“…Researchers proposed the Sources-Resistance Surface-Corridors framework [17] upon the delimitation of ecological spaces based on ecological security patterns [4] [6][8] [17] [19], in which accurately identifying sources is a key stage. Some studies selected nature reserves, scenic spots, park spaces, woodlands, and large cultivated lands as sources [12] [24], whereas the others accomplished this selection task by constructing evaluation index systems [5][13] [16][27] [28]. Specifically, Li [13] proposed the ecological security pattern in the area along the Yangtze River in Anhui Province, China, by combining indices on ecological sensitivity, biodiversity, and water source protection; Du [5] evaluated the ecological importance using ecosystem services (e.g., biological resource protection, water resource security, and nutrient maintenance) to identify the ecological sources and guide the construction of mountainous towns in Dali Prefecture, China; Peng [16] identified the ecological sources in the Xiongan New Area, China, by evaluating 5 ecosystem services, including food supply, water yield, soil conservation, habitat maintenance, and near-water recreation, and proposed an optimization scheme of the ecological security pattern; Zhang [27] devised the ecological network framework of Yingkou City, China, by selecting ecological sources based on ecological sensitivity and importance of ecosystem service function.…”