■鄱阳湖是中国最大的淡水湖,对鄱阳湖的细菌组成和多样性进行了多项研究,而对鄱阳湖极端汛期细菌群落对环境因子响应的定量研究较少。
■在2020年的汛期调查了鄱阳湖细菌群落组成(BCC)的连通湖泊异质性。本研究采用Illumina高通量测序技术。
■极端洪水季节,水中的细菌群落结构与鄱阳湖沉积物中的细菌群落结构不同。水中的细菌多样性远低于沉积物。在水柱中,优势门是放线菌,虽然沉积物中的细菌成分比水中的细菌成分更复杂,沉积物中的优势门是变形杆菌,氯氟菌,酸杆菌,和放线菌.鄱阳湖水体中细菌多样性呈季节动态,而没有观察到沉积物中细菌群落的季节性变化。鄱阳湖两个海湾和河道区沉积物中的细菌群落结构可以相互区分。从三岔湾到周溪湾再到河道,沉积物中的微生物多样性逐渐增加,但是沉积物中的总氮(TN)浓度(STN)和沉积物中的总磷(TP)浓度(STP)表现出相反的趋势。这可能是由于极端洪水造成的人为干扰。细菌群落结构,水柱与WT显著相关,NH4-N,STP,SOM,Chla,DO,TP,Eh,沉积物中的细菌群落结构与SOM和STP显著相关。
■极端汛期鄱阳湖水体中的细菌群落结构与沉积物中的细菌群落结构有很大不同。水柱中的细菌群落结构不仅对水的地球化学特征敏感,而且还受到沉积物中某些养分浓度的影响。在雨季,细菌多样性仅受到SOM和STP的影响。
UNASSIGNED: Poyang Lake is the largest freshwater lake in China, and there are several studies on the composition and diversity of bacteria in Poyang Lake, while few quantitative studies were carried out on the response of the bacterial community to environmental factors during the extreme flood season in Poyang Lake.
UNASSIGNED: The connected-lake heterogeneity of bacterial community composition (BCC) was investigated in Poyang Lake during the flood season in 2020. Illumina high-throughput sequencing technology was used in this study.
UNASSIGNED: The bacterial community structure in the water was different from that in the sediment of Poyang Lake during extreme flood seasons. The bacterial diversity in water was much lower than that in sediment. In the water column, the dominant phyla were Actinobacteriota, while the composition of bacteria in sediment was more complex than that in water, and the dominant phyla in sediment were Proteobacteria, Chloroflexi, Acidobacteriota, and Actinobacteriota. The bacterial diversity in the water of Poyang Lake showed seasonal dynamics, while no seasonal variation of bacterial communities in sediment was observed. The bacterial community structure in the sediment from the two bays and channel areas of Poyang Lake can be distinguished from each other. The microbial diversity in sediment gradually increased from the Sancha Bay to the Zhouxi Bay and then to the channel, but the total nitrogen (TN) concentration in sediment (STN) and the total phosphorus (TP) concentration in sediment (STP) showed opposite trends. This might be due to the anthropogenic disturbances from the extreme flood. The bacterial community structure in, water column was significantly correlated with WT, NH4-N, STP, SOM, Chl a, DO, TP, and Eh, while the bacterial community structure in sediment was significantly correlated with SOM and STP.
UNASSIGNED: The bacterial community structure in water was greatly different from that in sediment in Poyang Lake during extreme flood seasons. The bacterial community structure in the water column was not only sensitive to the geochemical characteristics of the water but also affected by some nutrient concentrations in the sediment. During the wet seasons, bacterial diversity was only affected by SOM and STP.