The variation of microbiological characteristics in surface waters during persistent precipitation

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Xinyan Xiao, Chenlan Chen, Haoran Li, Lihua Li, Xin Yu
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Abstract

Climate change leads to an increase in both the frequency and intensity of extreme precipitation. Surface runoff generated by extreme precipitation has a significant impact on water. However, the impact of persistent precipitation on surface water quality is easy to neglect, due to its prolonged duration and lower-intensity rainfall. This study established eight sampling points within selected surface waters to observe the variation of microbial characteristics in a typical persistence precipitation event. The primary difference between Furong Lake (FL) and Chengqian Reservoir (CR) was: the concentrations of dissolved organic carbon (DOC) were 21.3 ± 0.7 and 8.3 ± 1.5 mg/L in FL and CR, respectively. The concentrations of R2A culturable bacteria and coliforms were 104.57 and 101.58 colony-forming units (CFU)/mL in FL, and were 105.46 and 102.64 CFU/mL in CR, respectively. During precipitation, the maximum increase concentrations of R2A, NA culturable bacteria, and coliforms were 100.75, 101.30, and 102.27 CFU/mL in FL, respectively. Furthermore, microbial concentration and rainfall did not increase simultaneously, and a delay phenomenon was observed in the increasing microbial concentrations. Through analyzing the concentration change trends and correlation of various water quality indicators during persistent precipitation, the significant correlation between the DOC concentration and the changes in the dominant species of microbial community structure was found in this study (p < 0.05). For example, as the DOC concentration declined, the abundance of hgcl_clade and CL500-29_marine_group increased. Consequently, although persistent precipitation might not obviously alter the water quality visibly, it could still pose potential microbial risks.

Abstract Image

持续降水期间地表水微生物特征的变化
气候变化导致极端降水的频率和强度增加。极端降水产生的地表径流对水质有重大影响。然而,持续性降水由于持续时间长、降水强度低,对地表水水质的影响容易被忽视。本研究在选定的地表水体中设立了八个采样点,以观察典型持续降水事件中微生物特征的变化。芙蓉湖(FL)和城前水库(CR)的主要差异在于:芙蓉湖和城前水库的溶解有机碳(DOC)浓度分别为 21.3 ± 0.7 和 8.3 ± 1.5 mg/L。R2A 可培养细菌和大肠菌群的浓度在 FL 中分别为 104.57 和 101.58 菌落总数(CFU)/毫升,在 CR 中分别为 105.46 和 102.64 菌落总数(CFU)/毫升。降水期间,FL 中 R2A、NA 可培养细菌和大肠菌群浓度的最大增幅分别为 100.75、101.30 和 102.27 CFU/mL。此外,微生物浓度与降雨量的增加并不同步,微生物浓度的增加出现了延迟现象。通过分析持续降水过程中各种水质指标的浓度变化趋势及相关性,本研究发现 DOC 浓度与微生物群落结构优势种变化之间存在显著相关性(p <0.05)。例如,随着 DOC 浓度的降低,hgcl_clade 和 CL500-29_marine_group 的丰度增加。因此,尽管持续降水可能不会明显改变水质,但仍可能带来潜在的微生物风险。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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