Linkages between greenhouse gases (CO2, CH4, and N2O) and dissolved organic matter composition in a shallow estuary

Amaral, Valentina; Ortega, T.; Romera‐Castillo, Cristina; Forja, Jesús M.

doi:10.1016/j.scitotenv.2021.147863

Cited by 76 publications

(26 citation statements)

References 105 publications

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“…C3 had two Ex maxima at 245 and 330 nm and one Em maximum at 412 nm, similar to the microbial humic-like component (C1 in [ 41 ]; C2 in [ 42 ]). C4 had Ex/Em maxima at (240, 285)/342 nm, which resembled the tryptophan-like component (C5 in [ 43 ]; C4 in [ 44 ]).…”

Section: Resultsmentioning

confidence: 99%

Effects of Photodegradation on the Optical Indices of Chromophoric Dissolved Organic Matter from Typical Sources

Zhuang

Chen

Yang

2022

IJERPH

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Chromophoric dissolved organic matter (CDOM) plays important roles in aquatic environments, and its optical properties provide a series of indices for evaluating the source and composition of dissolved organic matter (DOM). However, little is known about the varying photodegradation of CDOM from different sources and the effects on the optical indices of DOM composition. This was studied for typical natural and anthropogenic sources (plant and leaf litter leachates, the influent and effluent of a wastewater treatment plant, and a river). The CDOM absorption (a280) showed a lower degradability for the plant leachate than other sources, mainly due to its low molecular weight and aromaticity. Four fluorescent components were identified with excitation–emission matrices-parallel factor analysis (EEMs-PARAFAC), namely benzoic acid/monolignol-like C1, humic-like C2 and C3, and tryptophan-like C4. The plant leachate contained mainly C1, which was photodegraded moderately, while other sources had more C2 and C3 with higher photodegradability. C4 was photodegraded in most sources but was photoproduced in the leaf litter leachate. The absorption slope (S275–295) and slope ratio (SR) increased while the humification index (HIX) decreased, suggesting a decreasing molecular weight and humic content by photodegradation. This was consistent with the decreasing %C2 and %C3 but increasing %C4, which indicated preferential removal of humic-like components. The %C1, %C2, biological index (BIX), and fluorescence index (FI) were less affected by photodegradation than other indices for most sources. These results have implications for a better understanding of the photochemistry of CDOM and the applications of optical indices.

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Section: Resultsmentioning

confidence: 99%

Effects of Photodegradation on the Optical Indices of Chromophoric Dissolved Organic Matter from Typical Sources

Zhuang

Chen

Yang

2022

IJERPH

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“…In lakes, positive correlations of DON, inorganic nitrogen (NO 3 − -N and NH 4 + -N), and DOC have been observed, especially the significantly positive correlations between NO 3 − -N and DON (R = 0.84, p < 0.01) ( Figure 4 ). Generally, higher temperatures and carbon/nitrogen inputs relatively encouraged microbial activities and influenced the contributions of p CO 2 in river ecosystems [ 8 , 12 , 25 ]. Nutrient supplementation was also verified as an important factor influencing p CO 2 by enhancing the primary production and mineralization of organic matter [ 39 , 40 , 41 ].…”

Section: Discussionmentioning

confidence: 99%

“…Owing to the enormous challenges of carbon assessment and environmental management in the global ecosystem, CO 2 emissions from river networks have inspired great interest around the world. Therefore, much efforts have been made to assess the contributions of CO 2 emissions from natural river ecosystems, e.g., Amazon and Mekong River systems [ 7 ], Guadalete River [ 8 ], and the Wujiang River [ 9 ]. However, urban river networks are intensively impacted by anthropogenic activities (e.g., sewage draining and urban land coverages) compared with those of natural river networks, which generally exhibit more complex watershed environmental conditions dominating the production and transportation of CO 2 [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Mechanisms of CO 2 emissions from river ecosystems are associated with a combination of internal factors (temperature, pH, dissolved oxygen, and organic matters) and external factors (geomorphology, hydrology, precipitation, and anthropogenic activities) [ 8 , 12 ], which are further impacted by autotrophic and heterotrophic microbial activities in waters, photosynthesis of aquatic vegetation, organic matter degradation, and mineralization [ 13 ]. The drastic disturbance in urban river networks commonly expressing low dissolved oxygen (DO) and high nutrient or organic carbon concentration is closely related to the higher partial pressure of carbon dioxide ( p CO 2 ) levels than rivers in less impacted areas.…”

