The Upstream Policy Gap: Synthesising Hydrological Science into Conservation Action for Poyang Lake’s Migratory Bird Sanctuary

Figure 1: The geographical position of China’s Poyang Lake (a) and its landscape pattern in dry and winter seasons (b, c) (Adapted from Wang et al, 2019; authors reproduced the figure). Figure 2: Flocks of migratory waterbirds, including Siberian Cranes (Grus leucogeranus), at Poyang Lake. The sanctuary's capacity to support such congregations is critically dependent on winter food resources governed by upstream hydrological connectivity. (Source: Authors) Figure 3: PRISMA flow diagram illustrating the systematic review process for evidence identification, screening, and inclusion. Figure 4: Convergence of Ganjiang River. (Source: Authors) Figure 5: Annual runoff, baseflow and BFI of Ganjiang Basin. (Source: Deng et al., 2025; authors reproduced the figure) Figure 6: Water management scenario in Ganjiang River (a) and the impact of climate change, anthropogenic activities, and their combined and synergistic effects on the alterations in hydrological regimes at the three stations of the Gan River (b). (Source: Y.H. Huang et al., 2024; authors reproduced the figure)图1：中国鄱阳湖（a）的地理位置及其冬枯季景观格局（b、c）（改编自Wang等，2019；经作者重制此图）。 图2：鄱阳湖流域成群的迁徙水鸟，包括白鹤（Grus leucogeranus）。该保护区支撑此类种群聚集的能力，关键依赖于受上游水文连通性调控的冬季食物资源。（来源：作者） 图3：PRISMA流程图，展示用于证据识别、筛选与纳入的系统评价流程。 图4：赣江汇流。（来源：作者） 图5：赣江流域年径流量、基流与基流指数（Base Flow Index, BFI）。（来源：Deng等，2025；经作者重制此图） 图6：赣江流域水资源管理情景（a），以及气候变化、人类活动及其联合与协同效应对赣江三个水文站水文情势改变的影响（b）。（来源：Y.H. Huang等，2024；经作者重制此图）