基于生态安全格局的资源枯竭型城市生态保护修复关键区识别:以徐州市贾汪区为例

    Identifying of key areas for ecosystem protection and restoration for resource-exhausted cities based on ecological security pattern: a case study of Jiawang District, Xuzhou City

    • 摘要: 科学构建生态安全格局、识别生态保护修复关键区是系统推进生态修复目标,实现资源枯竭型城市绿色转型发展和生态安全的基本保障与重要途径。本文以东部典型资源枯竭型城市徐州市贾汪区为例,通过定量评估土壤保持、碳存储、生境质量、产水量和固碳释氧五种生态系统服务功能变化,分析了绿色转型中的贾汪区生态修复治理成效。在此基础上,基于热点分析、最小累计阻力模型和电路理论等方法,识别了生态源地、生态廊道、生态“夹点”、障碍区等生态安全格局要素,分析了2000—2020年生态安全格局及其动态变化,并识别生态保护修复关键区域。研究结果表明:① 2000—2020年贾汪区生态系统服务总体呈增加趋势,生态环境逐步得到改善,生态源地斑块数量逐渐减少但总面积持续增加,廊道分布由“西多东少”转变为“较为均衡”的格局。② 确定生态保护修复关键区包括重要生态源地10处,重要生态廊道39处,障碍修复关键区5.53 km2,廊道保护关键区1.70 km2,多位于主城区西南部和潘安湖南部生态流动强度高且廊道狭窄处,应加强重点修复和保护。③ 根据生态保护修复关键区覆被类型,建议重要生态源地树立红线观念、加强生态用地和非生态用地有效连接、拓宽生态廊道范围、增加廊道沿线植被恢复等保护修复策略。研究结果可为资源枯竭型城市的生态修复规划确定优先修复事项提供有效技术支撑。

       

      Abstract: The scientific construction of ecological security pattern and the identification of key areas for ecological protection and restoration are the essential guarantees and important approaches to systematically promote the goal of ecological restoration and realize the green transformation development and ecological security of resource-exhausted cities. Taking Jiawang District of Xuzhou City, a typical resource-exhausted city in eastern China as an example, this paper analyzed the effectiveness of ecological restoration and management in Jiawang District during its green transformation by quantitatively assessing the changes in five ecosystem service functions: soil retention, carbon storage, habitat quality, water yield, and carbon sequestration and oxygen release. On this basis, based on hot spot analysis, minimum cumulative resistance model and circuit theory, the ecological security pattern elements such as ecological sources, ecological corridors, ecological “pinch points” and obstacle areas are identified, the ecological security pattern and its dynamic changes from 2000 to 2020 are analyzed, and the key areas for ecological protection and restoration are identified. The results show that from 2000 to 2020, the ecosystem services in Jiawang District show an increasing trend, the ecological environment gradually improved. The number of patches in the ecological source area gradually decreased, but the total area continued to increase, and the corridor distribution changed from “more in the west and less in the east” to a “more balanced ecological security pattern”. The key areas for ecological protection and restoration were determined to include 10 important ecological source areas, 39 important ecological corridors, 5.53 km2 key area for obstacle restoration and 1.70 km2 key area for corridor protection, mostly located in the southwest of the main city and the south of Pan’an Lake where the ecological flow intensity is high and the corridor is narrow, so the key restoration and protection should be strengthened. Based on the coverage types of the key areas for ecological protection and restoration, recommendations include establishing a red-line concept for important ecological source areas, strengthening the effective connection between ecological and non-ecological land uses, expanding the scope of ecological corridors, and increasing vegetation restoration along the corridors as part of the protection and restoration strategies. The research results can provide effective technical support for determining the priority of ecological restoration planning in resource-exhausted cities.

       

    /

    返回文章
    返回