浅析江河源区生态系统脆弱性研究的科学问题

Scientific Issues of Ecosystem Vulnerability Research in the Source Regions of Yangtze and Yellow Rivers

长江、黄河源区位于青藏高原腹地,是我国气候变化的敏感区和脆弱区,面对全球气候变化以及我国冰冻圈萎缩的压力,明晰基于冰冻圈变化条件下江河源区生态系统脆弱性的科学问题,是长江、黄河流域生态安全保障及社会经济持续发展的客观要求。在分析江河源区范围、江河源区和我国冰冻圈的关系、目前生态系统脆弱性研究的基本特点的基础上,在全球气候变化和冰冻圈变化的复杂背景下,提出并阐述了江河源区生态系统脆弱性研究的5个重要科学问题:(1)脆弱性概念的延伸和拓展;(2)气候系统的非线性作用;(3)脆弱性评价的时空尺度;(4)脆弱性评价的临界阈值;(5)脆弱性评价的界面链接等。

The source regions of Yangtze and Yellow Rivers as the part of Qinghai-Tibetan Plateau, it is the region of sensibility and vulnerability of climate change. And vulnerability of ecosystem has become a key issue both in assessing the impact of climate change and in setting up the adaptation strategies on climate change. Global environmental change and sustainability science increasingly recognize the need to address the consequences of changes taking place in the structure and function of the special ecosystem such as the source region of Yangtze and Yellow Rivers. Therefore, analysis on scientific issues of ecosystem vulnerability should improve significantly our understanding of the structure and function of ecosystem and the human impress on both based on climate change, especially in cryospheric change. This paper elucidates five scientific issues of ecosystem vulnerability assessment： the extension of vulnerability concept ; non-linear reaction on ecosystem of climate system ; spatial-temporal scale transformation of vulnerability assessment; ecosystem threshold of vulnerability assessment; and linking among different interfaces in vulnerability assessment.