从水文调节、水质改善、物质输入调控、生物多样性维持等方面梳理了滨岸带对河流生态系统的影响机制.滨岸带具有良好的水文调节效应, 这种调节效应主要通过滨岸带植被根系对土壤水分持留, 植物残体对径流路径的影响, 以及挺水和沉水植物对水流的物理作用等途径实现.滨岸带显著影响水质过程, 对于面源污染径流具有较好的净化效果.滨岸带能够经历周期性的干湿交替, 同时具有发达的植被系统和丰富的土壤微生物类型, 独特的水文和地球化学条件使滨岸带成为氮磷迁移转化的热区.滨岸带对水生态系统的物质输入起到重要的调控作用, 既能够为水体生态系统提供丰富的物质来源, 又能够避免过量的营养物质输入.这种调控作用对于水生态系统群落结构的维持和生态系统功能的发挥具有重要意义.滨岸带水生和湿生植被的生长使水体生态系统食物链不断完善, 大型无脊椎生物和鱼类种群数量得以增加, 对水体生物多样性的提升具有明显的贡献.自然的洪水扰动可能是滨岸带生物多样性的维持机制, 而水媒传播过程则可能是滨岸带影响河流生物多样性的重要机制.当前对于滨岸带生态机制过程的认识尚不够深入, 今后滨岸带研究要加强物质过程和生态学过程的探讨, 尤其是水文、水质、生物群落等要素的耦合机制, 滨岸带水环境效应的模拟预测, 以及滨岸带对河流生物多样性的影响机制研究等.

Brandisia hancei (Paulowniaceae) is a widely distributed shrub in karst regions in southwestern China. Its seeds have a membranous wing, and they mature just before the rainy season begins. To assess the effect of the wing on seed dispersal and germination of B. hancei, we measured the dispersal distance at varying wind speeds and release heights, falling duration from different release heights, floating duration on still water, rates of imbibition of water, and drying and soil adherence to seeds. Germination experiments were conducted on intact and de-winged seeds immediately after harvest. The wing increased the falling duration in still air and the floating ability on water. Dispersal distance of winged and de-winged seeds did not differ at a wind speed of 2.8 m s-1, but at 3.6 and 4.0 m s-1 dispersal distances were greater for de-winged than for winged seeds. Seed wing had little effect of absorption and retention of water, but significantly increased soil adherence to the seeds. Mature seeds were non-dormant and germinated to over 90％with a mean germination time of about 10 days. By combining the environmental conditions in karst habitat with the seed traits of B. hancei, we conclude that dispersal and germination of winged seeds are adapted to the precipitation seasonality in heterogeneous habitats absence of soil.