How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum

Zhou, Yongqiang; Yao, Xiaolong; Zhou, Lei; Zhao, Zhonghua; Wang, Xiaolong; Jang, Kyoung‐Soon; Tian, Wei; Zhang, Yunlin; Podgorski, David C.; Spencer, Robert G. M.; Kothawala, Dolly N.; Wu, Fengchang

doi:10.1002/lno.11716

Cited by 40 publications

(32 citation statements)

References 58 publications

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“…These sites were either positioned in shallow environments near islands or in the effluent of WWTPs. Streams affected by inputs of human sewage have been shown to possess a contrasting DOM composition characterized in part by higher proportions of highly labile microbial OM and low aromatic content (Petrone et al 2009; Williams et al 2016; Khamis et al 2018; Zhou et al 2021). Therefore, disproportionate inputs of protein‐rich DOM in areas with high influence of human activity could partly explain the high peaks in the concentrations of BDOC, but our data suggest that these inputs must also be coupled to specific environmental conditions (i.e., nutrients Fig.…”

Section: Discussionmentioning

confidence: 99%

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

Maisonneuve

Guillemette

Lapierre

2022

Limnology & Oceanography

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Large rivers are critical conduits from continents to oceans as they receive, produce and process huge amounts of dissolved organic matter (DOM). Yet, the relative influence of intrinsic DOM properties and extrinsic environmental properties on these processes at the ecosystem‐level is rarely studied. We assessed DOM optical properties as well as bioreactivity and photoreactivity at 40 sites along a >200 km transect of the freshwater portion of the St. Lawrence River through a series of standardized microbial incubations and exposure to simulated sunlight, and then estimated in situ areal rates of processing. We found that biological and photochemical processes preferentially targeted contrasting pools of DOM, but that DOM composition had an undiscernible effect on in situ degradation rates compared to other environmental factors. Total daily processing across the whole water column ranged from 36.7 to 892.1 mg C m−2. In situ photochemical degradation was largely driven by intrinsic DOM photoreactivity rather than environmental drivers in the water. In contrast, we found a relatively constant baseline pool of biolabile DOM that appeared to be independent from changes in concentration and environmental conditions. In situ DOM processing was mostly driven by biological degradation (on average 95%), and disproportionately high biodegradation rates (2.5–4x the average) were found in a few shallower sites near effluents or islands, potentially driven by local increases in nutrient concentration and in the proportion of protein‐like DOM. These results illustrate how DOM composition and degradability interact with ambient environmental and morphological properties to dictate an ecosystem‐level reactivity of DOM.

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Section: Discussionmentioning

confidence: 99%

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

Maisonneuve

Guillemette

Lapierre

2022

Limnology & Oceanography

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“…In this study, C1 and C2 were identified as terrigenous components, with C1 being most closely correlated to agricultural activities; C3 was identified as an endogenous component. Previous studies have indicated that increasing intensities of agricultural activities around lakes leads to increased input of terrigenous humus-like substances [ 44 , 45 ]. This was reflected in Baoan Lake and Daye Lake, which are surrounded by widely distributed agricultural areas, and whose total proportions of component C1 in the FDOM of sediments were 47.82% and 47.41%, respectively ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Dissolved Organic Matter in Sediments of Typical Lakes in Southeastern Hubei Province, China

