呼包鄂榆城市群耦合空间碳排放生态网络构建

构建生态网络是维持景观连通性、提升包括固碳在内的生态系统服务功能的重要手段。为了更好地响应固碳增汇目标及其政策要求，有必要将空间碳排放因素纳入区域生态网络分析框架。选择高能耗、高碳排且生态脆弱的呼包鄂榆城市群作为研究区，采用生态系统服务和连通性分析识别生态源地，并结合电路理论和重力模型提取生态廊道，得到区域景观生态格局；通过获取夜间灯光数据模拟得到城市群栅格尺度碳排放空间格局，并与景观生态格局进行空间叠加，以此补充“生态-碳排”耦合节点和规划廊道，进而构建考虑区域碳排放空间格局的城市群生态网络。结果表明：1)仅考虑生态因素构建的区域生态网络东西两侧生态源地连通性不足，网络呈“中部阻断型”分布；2)区域碳排放存在明显空间特征，高值区出现在人为生态扰动显著的中部矿产资源开发区和主要城镇地区；3)通过耦合区域碳排放格局，补充了23个“生态-碳排”耦合节点和67条规划廊道，生态网络结构由树状转变为蜂巢状，网络闭合度、线点率和连接度分别提升了92%、30.48%和27.45%。因此，通过耦合空间碳排放因素改进的生态网络构建方法，对于提高生态网络的多功能性和稳定性，以及促进以增加碳汇能力为目标的生...

Ecological network construction of coupling spatial carbon emissions in the Hohhot-Baotou-Ordos-Yulin urban agglomeration

Constructing an ecological network is an important means to maintain landscape connectivity and improve ecosystem services, including carbon sequestration. To better respond to the goal of carbon sequestration and its policy requirements, it is necessary to incorporate spatial carbon emission factors into the framework of regionally ecological network analysis. Taking the Hohhot-Baotou-Ordos-Yulin urban agglomeration with high energy consumption, high carbon emissions and fragile ecology as the study area, the ecological sources were identified based on ecosystem services and connectivity analysis, and ecological corridors were extracted by combining circuit theory and the gravity model to obtain the regional landscape ecological pattern. The grid-scale carbon emission spatial pattern of the urban agglomeration was simulated by obtaining nighttime light data, spatially superimposed with the landscape ecological pattern to supplement the "ecology-carbon emission" coupling nodes and planning corridors, and then constructing the urban agglomeration ecological network considering the regional carbon emission spatial pattern. The results showed that 1) the regionally ecological network constructed by only considering ecological factors had insufficient connectivity between ecological sources on the east and west sides, and it showed a "central-blocking" distribution. 2) Regional carbon emissions had obviously spatial characteristics, and high-value areas appeared in the central mineral resource development zones and the major urban areas with significantly anthropogenic ecological disturbances. 3) By coupling the regional carbon emission pattern, 23 "ecology-carbon emission" coupling nodes and 67 planned corridors were added, the ecological network structure changed from tree-like to honeycomb-like, and network circuitry, line-to-node ratio, and network connectivity increased by 92%, 30.48%, and 27.45%, respectively. Therefore, the improved ecological network construction method coupling spatial carbon emission factors is of great significance for improving the multiple functions and stability of the ecological network, as well as promoting ecological protection and restoration aimed at increasing carbon sequestration and sinks.