草原资源是藏族牧民赖以生存的物质基础。生态承载力能够反映草原系统的健康状况。本文以那曲9个纯牧业县区为研究对象，选取与草地生态承载力相关的12个指标，运用主成分分析进行指标精简和综合评价。结果表明，尼玛县和双湖县草地生态承载力最强，申扎县、安多县和班戈县承载力次之，巴青县和嘉黎县承载力较弱，色尼区承载力最弱。草地生态承载力受人类活动和自然因素共同作用，而人类活动是影响草地生态承载力的重要因素。

Grassland resources are the material basis for Tibetan herdsmen to survive. Ecological carrying capacity can reflect the health status of grassland system. In this study， 12 indexes related to grassland ecological carrying capacity， in 9 pure pastoral counties in Naqu， were selected， and these indexes were simplified and comprehensively evaluated by principal component analysis. The results showed that the grassland ecological carrying capacity was the strongest in Nima county and Shuanghu county， followed by Shenzha county， Anduo county and Bangor county. However， the grassland ecological carrying capacity in Baqing county and Jiali county were weak， and Seni district was weakest. Grassland ecological carrying capacity is affected by human activities and natural factors， and human activities are important factors affecting grassland ecological carrying capacity.

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西藏自治区自然科学基金(XZ202001ZR0086G)。