【摘要】 牧草品质与物种多样性的相互关系既是草畜互作的重要基础，也是放牧稳定草原生态系统结构与功能的重要机制之一。本研究以祁连山甘肃马鹿(Cervus elaphus kansuensis)放牧的高寒典型草原为研究对象，分析群落物种多样性和功能组成与牧草品质的关系。结果表明：1) Pielou均匀度指数和莎草科生物量比例与粗蛋白产量正相关(P <0.01)，杂类草生物量比例与粗蛋白产量负相关(P <0.05)。2)物种丰富度、杂类草和不可食牧草生物量比例与牧草含水量正相关(P <0.001),Pielou均匀度指数和蔷薇科生物量比例与牧草含水量负相关(P <0.001)。3)莎草科和不可食牧草对粗蛋白产量和含水量的贡献率最大，分别为0.75和0.80。总之，物种多样性和功能组成是导致牧草品质变化的主要因素，草地管理应积极应对群落潜在的结构变化并制定相应的放牧管理对策，保障草地资源的高效利用。更多还原

【Abstract】 The relationship between forage quality and species diversity is an important basis for grass-livestock interactions.Additionally, it is also an important mechanism in grazing to stabilize the structure and function of grassland ecosystems. In this study, alpine typical grassland grazing by Cervus elaphus kansuensis in the Qilian Mountains was the research object,and the relationship among community species diversity, functional composition, and forage quality was analyzed. The results showed that: 1) the Pielou evenness index and biomass proportion of Cyperaceae were positively correlated with crude protein yield(P < 0.01), and the biomass proportion of forbs was negatively correlated with crude protein yield(P <0.05). 2) the species richness and biomass proportion of forbs and inedible forages were positively correlated with forage water content(P < 0.001) and the Pielou evenness index and biomass proportion of Rosaceae were negatively correlated with forage water content(P < 0.001). 3) the biomass proportion of Cyperaceae and inedible forages contributed the most to crude protein yield and water content, which were 0.75 and 0.80, respectively. In summary, species diversity and functional composition are the main factors contributing to changes in forage quality. Grassland management should involve actively responding to potential changes in community structure and formulation of corresponding grazing management strategies to ensure efficient use of grassland resources.更多还原