et al. 2022

IJERPH

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This study aimed to reveal the distribution characteristics and sources of dissolved organic matter (DOM) in sediments of typical lakes in the southeastern of the Hubei province and provide a reference for pollution control of eutrophic lakes. The sediments of four typical lakes (Liangzi, Baoan, Daye, and Qingshan) in the southeastern of the Hubei Province were investigated in May 2019. Ultraviolet-visible (UV-Vis) absorption spectroscopy and excitation-emission matrixes characteristics of DOM were obtained by UV-Vis spectrophotometry and three-dimensional fluorescence spectroscopy. Moreover, the DOM fluorescence components were resolved by parallel factor analysis (PARAFAC). The results showed that: (1) The absorption coefficient a350 in surface sediments followed the order: Baoan Lake (16.99 ± 3.82 m−1) > Qingshan Lake (15.37 ± 3.8 m−1) > Liangzi Lake (12.54 ± 5.58 m−1) > Daye Lake (12.43 ± 1.43 m−1). Specifically, with increasing depth in the sediment cores, a350 increased and then gradually decreased in Daye Lake and Baoan Lake, but fluctuated in Liangzi Lake and Qingshan Lake with a roughly decreasing trend. (2) Two humic-like components (C1, C2) and one protein-like component (C3) were identified via PARAFAC. This analysis also showed that the surface sediment fluorescent dissolved organic matter (FDOM) was dominated by protein-like, while the sediment core FDOM was dominated by humic-like in Liangzi Lake. The proportion of humic-like in FDOM was higher than protein-like in surface sediments and sediment cores of Baoan, Daye, and Qingshan Lakes. (3) The DOM of surface sediments in the Liangzi Lake comprised mostly autochthonous components, mainly produced by the vital activities of aquatic organisms. The DOM of surface sediments in Baoan Lake and Qingshan Lake showed weak humic and moderate autochthonous characteristics. The humification of DOM in sediment cores of Liangzi, Baoan, and Qingshan Lakes gradually decreased from depth to the surface. The DOM in surface sediments of Daye Lake had strong humic and moderate autochthonous characteristics. (4) In general, the DOM of lake sediments in southeastern Hubei Province has dual-contribution characteristics representing terrigenous and endogenous sources. In the restoration and treatment of lake ecology, both internal and terrestrial pollution should be considered. At the same time, it is noteworthy that cyanobacteria depletion and aquatic residues caused potential internal pollution.

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“…Especially, a significant loss of aquatic habitats has occurred in most watersheds because of agricultural activities, urbanization, and dam constructions (Bao et al, 2015;Wagner et al, 2015;Riedel et al, 2016;Li et al, 2018a). Understanding the biogeochemical transformation of DOM across the fluvial networks will ultimately help predicting how anthropogenic influences may be altering DOM composition and turnover (Battin et al, 2008;Bao et al, 2015;Riedel et al, 2016;He et al, 2020;Zhou et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Koch et al, 2005;Hertkon et al, 2006;Kellerman et al, 2014;Wagner et al, 2015;Riedel et al, 2016;Bahureksa et al, 2021). Chemical signatures in large rivers mirror various DOM sources and transformations, such as photo-and microbial degradation, geomorphological and hydrological processes (Roth et al, 2013;Seidel et al, 2015;Wagner et al, 2015;Riedel et al, 2016;He et al, 2020;Zhou et al, 2021). An increasing number of studies emphasizes the role of human actives on the composition of riverine DOM.…”

Section: Introductionmentioning

confidence: 99%

Molecular Composition of Dissolved Organic Matter in the Changjiang (Yangtze River) – Imprints of Anthropogenic Impact

Koch

Wang

et al. 2022

Front. Mar. Sci.

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Understanding the biogeochemical transformation of dissolved organic matter (DOM) across fluvial networks will ultimately help to predict anthropogenic influences. To date, few studies have evaluated the anthropogenic impact on the spatial and temporal changes of DOM composition in large river systems. Here, FT-ICR-MS combined with excitation-emission matrix spectroscopy (EEMs) and biomarkers were applied to resolve chemical differences of DOM collected from the Changjiang basin at different hydrological and environmental conditions. PCA and cluster analysis illustrated that samples collected from lake systems and northern and southern tributaries differed from the two batches of main stream samples, particularly due to higher contribution of nitrogen and sulfur containing compounds. Correlation of land-use information along the tributaries with different PCA loadings indicated that agricultural, forest and wetland areas and wastewater discharge control the composition of DOM within these subregions. Higher heteroatom content (especially CHONx) in the low discharge period ( 2009) may be contributed by paddy soil leaching into groundwater. The relative peak magnitude of sulfur containing formulas was elevated during flood season (2010), which may be related to pollutions in areas of high population density. In addition, lignin phenol concentrations were higher in the flood season because of elevated soil erosion. Consequently, land use and human activities can strongly alter the quality and composition of DOM in watersheds flowing through densely populated regions, which may also impact or influence the riverine carbon flux in anthropogenically disturbed river systems.

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How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum

Cited by 40 publications

References 58 publications

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

Biological and photochemical reactivity of dissolved organic matter in a large temperate river

Characteristics of Dissolved Organic Matter in Sediments of Typical Lakes in Southeastern Hubei Province, China

Molecular Composition of Dissolved Organic Matter in the Changjiang (Yangtze River) – Imprints of Anthropogenic Impact

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