Ecological protection and the restoration of full-array ecosystems is an important part of ecological civilization construction, which is a powerful measure to implement the concept of green development and help bridge the gap between the respective inevitable requirements of the current ecological environment and economic development. To solve this problem, a multi-scale index system was constructed to identify ecological sources comprehensively. The minimum-cost path method, the circuit theory, and the cyclic window search method were adopted to quantitatively identify the important ecological sources and corridors in scale nesting and pinch points and barrier points that affect multi-level connectivity. Furthermore, the specific optimization layout strategy of the ecological network structure of the Hefei metropolitan area was proposed. According to the results, if ecological sources and corridors at two scales are overlaid, the coincident area of ecological sources at two scales is 1719.95 km². As important ecological sources, Chaohu Lake Basin, Niuwangzhai, and Wuding Mountain, which are important areas to maintain the ecological network, need to be protected. Ten overlapping ecological corridors, which are mainly distributed in Changfeng County, are easily damaged long term. As a result, ecological nodes should be set up as temporary habitats for species transfer. In addition, based on the circuit theory and the cyclic window search method, calculating areas of pinch points at two scales yields 1637.75 km² and 434.22 km², respectively, and for areas of barrier points yields 2182.75 km² and 126.97 km², respectively. The ecological pinch points at two overlapping scales among them are important areas for future protection. Due to the small and fragmented spatial distribution in the urban area, pinch points with an average size of 0.58 km² are easy to be restored and will greatly improve the connectivity of the ecological network after restoration. Furthermore, through the quantitative identification of ecological network elements of two scales, the paper puts forward an optimization strategy for an ecological network in the Hefei metropolitan area from three aspects of "point-line-polygon." The research results can reference decision-making concerning the delineation of urban growth boundary, regional ecological security pattern, land space renovation, and ecosystem restoration.

中文翻译：

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基于多尺度转换和嵌套的生态网络建设

生态保护和生态系统的全面恢复是生态文明建设的重要组成部分，是实施绿色发展理念，弥合当前生态环境与经济发展各自必然要求之间差距的有力措施。为解决这一问题，构建了多尺度指标体系来全面识别生态资源。采用最小成本路径法，电路理论和循环窗口搜索法，在规模嵌套，影响多级连通性的收缩点和障碍点中，定量识别重要的生态源和走廊。提出了合肥都市圈生态网络结构的具体优化布局策略。²。作为重要的生态资源，巢湖流域，牛王寨和武定山是维护生态网络的重要区域，需要予以保护。十个重叠的生态走廊主要长期分布在长丰县，很容易受到长期破坏。因此，应将生态节点设置为物种转移的临时栖息地。另外，基于电路理论和循环窗口搜索方法，在两个尺度上分别计算收缩点的面积分别为1637.75 km ²和434.22 km ²，而对于障碍点的面积则分别为2182.75 km ²和126.97 km ²， 分别。其中两个相互重叠的尺度上的生态紧缩点是未来保护的重要领域。由于市区空间分布小而分散，平均点大小为0.58 km ^2的收缩点易于恢复，恢复后将大大改善生态网络的连通性。此外，通过定量识别两个尺度的生态网络要素，从“点线多边形”三个方面提出了合肥都市圈生态网络的优化策略。研究结果可为城市增长边界的界定，区域生态安全格局，土地空间更新和生态系统恢复等方面的决策提供参考。