Effects of water quality and bacterial community composition on dissolved organic matter structure in Daihai lake and the mechanisms

Gao, Jiayue; Feng, Weiying; Yang, Fang; Liu, Jing; Fan, Wenhong; Wang, Ying; Zhang, Qi; Yang, Wenhuan

doi:10.1016/j.envres.2022.114109

Cited by 25 publications

(9 citation statements)

References 51 publications

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“…Saline lakes are highly sensitive to environmental changes, and climate change is expected to further exacerbate these effects ( Gao et al, 2022 ). As an essential member of ecosystem, microorganisms are particularly important as they are the primary drivers of various biogeochemical processes ( Li et al, 2023 ), such as nutrient cycling, energy transfer ( Xie et al, 2022 ), carbon fixation ( Berg et al, 2010 ; Hugler and Sievert, 2011 ; Xiao et al, 2023 ), and sulfur metabolism ( Anantharaman et al, 2018 ; Zorz et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

“…The microbial community assembly in Barkol Saline Lake ecosystems was predominantly shaped by deterministic processes. This means that the composition and structure of the microbial communities were mainly influenced by environmental factors and niche selection ( Gao et al, 2022 ). However, at the boundary area between the sediment and degraded areas, the community assembly seemed to be undergoing a stochastic process, which implies that random factors, such as dispersal and chance events were important.…”

Section: Discussionmentioning

confidence: 99%

“…It revealed that the concentration of major ions exhibited a decreasing trend after lake degradation. This indicates that the overall concentration of salt ions decreases as the lake degrades, which will eventually lead to a decrease in total salinity and inevitably change the corresponding microbial groups in this habitat ( Gao et al, 2022 ). The co-occurrence network patterns revealed that the complexity of microbial community in the Barkol Saline Lake habitat was: all>sediment>degraded area.…”

Section: Discussionmentioning

confidence: 99%

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Response of microbial diversity and function to the degradation of Barkol Saline Lake

Liu,

Gao,

Jiang

et al. 2024

Front. Microbiol.

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Barkol Lake, a shrinking hypersaline lake situated in the northeast of Xinjiang, China, has experienced the exposure of its riverbed and the gradual drying up of its original sediment due to climate change and human activities, resulting in the formation of alkaline soils. These changes have correspondingly altered the physicochemical characteristics of the surrounding environment. Microorganisms play a crucial role, with special functioning involved in various nutrient cycling and energy transfer in saline lake environments. However, little is known about how the microbial community dynamics and metabolic functions in this shrinking saline lake relate to the degradation process. To address this knowledge gap, a cultivation-independent method of amplicon sequencing was used to identify and analyze the microbial community and its potential ecological functions in the sediment and degraded area. The microbial community diversity was found to be significantly lower in the degraded areas than in the sediment samples. The Pseudomonadota was dominant in Barkol Saline Lake. The abundance of Desulfobacterota and Bacillota in the degraded areas was lower than in the lake sediment, while Pseudomonadota, Acidobacteriota, and Actinobacteriota showed an opposite trend. The βNTI showed that microbial community assembly was primarily associated with deterministic processes in Barkol Saline Lake ecosystems and stochastic processes at the boundary between sediment and degraded areas. Functional predictions showed that sulfur metabolism, particularly sulfate respiration, was much higher in sediment samples than in the degraded areas. Overall, these findings provided a possible perspective for us to understand how microorganisms adapt to extreme environments and their role in saline lakes under environmental change.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Response of microbial diversity and function to the degradation of Barkol Saline Lake

Liu,

Gao,

Jiang

et al. 2024

Front. Microbiol.

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“…Solar radiation during drought periods accelerates DOM humi cation (del Campo et al, 2019), and rewetting initiated anaerobic microbial respiration, transferred electrons to DOM (Lau et al, 2015). In addition, the drought-rewetting process has been proven to in uence bacterial communities, a key factor related to quality and quantity of DOM (Gao et al, 2022). Bacterial communities participate constantly in supply and depletion of DOM, which regulates DOM concentration and composition via degradation, absorption, metabolic transformation, and secretion (Xu et al, 2020a;Osterholz et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Dissolved organic matter (DOM) is ubiquitous in natural waters and plays a fundamental role in biogeochemical processes of lakes (Singh et al, 2017), such as cycling of carbon, nitrogen, and phosphorous (Li et al, 2020), fate of organic pollutants and trace metals (Yan and Korshin, 2014), and growth of benthic algae or bacteria (Liu et al, 2021;Gao et al, 2022). Concentrations of DOM in sediment pore water are normally orders of magnitude higher than those in overlying water, serving as an important source of DOM input into water column, especially in shallow lakes (Zhu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effects of drought-rewetting process and salinity variations on DOM transformation and bacterial communities in lacustrine sediments

Zhu

Xie

et al. 2023

Preprint

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Climate change and anthropogenic activities cause salinity fluctuations and frequent drought-rewetting process in lacustrine littoral zones. However, joint effects of these processes on quality and quantity of dissolved organic matter (DOM) in pore water and bacterial communities in sediments are not well understood. An experiment was conducted to attempt to fill the above gaps, the results showed that the joint effects of higher salinity (6,000 mg/L) and drought-rewetting process were to retain more humified, more aromatic, and less bioavailable DOM, and to maintain lower DOM concentrations in pore water. The drought-rewetting process magnified influence of salinity on bacterial communities. Before the drought-rewetting process, Hydrogenophilaceae, Oxalobacteraceae, and Flavobacteriaceae participated in the DOM transformation, while Hydrogenophilaceae, Desulfobacteraceae, Anaerolineacea, Planococcaceae, and Clostridiaceae were associated with DOM components after this process. The drought-rewetting process greatly increased significant positive correlations (P<0.05) among bacteria, which was consistent with Stress Gradient Hypothesis and destabilized the bacterial communities. Higher (6,000 mg/L) or lower (1,200 mg/L) salinity were all not conducive to stability of bacterial communities in Shahu Lake. The results of this study may provide ideas for further investigating DOM transformation and cycling in brackish-water lakes.

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Effects of drought-rewetting processes and salinity variations on dissolved organic matter (DOM) transformation and bacterial communities in lacustrine sediments

Zhu

Xie

et al. 2023

J Soils Sediments

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Effects of water quality and bacterial community composition on dissolved organic matter structure in Daihai lake and the mechanisms

Cited by 25 publications

References 51 publications

Response of microbial diversity and function to the degradation of Barkol Saline Lake

Response of microbial diversity and function to the degradation of Barkol Saline Lake

Effects of drought-rewetting process and salinity variations on DOM transformation and bacterial communities in lacustrine sediments

Effects of drought-rewetting processes and salinity variations on dissolved organic matter (DOM) transformation and bacterial communities in lacustrine sediments

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