Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments

Li, Shuaidong; Lu, Lingfeng; Wu, Yusheng; Zhao, Zhihui; Huang, Changchun; Huang, Tao; Ma, Xiaohua; Jiang, Quanliang

doi:10.1016/j.ecolind.2021.107500

Cited by 20 publications

(9 citation statements)

References 81 publications

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“…Previous studies of HIX in sediment porewaters have typically interpreted this index as a proxy for CDOM sources in the degrading sedimentary OM, with low values (e.g. <3) indicative of autochthonous or microbial material and high values (e.g >6) indicative of terrestrial humic matter (Chen et al, 2016;Li et al, 2021). Our values are generally higher than those reported in these studies, implying an overall more humic composition of the source material.…”

Section: Consequences Of the Shallow Sulfate-methane Transition Zone At Storfjärdencontrasting

confidence: 44%

Anthropogenic Inputs of Terrestrial Organic Matter Influence Carbon Loading and Methanogenesis in Coastal Baltic Sea Sediments

et al. 2021

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Coastal regions globally have experienced widespread anthropogenic eutrophication in recent decades. Loading of autochthonous carbon to coastal sediments enhances the demand for electron acceptors for microbial remineralization, often leading to rearrangement of the sediment diagenetic zonation and potentially enhancing fluxes of methane and hydrogen sulfide from the seafloor. However, the role of anthropogenic inputs of terrestrial organic matter (OMterr.) in modulating diagenesis in coastal sediments is often overlooked, despite being of potential importance in regions of land-use and industrial change. Here we present a dated 4-m sediment and porewater geochemistry record from a eutrophic coastal location in the northern Baltic Sea, to investigate sources of recent carbon loading and their impact on modern diagenetic processes. Based on an end-member mixing model of sediment N/C ratios, we observe that a significant fraction of the late-20th century carbon loading at this location was contributed by OMterr.. Furthermore, analysis of lignin in this material shows depleted ratios of syringyl/vanillyl (S/V) and cinnamyl/vanillyl (C/V) phenols, indicative of enhanced inputs of woody gymnosperm tissue likely from forest industries. The rapid loading of organic matter from combined terrestrial and autochthonous sources during the late 20th century has stimulated methanogenesis in the sediment column, and shoaled the sulfate-methane transition zone (SMTZ) to a depth of 5–20 cm. Optical parameters of colored dissolved organic matter confirm that OMterr. is actively degrading in the methanogenic layer, implying a role for this material in diagenetic processes. Porewater CH4, SO42− δ13C-DIC, and ∑S2− data suggest that the modern SMTZ is a broad zone in which organoclastic sulfate reduction, methanogenesis and anaerobic oxidation of methane (AOM) co-occur. However, fluxes of CH4 and SO42− show that rates of these processes are similar to other marine locations with a comparably shallow SMTZ. We suggest that the shallow depth of the modern SMTZ is the principal reason for high observed diffusive and ebullitive methane fluxes from sediments in this area. Our results highlight that anthropogenic activities lead to multiple pathways of carbon loading to coastal sediments, and that forest industry impacts on sedimentation in the northern Baltic Sea may be more widespread than previously acknowledged.

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Section: Consequences Of the Shallow Sulfate-methane Transition Zone At Storfjärdencontrasting

confidence: 44%

Anthropogenic Inputs of Terrestrial Organic Matter Influence Carbon Loading and Methanogenesis in Coastal Baltic Sea Sediments

et al. 2021

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“…The surface area of Lake Erhai is 252 km 2 , with a large volume of 2.72 × 10 9 m 3 , an average water depth of 10.8 m, and a residence time of 2.75 years. The water supply is mainly from precipitation and surface runoff, and 22 main rivers ow into the lake with an annual ux of 8.25 × 10 8 m 3 (Li et al 2021;Lin et al 2020). The major rivers entering the lake from the north are the Miju River (MJ), Luoshi River (LS) and Yong'an River (YA), accounting for 60% of the total water in ow.…”

Section: Site Description and Sample Collectionmentioning

confidence: 99%

“…In this context, Lake Erhai is located in this lake region, ranking as the seventh largest lake in China, and was selected to test our hypothesis. Previous studies have characterized CDOM abundance and composition in Lake Erhai (Li et al 2021;Li et al 2014;Zhao et al 2019), whereas the knowledge linking DOM sources and transformation to the evolution of lake eutrophication remains elusive (Zhang et al 2021). The main objectives of this study are to (1) investigate the spatial-temporal variations in CDOM abundance and composition in lake water and in owing rivers; (2) identify the DOM sources and their relative contributions via CDOM optical indices; and (3) explore the relationships between DOM production and transformation in the lake response to the evolution of trophic status.…”

