随着城乡建设速度加快，环境污染现象日益严峻，如何加强环境监测和治理，科学合理地调控和优化环境，达到可持续的社会经济发展目标是目前的首要任务。因此，我们应该确保环境的可持续性，并且制定合理的环境标准，为改善区域生境质量提供现实依据。近年来，绿色基础设施已逐渐应用于生态环境的质量调控，绿色基础设施的建立不仅可以满足区域的发展需求，而且可以保证生态环境的可持续性。目前绿色基础设施的研究主要趋向于城市内部空间，但是对于县域层次的研究较为少见。本文选取景泰县为研究区，将县域绿色基础设施定义为研究对象，结合生态系统服务重要性和生态敏感性评估模型对景泰县进行生态本底评估，找到景泰县生态环境存在的问题，进而提取区域绿色基础设施源地，结合景观连通性和景观格局对源地进行重要性评价；利用最小累计阻力模型进行绿色基础设施廊道和节点的模拟，结合重力模型对廊道和节点进行重要性评价，最终构建区域绿色基础设施网络；结合区域生态环境特征和电路理论提出绿色基础设施网络优化策略；结合相关自然地理要素构建区域生态空间调控路径。

研究结论如下：（1）景泰县生态系统服务重要性评估和生态敏感性评估结果显示，景泰县部分区域水土流失和土地沙化现象严重，县域生态系统服务重要性以不重要为主且生态敏感性整体偏高。（2）将生态保护极重要区与区域各类重要功能区叠加，依据叠加结果共提取绿色基础设施源地21个，基于景观连通性和景观格局评估方法对源地进行重要性分级，得到一级源地2个，二级源地11个、三级源地8个。（3）通过MCR模型的模拟结果，共提取绿色基础设施廊道41条，基于重力模型的相互作用原理，对廊道进行重要性评估分级，共得到关键廊道23条，重要廊道10条，一般廊道8条。（4）基于环境稳定性、连通性和安全性需求，共提取七类重要节点48个，根据节点所在绿色基础设施廊道的重要性级别，对节点进行重要性分级，得到一级节点21个，二级节点13个，三级节点9个。（5）利用电路理论对绿色基础设施网络进行优化调整，共得到源地21个、廊道55条、节点62个。（6）根据景泰县的行政区域、气候条件、地理环境以及植被覆盖情况，将其划分成3个一级管控区：Ⅰ西南部水土保持林业区、Ⅱ中部水源涵养农牧区、Ⅲ西南部生态修复牧业区，对三类分区分别提出不同的分区调控措施；基于一级管控分区，将前文生态敏感性评估和生态系统服务评估结果进行空间叠加，利用叠加结果划分了二级管控区，共得到19个二级管控区：生态保护区、生态控制区、城镇发展区；最后，分别对管控区、控制区和发展区提出相应调控措施。

本文通过分析区域绿色基础设施相关理论和研究方法，以景泰县为例，通过对县域绿色基础设施源地的评判、筛选以及廊道和节点的提取，提出“保护源地-提升廊道-强化节点”的优化策略和生态空间调控路径体系。该研究成果针对景泰县构筑生态屏障、优化空间结构、协调保护与发展共同推进理念问题提出了相应调控措施，以期为同类型县域层次的生态空间调控和绿色基础设施网络构建，提供有益借鉴。

With the accelerated pace of urban and rural development, environmental pollution has become increasingly severe. The primary task at present is to strengthen environmental monitoring and governance, scientifically and rationally regulate and optimize the environment, and achieve sustainable socioeconomic development goals. Therefore, we should ensure the sustainability of the environment and establish reasonable environmental standards to provide a practical basis for improving regional habitat quality. In recent years, green infrastructure has gradually been applied to quality control of ecological environments. The establishment of green infrastructure can not only meet regional development needs but also ensure the sustainability of the ecological environment. Currently, research on green infrastructure mainly focuses on urban areas, with limited studies at the county level. In this study, Jingtai County is selected as the research area, and county-level green infrastructure is defined as the research object. Ecological background assessment of Jingtai County is conducted, combining the importance of ecosystem services and ecological sensitivity assessment models, to identify the ecological environment issues in Jingtai County. Subsequently, the regional green infrastructure source areas are identified, and their importance is evaluated based on landscape connectivity and pattern. The simulation of green infrastructure corridors and nodes is carried out using the least cumulative resistance model, and their importance is evaluated with the gravity model, ultimately constructing a regional green infrastructure network. Optimization strategies for the regional green infrastructure network are proposed based on regional ecological and environmental characteristics and circuit theory. Ecological spatial regulation paths for the region are constructed by incorporating relevant natural geographical elements.

The research conclusions are as follows: (1) The results of the assessment of the importance of ecosystem services and ecological sensitivity in Jingtaixian show that some areas of Jingtaixian have serious problems of soil erosion and land desertification. The importance of ecosystem services in the county is mainly unimportant, and the overall ecological sensitivity is high. (2) By overlaying the ecologically protected extremely important areas with various types of important functional areas in the region, 21 source areas of green infrastructure were extracted. Based on the landscape connectivity and landscape pattern evaluation method, the source areas were classified into first-class (2), second-class (11), and third-class (8). (3) Based on the simulation results of the MCR model, 41 green infrastructure corridors were identified. Based on the principle of gravitational interaction of the gravity model, the corridors were evaluated and classified into key corridors (23), important corridors (10), and general corridors (8). (4)Based on the requirements of environmental stability, connectivity, and safety, a total of 48 important nodes were extracted and classified into seven categories. According to the importance level of the green infrastructure corridor where the nodes are located, the nodes were further classified into three levels: 21 nodes of level one, 13 nodes of level two, and nine nodes of level three.(5)Using circuit theory, the green infrastructure network was optimized and adjusted, resulting in 21 source locations, 55 corridors, and 62 nodes.(6)Taking into account the administrative divisions, climate conditions, geographical environment, and vegetation coverage of Jing Tai County, it was divided into three primary control areas: the Southwest Soil and Water Conservation Forestry Area (Area I), the Central Water Source Conservation Agricultural and Pastoral Area (Area II), and the Southwest Ecological Restoration Pastoral Area (Area III). Different control measures were proposed for the three areas.Based on the primary control areas, the results of the ecological sensitivity assessment and ecosystem services evaluation were spatially overlaid to divide the secondary control areas into 19 areas, including ecological protection areas, ecological control areas, and urban development areas. Finally, corresponding control measures were proposed for the control, management.

This article analyzes the theory and research methods related to regional green infrastructure and, taking Jing Tai County as an example, proposes an optimization strategy and ecological spatial regulation path system of "protecting source locations, enhancing corridors, and strengthening nodes" through evaluating and selecting the source locations, corridors, and nodes of the county's green infrastructure.The research results propose corresponding control measures for issues such as constructing an ecological barrier, optimizing spatial structure, and promoting the coordinated development and protection of the county, aiming to provide beneficial reference for ecological spatial regulation and green infrastructure network construction at the same level of similar counties.