基于生态系统服务和生态系统健康的生态风险评价——以长株潭城市群为例

基于生态系统服务和生态系统健康的生态风险评估框架为城市群生态风险管理和国土生态修复提供新的视角。以生态风险评估框架为基础,综合运用生态系统服务、生态系统健康评估模型以及相关分析法对长株潭城市群展开生态风险评价,并对风险程度进行分类。结果表明:(1)城市群的城市化水平提升,区域生态风险也随之增加。生态系统服务价值、生态系统组织、生态系统活力、生态系统弹性等生态指数呈现下降趋势。(2)人工表面比率和生态指数之间的Pearson相关系数表明,人工表面比率与生态指数之间存在负相关关系,人工表面比率是生态风险提升的关键因素。(3)城市群人工表面比率要控制在36%以下,以进行生态风险管理和国土生态修复。总的来说,评价框架可以作为区域生态风险的评价终点。

Incorporating ecosystem services with ecosystem health for ecological risk assessment: case study in Changsha-Zhuzhou-Xiangtan urban agglomeration, China

Based on the ecological risk assessment framework, this study utilized the ecological equivalent method, the ecological health assessment model, and the related analysis method to implement ecological risk assessment for the Changsha-Zhuzhou-Xiangtan (Changzhutan) urban agglomeration and classify the levels of risk. The results showed that (1) With the urbanization of urban agglomerations on the upgrade, the regionally ecological risks rose simultaneously. Ecosystem indexes including ecosystem service value, ecosystem organization, ecosystem vitality, and ecosystem resilience have demonstrated a downward trend. (2) The Pearson correlation coefficient between the artificial surface ratio and the ecological index indicated that there was a negative correlation between them, and the artificial surface ratio was a key factor responsible for ecological risk increase. (3) The artificial surface ratio of urban agglomeration should be controlled below 36% for better ecological risk management and land ecological restoration. To sum up, the evaluation framework can serve as the evaluation endpoint for regional ecological risks.