| 金沙江下游大坝建设对纵向连通性的影响研究 |
| Impact of Dam Construction on the Longitudinal Connectivity of the Lower Jinsha River |
| 投稿时间：2023-11-05 修订日期：2023-11-30 |
| DOI：10.15928/j.1674-3075.202311050311 |
| 中文关键词:树状水系 连通性指数DCI 修复次序 金沙江下游 |
| 英文关键词:dendritic river systems dendritic connectivity index restoration sequencing Jinsha River |
| 基金项目:国家重点研发计划（2022YFC3203900） |
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| 中文摘要: |
| 金沙江下游生态系统的复杂多样性使其成为众多重点保护、濒危、珍稀和特有鱼类等集中分布的水生生物多样性中心，但近年来因高密度、高强度梯级水电站工程建设的阻隔影响而明显衰退。为采取有效措施恢复连通性以减缓不利影响，以流域为单元，基于金沙江下游干流及支流DEM和水库、水电站建设数据，采用树状水系连通性指数方法分析流域内由于大坝所造成的阻隔影响，并对金沙江下游纵向连通性进行了评价。结果表明当大坝通过能力逐步提升，尤其是提升至0.7后，水系整体连通度呈显著增大趋势，连通性明显向好；金沙江下游水系连通性修复次序建议为，第一期：黑水河、西溪河、牛栏江；第二期：普渡河、西宁河、龙川江、鲹鱼河；远期：横江、普隆河、美姑河、以礼河、勐果河、小江。研究结果可为制定和实施流域鱼类洄游通道恢复工程及行动计划、促进水生生物保护提供基础支撑。 |
| 英文摘要: |
| The complex, diverse ecosystem of the lower Jinsha River makes it a center of aquatic biodiversity, inhabited by numerous protected, endangered, rare and endemic fish species. However, ecosystem health in the lower Jinsha River has significantly deteriorated in recent years due to fragmentation by high-density, high-intensity cascaded hydropower stations. In this study, the main stem and the tributaries of the lower Jinsha River were treated as individual watershed units, and we constructed a dendritic diagram of watershed unit connectivity, analyzed the effects of fragmentation caused by dams within the watersheds, and quantitatively assessed the longitudinal connectivity of the lower Jinsha River using the dendritic connectivity index (DCI). The study was based on digital elevation models (DEM) of the main stem and tributaries of the lower Jinsha River, along with data on reservoirs and hydropower station construction. Results show that dam passage capacity in the lower Jinsha River gradually increased, and the connectivity index of the lower Jinsha River trended upward as the passable capacity of the dams increased. More specifically, when the DCI reached 0.7, the overall connectivity of the watershed improved significantly. We then further analyzed the relationship of the watershed connectivity index in the lower Jinsha River with dam construction on the 14 tributaries and, based on the results, we recommend a three-phase sequence of watershed restoration: Phase 1 would restore watershed connectivity among the rivers most influencing watershed connectivity, including Heishui River, Xixi River, Niulan River; in Phase 2, connectivity of rivers with less influence would be restored, including Pudu River, Xining River, Longchuan River and Shenyu River; Phase 3 would involve longer term connectivity restoration of rivers of least influence, including Henghe River, Pulong River, Meigu River, Yili River, Mengguo River and Xiaojiang River. Our research provides base data to support planning and implementation for an effective connectivity restoration effort and the preservation of aquatic biodiversity. |
| 侯轶群,邹 曦,陈小娟,金 瑶,杨 志,刘宏高.2024.金沙江下游大坝建设对纵向连通性的影响研究[J].水生态学杂志,45(1):26-31. |
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