Section: Introductionmentioning

confidence: 99%

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The Impacts of Nitrogen Pollution and Urbanization on the Carbon Dioxide Emission from Sewage-Draining River Networks

Hou

Liu

Han

et al. 2022

IJERPH

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Carbon dioxide (CO2) emissions from river water have sparked worldwide concerns due to supersaturate CO2 levels in the majority of global rivers, while the knowledge on the associations among nitrogen pollution, urbanization, and CO2 emissions is still limited. In this study, the CO2 partial pressure (pCO2), carbon and nitrogen species, and water parameters in sewage-draining river networks were investigated. Extremely high pCO2 levels were observed in sewage and drainage river waters, such as Longfeng River, Beijing-drainage River, and Beitang-drainage River, which were approximately 4 times higher than the averaged pCO2 in worldwide rivers. Correlations of carbon/nitrogen species and pCO2 indicated that carbon dioxide in rural rivers and sewage waters primarily originated from soil aeration zones and biological processes of organic carbon/nitrogen input from drainage waters, while that in urban rivers and lakes was mainly dominated by organic matter degradation and biological respiration. Enhanced internal primary productivity played critical roles in absorbing CO2 by photosynthesis in some unsaturated pCO2 sampling sites. Additionally, higher pCO2 levels have been observed with higher NH4+-N and lower DO. CO2 fluxes in sewage waters exhibited extremely high levels compared with those of natural rivers. The results could provide implications for assessing CO2 emissions in diverse waters and fulfilling water management polices when considering water contamination under intense anthropogenic activities.

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“…According to the Ex|Em wavelengths, C1 and C2 represent humic-like fluorescent components originating from autochthonous production (Gao and Gueǵuen, 2018;Kulkarni et al, 2018). C3 represents an autochthonous protein-like component (Bittar et al, 2015), and C4 represents humic-like fluorescent components originating from microbial degradation (Amaral et al, 2021). All components had different dynamic variations in fluorescence intensity during the 120-day degradation process (Figure 2).…”

Section: Variation In Doc Components During the 120-day Degradation E...mentioning

confidence: 99%

The interaction between DOC released by cultured kelp (Saccharina japonica) and the bacterial community reveals the potential for increasing marine carbon sequestration by macroalgae culture

Zhang

Qin²,

Wang³

et al. 2022

Front. Mar. Sci.

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Macroalgae culture as a marine carbon sequestration strategy has been recently proposed. To understand the potential for carbon sequestration by macroalgae culture, we studied the interaction of dissolved organic carbon (DOC) released by Saccharina japonica, an important cultured kelp species in China, and the bacterial community. We found that S. japonica effectively released DOC containing both labile and refractory components, and the DOC released by S. japonica into the water decreased average molecular weight (Masswa) by 18 Da, meaning it was rich in low molecular weight matter. Degradation of labile DOC components occurred during the initial 2 months of the experiment. The Masswa and molecular diversity of the DOC was increased in turn by bacterial degradation, and the variation in the DOC composition resulted in the succession of the bacterial community. During labile DOC degradation, anaerobic Gammaproteobacteria, Bacteroidia and Campylobacteria were the dominant microbial classes in the water, and aerobic Iodidimonadaceae became the dominant family during the final stage of the experiment. Finally, 5% of the DOC was transformed into refractory DOC. Although the sinking biomass was not involved in the study, the produced refractory DOC through the interaction between releasing DOC and bacterial degradation indicates a potential of carbon sequestration by macroalgae culture.

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Linkages between greenhouse gases (CO2, CH4, and N2O) and dissolved organic matter composition in a shallow estuary

Cited by 76 publications

References 105 publications

Effects of Photodegradation on the Optical Indices of Chromophoric Dissolved Organic Matter from Typical Sources

Effects of Photodegradation on the Optical Indices of Chromophoric Dissolved Organic Matter from Typical Sources

The Impacts of Nitrogen Pollution and Urbanization on the Carbon Dioxide Emission from Sewage-Draining River Networks

The interaction between DOC released by cultured kelp (Saccharina japonica) and the bacterial community reveals the potential for increasing marine carbon sequestration by macroalgae culture

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