| 宁夏沙湖沉水植物恢复初期沉积物细菌群落特征研究 |
| Sediment Bacterial Community Structure During Restoration of Submerged Macrophytes in Shahu Lake, Ningxia |
| 投稿时间：2021-06-11 修订日期：2021-07-10 |
| DOI：10.15928/j.1674-3075.202106110185 |
| 中文关键词:沉积物细菌群落 沉水植物 冗余分析 宁夏沙湖 |
| 英文关键词:sediment microbial community submerged macrophyte redundancy analysis Shahu Lake in Ningxia |
| 基金项目:宁夏回族自治区重点研发计划(2017BY087) |
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| 中文摘要: |
| 揭示了微咸水湖沙湖沉水植物恢复初期沉积物细菌群落特征，为微咸水湖沉积物生态修复提供参考。在沙湖南部选取A、B两个区域进行沉水植物恢复示范，并于1年内调查沉水植物生长状况和沉积物细菌群落特征，分析沉积物中细菌群落结构和沉水植物群落演替的相关性。研究结果表明，篦齿眼子菜在植物群落演替过程中的优势逐渐扩大，1年后成为单一优势种，示范区A、B和对照区C沉积物中细菌优势菌门为变形菌门（相对丰度分别为：42.0%、50.3%、46.7%）、拟杆菌门（6.3%、9.8%、6.4%）、绿弯菌门（6.4%、4.9%、9.4%）和厚壁菌门（5.9%、5.7%、1.3%）等。双因素方差分析表明：时间、位点对沉积物优势菌门、属的相对丰度均有显著影响，时间和位点的交互作用显著影响螺杆菌属、芽孢杆菌属。冗余分析结果表明，沉水植物种类对沉积物细菌群落结构的影响较为显著，其中篦齿眼子菜对沉积物细菌的群落结构影响最大，其优势度决定了沉积物细菌核心群落的演化。在门水平上，篦齿眼子菜的盖度与蓝细菌门呈极强的正相关，与变形菌门呈负相关。在属水平上，粘液杆菌属和芽殖杆菌属与篦齿眼子菜的盖度呈正相关，芽孢杆菌属和发光杆菌属与篦齿眼子菜的盖度呈负相关。 |
| 英文摘要: |
| Shahu Lake is the largest low salinity lake in Ningxia Hui Autonomous Region. In recent years, the aquatic ecological environment of Shahu Lake has gradually deteriorated, and aquatic vegetation has declined. Submerged macrophytes are an important plant group for ecological restoration of eutrophic waters. In this study, Shahu Lake was selected for study and we measured the changes occurring in the submerged macrophyte community and structure of the sediment bacteria community during the first year after restoring the submerged macrophytes. The relationship of changes in the sediment microbial community with succession of the submerged macrophyte community was explored. In June 2019, two demonstration areas (A, B) and a control group (C) were set in south Shahu Lake and six submerged macrophytes were planted in each demonstration area with an initial coverage of 5%. In September 2019 and May 2020, the growth status of submerged macrophytes was investigated, including species composition and coverage. In June and September 2019 and May 2020, sediment and water samples were collected for determination of sediment bacteria and water environmental parameters. Results show that the submerged macrophyte coverage in the demonstration areas was 60%, Potamogeton pectinatus L. gradually expanded and was the dominant species one year after restoration. The dominant bacteria phyla in the sediments of areas A and B and C were Proteobacteria (relative abundances of 42.0%, 50.3%, 46.7%), Bacteroidetes (6.3%, 9.8%, 6.4%) and Firmicutes (5.9%, 5.7%, 1.3% ). Time and location had significant impact on the relative abundance of dominant phyla and genera, and their interaction had a highly significant impact on the abundance of Sulfurovum and Bacillariophyta. Redundancy analysis shows that the species of submerged macrophytes had a significant impact on the sediment bacteria community structure, and Potamogeton pectinatus L. had the greatest impact on community structure and determined the evolution of the core microorganism community in the sediments. At the phylum level, the coverage of Potamogeton pectinatus L. had a very strong positive correlation with Cyanobacteria and a negative correlation with Proteobacteria. At the genus level, Lutibacter and Gemmobacter were positively correlated with Potamogeton pectinatus L. coverage, Bacillus and Photobacterium were negatively correlated with Potamogeton pectinatus L. coverage. This paper characterizes the sediment bacteria community shortly after restoring the submerged macrophytes in Shahu Lake, and provides a reference for ecological restoration of sediments in brackish lakes. |
| 刘相粉,王川,何鹏,武俊梅,吴振斌,周巧红.2023.宁夏沙湖沉水植物恢复初期沉积物细菌群落特征研究[J].水生态学杂志,44(1):92-100. |
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