三峡水库干支流浮游植物群落演替规律及驱动机制研究进展

Research Progress of Phytoplankton Community Succession and Driving Mechanism in the Main and Tributary Streams of the Three Gorges Reservoir

从三峡水库干支流浮游植物群落演替机制角度开展水华形成机制研究具有重要的科学意义,系统凝练了国内外三峡水库干支流浮游植物群落演替规律及其驱动机制,总结了以下几点研究进展:干流浮游植物细胞密度显著低于支流浮游植物,受到干支流水动力特性影响,干流以"激流型"的硅藻门藻类为优势种,支流以"静水型"蓝藻和绿藻为优势种;干支流浮游植物细胞密度和群落结构主要受到生境扰动强度的影响,生境的扰动强度通过影响干支流水温、水体层化结构,光照强度、时间和频率,营养盐脉冲浓度和频率来驱动浮游植物群落结构的演替;浮游植物的演替过程更多的是"微生境"和浮游植物"细胞扩散"双重叠加的结果,"微生境"驱动强度强于"细胞扩散"过程。

It is of great scientific significance to study blooms from the mechanism of phytoplankton succession in the main and tributary streams of the Three Gorges Reservoir.This paper systematically condensed the succession rules and driving mechanisms of phytoplankton communities in the main and tributary streams of the Three Gorges Reservoir at home and abroad, and summarized the following research progress: Phytoplankton density of the main streams were significantly lower than that of tributaries, which were affected by the hydrodynamic characteristic parameters. Bacillariophyta dominated in the main streams, while Cyanophyta and Chlorophyta and the tributaries were in dominated in the tributaries.The disturbance intensity of the habitat conditions(including water temperature, under solar-thermal structure and nutrient pulse concentration) were the key regulatory factor for phytoplankton density and community structure in the main streams and tributaries of the Three Gorges Reservoir.The progress of phytoplankton succession were affected by the "aquatic-habits" and the mechanism of "frustule diffusion", the "aquatic-habits" were more impotant than the "frustule diffusion".