Key words: Qilian Mountain, Grassland type, Vegetation community, Forage nutritional value

摘要： 祁连山是我国重要的生态屏障，对不同类型草地植被的研究可为草地资源的合理保护和利用提供参考。本研究采用样方法，采集并分析了祁连山东段4种不同类型的草地植被群落特征，并对牧草营养进行综合评定。结果表明：不同类型草地植被和功能群落存在差异，其中高寒草甸植被香农威纳、优势度和丰富度指数显著高于其他3类草地（P<0.05）；地上生物量表现为高寒草甸和沼泽化草甸显著低于草原化草甸和人工草地（P<0.05），地下生物量则相反。不同类型草地牧草营养和牧草碳、氮、磷含量存在不同程度的差异。综合比较不同草地类型植被群落特征，牧草碳、氮、磷含量以及牧草营养，发现高寒草甸的植被群落稳定性，牧草营养最优，沼泽化草甸次之，草原化草甸最差。

关键词: 祁连山, 草地类型, 植被群落, 牧草营养