Understanding how ecosystem vulnerability in response to climate change is generated and distributed is animportant topic; however,quantitative assessments of the vulnerability process remain relatively rare.The Intergovernmental Panel on Climate Change(IPCC) regards ecosystem vulnerability as sensitivity or susceptibility to harm, lacking the capacity to cope and adapt.Through analysis of the concept of vulnerability,we propose a response-based quantitative method to assess ecosystem vulnerability, integrating the concepts of sensitivity and adaptability. This method was applied to assess ecosystem vulnerability in China from 1981 to 2050.The results indicated that vulnerability would develop in nearly 30% of the terrestrial ecosystems of China. Vulnerability would be severe in the grassland and desert ecosystems, distributed mainly in the Tianshan Mountain and the Inner Mongolia Plateau. As the effects of sensitivity and adaptability to temperature and precipitation differ, obvious regional differences exist between the ecosystem vulnerability zones in China.For example,the effects of climate warming would be severe in the north west of the Loess Plateau,with the vulnerability caused mainly by high sensitivity to warming. However,the vulnerability in the south eastern part would be caused mainly by low adaptability to increasing precipitation. Compared with previous research, our method emphasizes the critical role of adaptability, which enhances the scientificity and reasonableness of assessing ecosystem vulnerability, and enriches the methodology adopted under the IPCC framework. However, as we did not consider fully the autonomous adaptation mechanism in ecosystem vulnerability,this aspect should be combined with other factors infuturestudy.