Section: Introductionmentioning

confidence: 99%

Optical properties as indicators of in-lake dissolved organic matter components, sources and transformation

Zhang

Wang

et al. 2023

Preprint

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Dissolved organic matter (DOM) plays an essential role in the biogeochemical cycle of carbon (C) in inland lakes. Combining ultraviolet–visible (UV–vis) absorption and fluorescence spectroscopy–parallel factor analysis (PARAFAC), we examined spatial-temporal variations in chromophoric DOM (CDOM) composition and sources in Lake Erhai, the seventh largest lake in China. The results showed that dissolved organic carbon (DOC) concentrations were obviously higher in the wet season than in the dry season. The optical indices of lake DOM exhibited regular seasonal variability. Larger SR values presented in the wet season indicated strong photobleaching activity. Humic-like substances (C1 and C3) dominated the lake DOM in the dry season, while protein-like substances (C2) were abundant in the wet season. The proportion of autochthonous DOM exceeds 60% in the northern region of Lake Erhai owing to algal proliferation. Evident correlations between DOC and Chl a, BIX, and YFI supported that most lake DOM originate from the photosynthesis of phytoplankton in the eutrophic transitional lake. Autochthonous DOM was associated with DOC, Chl a, C2%, YFI, and BIX, whereas terrestrial DOM was closely linked to a254,a350, C3/C1% and HIX, based on principal component analysis (PCA) results. Higher HIX values for the inflowing river in comparison to lake water demonstrated the allochthonous characteristics of river DOM. High variability of the DOM sources, compositions, and dynamics were observed across the lake catchment as evidenced from the CDOM optical properties. These findings further underscore the significant role of in-lake autochthonous DOM in the global C cycle for inland lakes toward eutrophication.

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“…However, human activities such as garbage incineration (Mastral and Callén, 2000), fossil fuel combustion (Blumer and Youngblood, 1975;Ma et al, 2021b), and wood burning for household heating and cooking (Lima et al, 2005;Zhang et al, 2007) are generally considered to be the main source of PAHs entering the environment (Viguri et al, 2002). Lake sediment is an important source and sink of pollutants (Li et al, 2021). PAHs enter the lake aquatic ecosystem through various processes, such as urban and agricultural runoff, automobile exhaust emissions, and fossil fuel leakage (Rinawati et al, 2012;Wang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

One-century sedimentary record, sources, and ecological risk of polycyclic aromatic hydrocarbons in Dianchi Lake, China

Huang

et al. 2022

Environ Sci Pollut Res

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In this study, the sedimentary records, sources, and ecological risks of polycyclic aromatic hydrocarbons (PAHs) in Dianchi Lake were analyzed. The concentration ranges of ΣPAH 16 in the sediments of Dianchi Lake were 368-990 ng/g, with an average value of 572 ng/g, peaking in 1988. Economic development and rapid population growth, as well as the rapid growth of coal consumption, have a greater impact on the HMW PAHs than on the LMW PAHs in the sedimentary environment. The results of the diagnostic ratios and PCA model show that the main sources of PAHs were coal and biomass combustion, as well as fossil fuel combustion sources in individual years. The risk assessment results showed that the PAH concentrations in the sediment were within a safe range. In the past 100 years of sediment pore water, except for Phe, which reached chronic toxic pollution levels in some years, other 2-3 ring LMW PAHs have been within a safe range. With the development of industrialization and urbanization, the burning of fossil fuels such as coal and petroleum has increased, and some of the 4-6 ring HMW PAHs have reached chronic toxicity or even acute toxicity in the sediment pore water.

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Investigation on depth-dependent properties and benthic effluxes of dissolved organic matter (DOM) in pore water from plateau lake sediments

Cited by 20 publications

References 81 publications

Anthropogenic Inputs of Terrestrial Organic Matter Influence Carbon Loading and Methanogenesis in Coastal Baltic Sea Sediments

Anthropogenic Inputs of Terrestrial Organic Matter Influence Carbon Loading and Methanogenesis in Coastal Baltic Sea Sediments

Optical properties as indicators of in-lake dissolved organic matter components, sources and transformation

One-century sedimentary record, sources, and ecological risk of polycyclic aromatic hydrocarbons in Dianchi Lake, China

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