The relationship between biodiversity and ecosystem functioning has become a central issue in the fields of climate change and biodiversity conservation. The Qinghai-Tibet Plateau represents a globally typical ecologically fragile region， and with the intensification of global climate change， the structure and functioning of alpine meadow ecosystems are undergoing significant alterations. In this study， open-top chamber warming experiments were conducted to comprehensively assess plant species diversity and multiple ecosystem functions. Ecosystem multifunctionality was quantified using the averaging method to explore the relationships among simulated warming， species diversity， ecosystem functions， and multifunctionality. The results showed that warming suppressed the accumulation of aboveground and belowground biomass， while Margalef index， Simpson index， and Shannon-Weiner index decreased significantly （P<0.05）. Redundancy analysis indicated that ecosystem multifunctionality was significantly positively correlated with Margalef index， Shannon-Weiner index， and Simpson index （P<0.05）， with improvements in these indices accompanying enhancements in ecosystem functioning. Among these， species richness appeared to be a more critical influencing factor compared with species evenness and dominance. This study provides an important theoretical reference for understanding the responses and adaptive mechanisms of alpine meadow ecosystems under global climate change on the Qinghai-Tibet Plateau.

Tibetan Plateau  /  Gradient warming  /  Species diversity  /  Mean method  /  Ecosystem multifunctionality