Impacts of long-term land use on terrestrial organic matter input to lakes based on lignin phenols in sediment records from a Swedish forest lake

Yang, Bingjie; Ljung, Karl; Nielsen, Anne Birgitte; Fahlgren, Elise; Hammarlund, Dan

doi:10.1016/j.scitotenv.2021.145517

Cited by 24 publications

(11 citation statements)

References 64 publications

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“…It is thus plausible to assume that humic freshwater microbes are highly adapted to utilize diverse carbon sources and have developed a vast arsenal of biochemical weathering agents to use recalcitrant carbon sources. To date, microbial decomposition of lignin has been studied in soils even at the molecular level [e.g., ( Pathan et al, 2017 ; Bhatnagar et al, 2018 )] and sediments [e.g., ( Song et al, 2019 ; Yang et al, 2021 )], but their decomposition and the role of different microbial groups in the decomposition process in freshwaters are weakly understood.…”

Section: Introductionmentioning

confidence: 99%

Decomposition rate and biochemical fate of carbon from natural polymers and microplastics in boreal lakes

et al. 2022

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Microbial mineralization of organic compounds is essential for carbon recycling in food webs. Microbes can decompose terrestrial recalcitrant and semi-recalcitrant polymers such as lignin and cellulose, which are precursors for humus formation. In addition to naturally occurring recalcitrant substrates, microplastics have been found in various aquatic environments. However, microbial utilization of lignin, hemicellulose, and microplastics as carbon sources in freshwaters and their biochemical fate and mineralization rate in freshwaters is poorly understood. To fill this knowledge gap, we investigated the biochemical fate and mineralization rates of several natural and synthetic polymer-derived carbon in clear and humic lake waters. We used stable isotope analysis to unravel the decomposition processes of different 13C-labeled substrates [polyethylene, polypropylene, polystyrene, lignin/hemicellulose, and leaves (Fagus sylvatica)]. We also used compound-specific isotope analysis and molecular biology to identify microbes associated with used substrates. Leaves and hemicellulose were rapidly decomposed compared to microplastics which were degraded slowly or below detection level. Furthermore, aromatic polystyrene was decomposed faster than aliphatic polyethylene and polypropylene. The major biochemical fate of decomposed substrate carbon was in microbial biomass. Bacteria were the main decomposers of all studied substrates, whereas fungal contribution was poor. Bacteria from the family Burkholderiaceae were identified as potential leaf and polystyrene decomposers, whereas polypropylene and polyethylene were not decomposed.

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Section: Introductionmentioning

confidence: 99%

Decomposition rate and biochemical fate of carbon from natural polymers and microplastics in boreal lakes

et al. 2022

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“…Short-lived erosion events can lead increased deposition of minerogenic and terrestrial organic matter causing lower carbon concentrations and higher C/N in lake sediments (e.g., Yang et al, 2021). It is possible that the peaks and variability observed in the cores from H49 and H78 can be explained by fluctuating erosion rates bringing in minerogenic and terrestrial organic matter (Figure 3).…”

Section: Evolution Of Carbon Accumulationmentioning

confidence: 99%

Organic Carbon Burial in Constructed Ponds in Southern Sweden

Ljung

Lin²

2023

Earth Sci. Syst. Soc.

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Small ponds constructed for nutrient retention, biodiversity conservation or recreation also store large amounts of carbon. The potential role of small ponds for carbon storage and greenhouse gas emissions have been highlighted both in the scientific literature and in management plans. The role of small ponds in the global carbon budget is likely significant, but the potential has not been fully explored. Here we present measurements of yearly sedimentary carbon accumulation and carbon stocks in six small, constructed and restored ponds in southern Sweden. The ponds were constructed or restored during the last 20 years primarily for nutrient retention. The sediment cores span the time from the construction of the ponds until today. The ponds had high carbon accumulation, with mean total carbon stocks in the top 6 cm of sediment of 836 g C m−2 and a yearly mean C accumulation rate of 152 g C m−2 yr−1. The total amount of restored wetlands within the restoration program studied here has a total area of 480 ha, and upscaling the carbon stocks to the whole area of restored ponds and wetlands gave a total carbon stock of 4.013 × 106 kg C in the top 6 cm of the sediments. If considering the potential increase of CO2 and CH4 from the ponds it is likely that the constructed ponds studied here are net carbon sources. We compared our results with published measurements of CO2 and CH4 emissions from small ponds in Sweden. This shows that the CO2 equivalent emissions could be between 1.8 and 37.5 times higher than the sedimentary carbon accumulation. Our data indicate that small constructed ponds are potential net carbon sources. Therefore, we suggest that using small, constructed, or restored ponds as carbon mitigation strategy must be done with caution, and the potential for increased methane emissions must be considered.

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“…Therefore, the investigation of water-extractable organic matter (WEOM) from sediment, a crucial component of DOM in sediments with characteristics of high activity and mobility and could be involved in various biogeochemical processes, has become an important component of organic matter quality assessment (Bahureksa et al, 2021;Zhang et al, 2021). For instance, environment context variation (e.g., urbanization and soil erosion) has been proved to be recorded in organic matter in sediments (Darrow et al, 2017;Garzon-Garcia et al, 2017;Yang et al, 2021), which would consequently be imprinted in the composition and sources of WEOM (Dzulkafli et al, 2021;Ni et al, 2021). Therefore, clarifying the dynamic of WEOM (e.g., quantity and quality) is critical to understanding the biogeochemical processes and carbon cycling mechanism in the aquatic ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Optical and molecular diversity of dissolved organic matter in sediments of the Daning and Shennong tributaries of the Three Gorges Reservoir

Wang

Fang²,

He³

et al. 2023

Front. Environ. Sci.

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Introduction: Damming significantly modifies the function of natural river networks and influences sediment dynamics with a reservoir’s operation. The dissolved organic matter (DOM) in reservoir sediments severely affects carbon flow from land to sea. However, the properties of DOM (e.g., quantity and quality) in reservoir sediments and their relationship with carbon cycling remain unclear as complex reservoir construction interrupts the environmental processes.Methods: This study characterizes the optical and molecular properties of sediment water-extractable organic matter (WEOM) in the Daning and Shennong tributaries of the world’s largest reservoir—the Three Gorges Reservoir (TGR)—by applying optical techniques and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS).Results and Discussion: We first assessed the link between light-absorbing components and the individual molecules in WEOM, which were significantly different than DOM in water and indicated that there might be an intrinsic variation between DOM in sediment and in water. Then, with the unique optical–molecular property linkage assessed, multiple sources (autochthonous and terrestrial) were identified, and a declining trend of terrestrial and recalcitrant WEOM was revealed from the tributaries upstream to downstream. Finally, through covariance analysis of the properties between WEOM and sediment particles, we demonstrated that the WEOM dynamic was most likely regulated by hydrologic sorting-induced particle size and mineral composition variations of sediment. Moreover, assessment between lability and WEOM molecular properties suggested that the WEOM dynamic likely contributes to carbon burial in the reservoir. This study emphasizes the influence of dam construction on organic matter accumulation and riverine carbon cycling.

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Impacts of long-term land use on terrestrial organic matter input to lakes based on lignin phenols in sediment records from a Swedish forest lake

Cited by 24 publications

References 64 publications

Decomposition rate and biochemical fate of carbon from natural polymers and microplastics in boreal lakes

Decomposition rate and biochemical fate of carbon from natural polymers and microplastics in boreal lakes

Organic Carbon Burial in Constructed Ponds in Southern Sweden

Optical and molecular diversity of dissolved organic matter in sediments of the Daning and Shennong tributaries of the Three Gorges Reservoir

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