| This article has been：Browse 97Times Download 5Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2026097 |
|
| Seasonal variation in aquatic bacterial communities and their environmental drivers in an arid-region wetland |
|
Zhang Xubin, Dong Junlin, Qiu Xiaocong, Yin Juan
|
|
1. School of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan 756000, China;
2. Ningxia Guyuan No.4 Middle School, Guyuan 756000, China; 3. School of Civil and Hydraulic Engineering,
Ningxia University, Yinchuan 750021, China; 4. School of Life Sciences, Ningxia University, Yinchuan 750021, China
|
| Abstract: |
| 【Objective】Aquatic ecosystems in arid regions are sensitive to environmental fluctuations. This study investigated seasonal variation in bacterial communities and the underlying environmental drivers in Taiyangshan Wetland, an arid-region wetland in Ningxia Province, China. 【Method】The study combined physicochemical analyses of water samples collected from the wetland, with high-throughput 16S rRNA gene sequencing to characterize seasonal changes in bacterial community structure and identify their environmental drivers.【Result】①The physicochemical properties of the aquatic environment in Taiyangshan Wetland showed significant seasonal variation. Ammonium concentrations were higher in July, whereas concentrations of total phosphorus and fluoride ions were higher in October; fluoride concentrations were also relatively high in April. ②Bacterial diversity in the water was significantly higher in summer than in spring and autumn (P＜0.05). The combined effects of temperature and nutrient availability were associated with greater bacterial richness in July, whereas low temperature and high-fluoride stress in April and October were environmental factors associated with the low bacterial community diversity. ③Proteobacteria, Bacteroidetes, and Actinobacteria were the dominant bacterial phyla throughout the three seasons. In addition, relatively high abundances of Desulfomicrobium and Treponema were detected at several sampling sites, potentially indicating anaerobic conditions in sediments and the influence of external organic inputs. ④Redundancy analysis showed that samples taken in April were more closely associated with water temperature, chlorophyll a and total phosphorus, whereas samples taken in October were more strongly associated with total nitrogen, pH, fluoride ions, electrical conductivity, total dissolved solids and water salinity.【Conclusion】High temperature and ammonium concentrations in July were associated with greater bacterial diversity and community evenness. In contrast, low temperature, high fluoride concentrations and water salinity in spring and autumn were associated with low bacterial diversity. These findings demonstrate that seasonal changes in physicochemical conditions, particularly temperature, nutrient availability, fluoride and water salinity, are important drivers of bacterial community variation in arid-region wetlands. |
| Key words: wetland bacterial community seasonal succession environmental driving factors |
|
|
