河流梯级水电开发是我国未来一段时间内应对能源结构调整与环境保护的重要手段，如何缓解其对生态环境，尤其是河岸植被与植物繁殖体的影响成为决策者不能回避的难题。为了解山地河流梯级水电开发后河岸植被与植物繁殖体沿河流纵向和横向梯度的时空分布格局与演替机制，以福建九龙江源头的地村溪和竹南溪为研究对象，以河岸植被和植物繁殖体为切入点，综合运用“3S”技术、野外定点实验和室内萌发实验等方法，进行自然与人为二元干扰下山地河流河岸植被时空分布格局，山地河流河岸植物繁殖体传播、扩散机制，河岸植被与河流水文、生境及水电开发之间的耦合关系，以及山地河流河岸植物群落特征与植物繁殖体特性之间相关性的研究，阐明山地河流水电开发后河岸植被与植物繁殖体的时空分布格局，揭示了梯级水电开发后河岸植被与植物繁殖体的演替规律。研究结果对科学评估水电开发对河岸植被的影响、山地河流河岸植被的生态修复与重建奠定了理论基础。

River damming provides a dominant human impact on river environments worldwide, and while local impacts of reservoir flooding are immediate, subsequent ecological impacts downstream can be extensive. Cascade hydropower development will still be the main method in a future time to deal with the national energy structure adjustment and environmental protection, and how to mitigate its impact on riparian vegetation and plant propagule becomes a significant problem that the decision makers cannot avoid. To understand the spatio-temporal distribution patterns and successional mechanism of riparian vegetation and plant propagule along river longitudinal and lateral under cascade hydropower development, the headstream of Jiulongjiang River will be taken, Dicun River and Zhunan River, as the research area, and riparian vegetation and plant propagule as the starting point, and combine 3S technology, field experiments, and germination experiment to study the following contents. (1) spatiotemporal patterns of riparian vegetation under natural and human-caused disturbance. (2)transmission mechanism of plant propagule. (3) spatial distribution patterns of riparian vegetation under different flow regimes. (4) the characteristics and spatial distribution of standing vegetation in relation to patterns of propagule dispersal along free-flowing and regulated river reaches. The results will elucidate the responses of riparian vegetation to hydropower development, and reveal the successional law and mechanism of formed and developed riparian vegetation along mountain river. Results of this work will provide scientific basis for evaluating the ecological impact of dam construction on riparian vegetation, restoration and rehabilitation of riparian vegetation.