State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China, Xi'an University of Technology, Xi' an, 710048, Shaanxi, China.
Environ Sci Pollut Res Int. 2021 Nov;28(43):61748-61759. doi: 10.1007/s11356-021-14906-2. Epub 2021 Jun 29.
The upper reaches of the Han River are the source region of water for the Middle Route of China's South-to-North Water Diversion Project, mainly for household, industrial, and irrigation purposes. Planktonic bacteria are more sensitive than macroorganisms to water physical and chemical properties and play a critical role in biogeochemical processes in river ecosystems. In November 2017 and April 2018, a systematic and methodical survey was carried out to evaluate the water quality and bacterial communities, on the mainstem of the Han River and its five main tributaries. In this study, high-throughput sequencing technology has been employed to investigate the bacterioplankton community composition. The results indicated the following: (1) diversity increased downstream, especially in the upper reaches of the Han River. (2) The relative abundance of Actinobacteria increased with the increase of river length, while that of Bacteroidetes decreased slightly. (3) Five tributaries were found to be importance sources of taxa to the Han River; however, in both months, a large proportion of operational taxonomic units (37.84% and 36.34%, respectively) had unknown sources. (4) Finally, redundancy analysis (RDA) and Bioenv analysis showed that environmental parameters (pH, TN, Cond, NH-N, DO, NO-N, Chl-a, and T) had a great influence (p ≤ 0.05) on the bacterioplankton community. These research results are beneficial for the managing the ecological system, protecting the tributary biodiversity, and conserving the mainstem and tributaries of the Han River basin.
汉江上源是南水北调中线工程的水源区，主要用于生活、工业和灌溉用水。浮游细菌比大型生物对水的物理化学性质更敏感，在河流生态系统的生物地球化学过程中起着关键作用。2017 年 11 月和 2018 年 4 月，对汉江上、中、下游干流及其五条主要支流的水质和细菌群落进行了系统、有针对性的调查。本研究采用高通量测序技术研究了细菌浮游生物群落的组成。结果表明：（1）多样性随河流长度的增加而增加，尤其是在上游。（2）随着河流长度的增加，放线菌的相对丰度增加，而拟杆菌的相对丰度略有减少。（3）发现五条支流是汉河流域分类群的重要来源，但在这两个月中，大量的操作分类单元（分别为 37.84%和 36.34%）来源不明。（4）最后，冗余分析（RDA）和生物环境分析表明，环境参数（pH、TN、Cond、NH-N、DO、NO-N、Chl-a 和 T）对细菌浮游生物群落有很大影响（p≤0.05）。这些研究结果有助于管理生态系统，保护支流的生物多样性，保护汉河流域的干流和支流。
