| 金沙江下游梯级水库浮游细菌群落结构及生态过程 |
| 摘要点击 219 全文点击 17 投稿时间：2024-04-03 修订日期：2024-07-03 |
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| 中文关键词 水库调度运行 梯级水库 浮游细菌 网络特性 群落构建 |
| 英文关键词 reservoir operation scheduling cascade reservoir bacterioplankton network characteristics community assembly |
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| 中文摘要 |
| 浮游细菌是淡水生态系统的重要组成部分,对碳氮磷等生源要素的生物地球化学循环过程具有重要作用.大坝运行会导致水库的水文条件发生显著变化,影响淡水生态系统.探究不同水文条件下浮游细菌群落结构和生态过程是了解大坝对河流生态系统影响的关键.以金沙江下游溪洛渡-向家坝梯级水库为研究对象,利用16S rRNA扩增测序分析了水库不同调度运行下水体中浮游细菌群落结构和群落构建生态过程的差异.结果表明：Simpson指数、Chao指数、水温、溶解性有机碳（DOC）浓度和总磷（TP）浓度在低水位时期更高,水力停留时间、pH、水位在高水位时期更高.高、低水位时期浮游细菌群落组成差异显著.绿弯菌门（Chloroflexi）、芽单胞菌门（Gemmatimonadota）、蓝细菌门（Cyanobacteria）、硝化螺旋菌门（Nitrospirota）和噬氢菌门（Hydrogenedentes）对水位变化环境敏感.蓝细菌门（Cyanobacteria）和硝化螺旋菌门是浮游细菌网络的关键物种.低水位时期浮游细菌网络关键物种类别和丰度高于高水位时期,低水位时期浮游细菌网络复杂性和稳定性更高.高、低水位时期浮游细菌群落构建均以随机性过程为主导.因此,水库不同调度运行影响了浮游细菌群落结构和生态过程,进而影响了碳氮元素的循环过程.研究结果对于认识筑坝蓄水下河库生境水生态系统结构及功能,以及指导高坝大库管理具有重要的学术价值与科学意义. |
| 英文摘要 |
| Bacterioplankton are an important component of freshwater ecosystems and play a crucial role in the biogeochemical cycling of biogenic elements, such as carbon, nitrogen, and phosphorus. The operation of dams can cause notable changes in the hydrological conditions of reservoirs, affecting freshwater ecosystems. Exploring the community structure and ecological processes of bacterioplankton under different hydrological conditions is key to understanding the impact of dams on river ecosystems. Taking the Xiluodu-Xiangjiaba cascade reservoirs in the lower reaches of the Jinsha River as the research object, 16S rRNA amplification sequencing was used to analyze the differences in the community structure and ecological process of bacterioplankton in the water under different scheduling operations of the reservoir. The results indicated that the Simpson index, Chao index, water temperature, dissolved organic carbon （DOC） concentration, and total phosphorus （TP） concentration were higher during the low water level period, whereas the hydraulic retention time, pH, and water level were higher during the high water level period. Significant differences were observed in the composition of bacterioplankton communities between the high and low water level periods. Chloroflexi, Gemmatimonadota, Cyanobacteria, Nitrospirota, and Hydrogenedentes were sensitive to changes in water level environments. Cyanobacteria and Nitrospirota were key species in the bacterioplankton networks. During the low water level period, the diversity and abundance of key species in the bacterioplankton network were higher than those during the high water level period, resulting in a more complex and stable network. During both high and low water level periods, the assembly of bacterioplankton communities were dominated by stochastic processes. Therefore, different scheduling operations of reservoirs affected the community structure and ecological processes of bacterioplankton, thereby affecting the cycling process of carbon and nitrogen elements. The research results have important academic value and scientific importance for understanding the structure and function of aquatic ecosystems in river and reservoir habitats under dam construction and water storage, as well as guiding the management of high dams and large reservoirs. |
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