中文摘要：

生态脆弱性已成为当前全球变化与可持续发展研究的热点问题。南方丘陵区是典型的生态脆弱区,因此,首先,本文给出了农业生态环境脆弱性的概念,并分析了其脆弱性的内涵。然后,以衡阳盆地为例构建南方丘陵区农业生态环境脆弱性的评价指标体系,包括自然、社会、经济因素3个方面13个具体指标,以县域为评价单元,采用主成分分析法进行研究。最后,在主成分分析基础上,分析了南方丘陵区农业生态环境脆弱性的驱动力。结果表明：研究区脆弱性有4大驱动力,自然环境背景和经济发展状况是首要驱动力,农民生活水平和农业水利设施状况次之;从驱动力类型来看,胁迫型脆弱性驱动力为主要驱动力,结构型脆弱性驱动力为次要驱动力,落后的社会、经济生产方式是农业生态环境脆弱性的强大驱动力。

英文摘要：

Ecological vulnerability has become a hot issue of the research on the global change and sustainable development.The hilly area of southern China is a typical ecologically fragile area.The paper takes Hengyang Basin as an example,and adopts principal component analysis to study the driving forces of the agricultural eco-environmental vulnerability.First,we define the concept of the agricultural ecology vulnerability（AEV）,and analyze the contents of the AEV.Then,based on the characteristics of agricultural eco-environment,we es-tablish the AEV indexes for the Hengyang Basin in the southern China hilly areas,which include natural factors,social factors and economic factors,and take county as the evaluation unit.Principal component analysis is an important method in multivariate statistical analysis.Hence,we adopt this method to study the driving forces of the AEV in this paper,and explore the mechanism that causes the vulnerability.The results show that there are four principal driving forces affecting the vulnerability of agricultural eco-environment of this area.The natural environment and economic development background are the primary driving forces,and living standards and agricultural water facilities are the secondary forces.From the view of driving force type,the stress-type driving force is dominant,and the structure-type driving force is minor.Backward mode of production is a powerful driving force of the AEV.