Abstract:Ecological protection and restoration of territorial space is an important guarantee for maintaining national ecological security patterns, and scientific zoning and manage the key areas for protection and restoration is of great significance to maintain regional ecosystem function and sustainable development. Taking Shanghang County in Fujian Province as a typical study area case, this study constructed a multi-dimensional ecosystem measurement framework of "Ecosystem Importance - Ecosystem Fragility - Ecosystem service value" based on integrating ecosystem integrity, systematisms, and ecological benefits. And then, we analyzed the multi-dimensional characteristics of the regional ecosystem and the relationship of trade-offs and synergy between measure factors. At last, spatial clustering method (Grouping analysis) was used to delineate the ecological protection and restoration space, and the zoning management and control strategies were proposed based on the spatial heterogeneity and ecosystem structure characteristics of each zone. The results showed that: 1) The ecosystem has strong spatial heterogeneity, showing a spatial differentiation ecosystem pattern with high importance, low fragility, and high service value in Shanghang County. 2) There were synergistic and tradeoff relationships among all ecosystem measure factors in study area. The relationship of comprehensive importance, fragility and service value are all synergistic, which may lead to high overlap between ecosystem conservation and restoration areas. 3) According to the results of CONTAG and COHESION index with different number of clusters, 6 was determined as the optimal number of clusters, indicating that the cohesion degree and connectivity among groups in the study area were the strongest, which was conducive to the stable and healthy development of the ecosystem. The study area can be divided into six zoning: III-I-V(Importance level III- Fragility level I-Value V), III-III-V(Importance level III- Fragility level III-Value V), III-II-V(Importance level III- Fragility level II-Value V), III-III-IV(Importance level III- Fragility level III-Value IV), II-III-I(Importance level II- Fragility level III-Value I) and IV-I-I(Importance level IV- Fragility level I-Value I), the zoning of III-I-V and III-II-V have large areas and are the ecosystem functional bases for regional development. The composition of land cover types in each zoning has obvious spatial heterogeneity and the forest, shrub, cropland, and garden were the dominant land cover types. 4) According to the characteristics and spatial distribution and internal structure of each zoning, we proposed targeted and differentiated ecological and economic management policies and environmental protection and restoration measures. The study area was further divided into ecological protection area (Ecological conservation area, green development area, Moderate development area) and ecological restoration area (Ecological restoration area, Protection and restoration coordinated development area) according to the ecological protection and restoration measures. The multi-dimensional ecosystem measurement "I-F-V" aims to identify important ecosystems, damaged areas of ecosystems and integrate ecosystem services benefits. While considering the integrity and systematisms of ecosystems, it also emphasizes the coordination of ecosystem protection and restoration costs and development opportunities. It effectively assesses the resilience and sustainability of ecosystems and the economic activities and human well-being they support, which can be widely used in ecosystem measurement and ecological conservation and restoration research and practice. The research results would provide scientific and comprehensive research ideas and practical reference for regional planning and construction of territorial space protection and restoration planning and construction, ecological security pattern maintenance.