The molecular characteristics of dissolved organic matter in urbanized river sediments and their environmental impact under the action of microorganisms

Zhang, Li; Sun, Qingxuan; Dou, Quanhao; Lan, Shuang; Peng, Yongzhen; Yang, Jiachun

doi:10.1016/j.scitotenv.2022.154289

Cited by 34 publications

(13 citation statements)

References 51 publications

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“…Lipids, proteins, carbohydrates, and tannins are labile and bioavailable (Chen et al., 2018; Zhang et al., 2022). The molecular number of proteins ranged from 110 to 1,080, accounting for 2.7%–10.2% of the total.…”

Section: Resultsmentioning

confidence: 99%

The Spatial Distribution of Dissolved Organic Matter and Its Molecular Fingerprints in Seasonal Snow Over Northeastern China

Wen

et al. 2023

JGR Atmospheres

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Snow cover is an essential sink of dissolved organic matter (DOM), directly affecting the carbon cycle (Antony et al., 2014). DOM related to microbes and the bioavailability may determine whether snow and ice are a net sink or source of CO 2 (Stibal et al., 2012). DOM released from snow/glacial runoff is an important source of labile reduced carbon to marine ecosystems, changing the age, quantity, and reactivity of DOM in coastal regions (Hood et al., 2009). Furthermore, snow cover reflects most sunlight, with reduced transmission due to the small size of snow grains and a multitude of air/ice interfaces (Perovich, 2007). DOM directly absorbs photons in the ultraviolet-visible region, changing the radiation balance of the snowpack, warming the atmosphere, and reducing snow albedo (Flanner et al., 2009;Grannas et al., 2007). DOM also plays an important role in producing reactive species and snow grains may also be conducive to enhance such process, more rapidly in frozen than liquid water states (Grannas et al., 2014). In addition to releasing reactive species, DOM, such as plant vascular material, is also involved in the photochemical production of CH 2 O and CH 3 CHO in snow (Grannas et al., 2004). Overall, above observations highlight the importance of the synergistic effects of snow and DOM.

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Section: Resultsmentioning

confidence: 99%

The Spatial Distribution of Dissolved Organic Matter and Its Molecular Fingerprints in Seasonal Snow Over Northeastern China

Wen

et al. 2023

JGR Atmospheres

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“…Moreover, Deltaproteobacteria is more widely distributed in freshwater sediments, which is because reduction by sulfates, plays key roles in sulfur circulation of sediments 28,29 . Anaerolineae belonging to Chloroflexales can biodegrade organic pollutants 30 , so the relatively higher abundance of Anaerolineae in sediments of DH reflects the higher concentrations of organic pollutants. Bacteroidia (32.12% ± 1.32%) and Clostridia (21.98% ± 0.90%) contribute to over 50% of bacteria in sediments from ZH.…”

Section: Discussionmentioning

confidence: 99%

Bacterial diversity in surface sediments of collapsed lakes in Huaibei, China

Shen

Shang

Wang

et al. 2022

Sci Rep

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The collapse lake area due to coal mining in Huaibei shows high biodiversity, but the bacterial community composition and diversity in the lake sediments are still rarely studied. Therefore, based on 16S rRNA high-throughput sequencing and combined with analysis of environmental factors, we comparatively analyzed the bacterial community composition and diversity of surface sediments from East Lake (DH) and South Lake (NH) and Middle Lake (ZH) in the collapse lake area of Huaibei. The bacterial community compositions are significantly different in the sediments among Huaibei collapsed lakes, with DH having the largest number of species, and NH having a higher species diversity. Pseudomonadota is the most abundant phylum in the sediments of DH and NH, while the most abundant phyla in ZH are Bacteroidales, Chloroflexales, Acidobacteriales, and Firmicutes. Anaerolineae (24.05% ± 0.20%) is the most abundant class in the DH sediments, and Gammaproteobacteria (25.94% ± 0.40%) dominates the NH sediments, Bacteroidia (32.12% ± 1.32%) and Clostridia (21.98% ± 0.90%) contribute more than 50% to the bacteria in the sediments of ZH. Redundancy analysis (RDA) shows that pH, TN, and TP are the main environmental factors affecting the bacterial community composition in the sediments of the collapsed lake area. The results reveal the bacterial community composition and biodiversity in the sediments of the Huaibei coal mining collapsed lakes, and provide new insights for the subsequent ecological conservation and restoration of the coal mining collapsed lakes.

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“…Bacteria produce, transform or breakdown labile DOM (Zhu et al, 2022). Anaerolinea, for example, has the potential to release lignin-like DOM associated with DOM hydrolysis and acidi cation (Zhang et al, 2022). Pseudomonas is able to use various organic materials for transformation and exhibits a high degradation e ciency for a wide range of aromatic compounds (Dong et al, 2019;Chen et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Salinity fluctuations in a brackish-water lake influence the dissolved organic matter characteristics of pore water

Xie

Zuo

et al. 2023

Preprint

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The dissolved organic matter (DOM) compositions in lake water have been widely studied; however, it is not clear how salinity fluctuations in brackish lakes with reeds affect DOM transformation in pore water. This experiment included three salinity groups (1,200 mg/L, 3,600 mg/L, and 6,000 mg/L) to research the interactions between bacteria and DOM in sediments under a salinity gradient. The results showed that higher salinity reduced the Fmax of protein-like substances and resulted in DOM becoming more aromatic and endogenous. Salinity affected DOM compositions due to the responses of functional bacterial communities. Thiobacillus was salt-tolerant and dominated in the sediments, the relative abundances of which were negatively correlated with the Fmax of the protein-like components. The relative abundance of Flavobacterium showed a positive correlation with salinity and a negative correlation with the Fmax of fulvic acid-like and tryptophan-like components. Pseudomonas showed negative correlations with salinity and the Fmax of fulvic acid-like substances and a positive correlation with the Fmax of protein-like substances. Higher salinity inhibited the tryptophan degradation metabolic pathway and enhanced tryptophan biosynthesis. In addition, higher salinity simultaneously inhibited tyrosine biosynthesis and metabolism pathways. The results of this study may provide a new idea for understanding DOM cycling in brackish lake and organic pollution management.

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The molecular characteristics of dissolved organic matter in urbanized river sediments and their environmental impact under the action of microorganisms

Cited by 34 publications

References 51 publications

The Spatial Distribution of Dissolved Organic Matter and Its Molecular Fingerprints in Seasonal Snow Over Northeastern China

The Spatial Distribution of Dissolved Organic Matter and Its Molecular Fingerprints in Seasonal Snow Over Northeastern China

Bacterial diversity in surface sediments of collapsed lakes in Huaibei, China

Salinity fluctuations in a brackish-water lake influence the dissolved organic matter characteristics of pore water

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