Lignin phenols and BIT index distributions in the Amur River and the Sea of Okhotsk: Implications for the source and transport of particulate terrestrial organic matter to the ocean

Seki, Osamu; Mikami, Yuzuru; Nagao, Seiya; Bendle, James; Nakatsuka, Takeshi; Kim, V. I.; Шестеркин, В. П.; Makinov, A. N.; Fukushima, Masami; Moossen, Heiko; Schouten, Stefan

doi:10.1016/j.pocean.2014.05.003

Cited by 18 publications

(15 citation statements)

References 48 publications

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“…Overall, there is a progressive decline of Ad/Al ratios in the order of O horizon > mineral soils > riverine POM. This is distinct from increasing or similar ranges of Ad/Al ratios from soils to sediments observed elsewhere [ Seki et al ., ; Tesi et al ., ; Winterfeld et al ., ], again highlighting the unique lignin characteristics in the Madre de Dios system, because lignin is highly oxidized in the surface soils in this setting.…”

Section: Resultsmentioning

confidence: 99%

“…This implies that the S/V ratio in the particulate phase is relatively conservative proxy of lignin source during the land‐ocean transfer. By contrast, there is a large offset in the C/V ratios between Peruvian Andes soils and riverine or marine samples in that the C/V ratio decreased significantly in the order of O horizon > mineral soils > riverine POM or DOM, reflecting preferential degradation of C phenols in the soil and during transit from soils to rivers [ Hedges et al ., ; Requejo et al ., ; Feng et al ., ; Seki et al ., ]. Upon entry into the aquatic environment, C phenols seem to be stabilized relative to V phenols as reflected by the relatively narrow range of C/V ratios.…”

Section: Resultsmentioning

confidence: 99%

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Source to sink: Evolution of lignin composition in the Madre de Dios River system with connection to the Amazon basin and offshore

et al. 2016

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While lignin geochemistry has been extensively investigated in the Amazon River, little is known about lignin distribution and dynamics within deep, stratified river channels or its transformations within soils prior to delivery to rivers. We characterized lignin phenols in soils, river particulate organic matter (POM), and dissolved organic matter (DOM) across a 4 km elevation gradient in the Madre de Dios River system, Peru, as well as in marine sediments to investigate the source‐to‐sink evolution of lignin. In soils, we found more oxidized lignin in organic horizons relative to mineral horizons. The oxidized lignin signature was maintained during transfer into rivers, and lignin was a relatively constant fraction of bulk organic carbon in soils and riverine POM. Lignin in DOM became increasingly oxidized downstream, indicating active transformation of dissolved lignin during transport, especially in the dry season. In contrast, POM accumulated undegraded lignin downstream during the wet season, suggesting that terrestrial input exceeded in‐river degradation. We discovered high concentrations of relatively undegraded lignin in POM at depth in the lower Madre de Dios River in both seasons, revealing a woody undercurrent for its transfer within these deep rivers. Our study of lignin evolution in the soil‐river‐ocean continuum highlights important seasonal and depth variations of river carbon components and their connection to soil carbon pools, providing new insights into fluvial carbon dynamics associated with the transfer of lignin biomarkers from source to sink.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Source to sink: Evolution of lignin composition in the Madre de Dios River system with connection to the Amazon basin and offshore

et al. 2016

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“…Both the fact that deciduous trees and conifers produce substantially different amounts of terpenoids relative to their total biomass and the different preservation potential of di-and triterpenoids introduce significant uncertainty in terpenoid-based reconstructions of the vegetation, with a likely bias towards conifers (Giri et al 2015). Still, the variability of di-and triterpenoid ratios Ratios of syringyl over vanillyl (S/V) and cinnamyl over vanillyl alcohol (C/V) can therefore be used to reconstruct, for example, changes in the supply of plant matter from conifers (gymnopsperms) or grasslands within the catchment of a depositional archive (Hedges and Mann 1979;Fuhrmann et al 2003;Hyodo et al 2017) or to trace the spatial distribution of terrestrial organic matter in marine sediments (Smith et al 2012;Seki et al 2014).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…The BIT index has been applied successfully in reconstructions of environmental change on a range of time J o u r n a l P r e -p r o o f scales (Cao et al 2017;Mayser et al 2017) and studies tracking the dispersal of terrestrial organic matter in the marine realm using marine surface sediments off major point sources, i.e. rivers with large terrestrial catchments (Smith et al 2012;Seki et al 2014). The approach assumes that brGDGTs are representative of soil organic matter and that iGDGT production in the waterbody does not vary to the same extent as soil organic matter supply.…”

Section: Molecular Indicators For the Supply Of Soil Organic Mattermentioning

confidence: 99%

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

Holtvoeth

Codilean

Lacey

et al. 2020

Earth-Science Reviews

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Understanding and quantifying the processes and geochemical cycles associated with catchment erosion, the development of soils and weathering horizons, and terrestrial habitat change beyond the scales of modern observations remain challenging. Such research, however, has become increasingly important to help predict future landscape change in light of increasing land use and rapid global warming. We herein review organic and inorganic geochemical tools applied to depositional archives to better understand various aspects of landscape evolution on geological time scales. We highlight the potentials and limitations of inorganic geochemical analytical methods, such as major element geochemistry, metal and radiogenic isotopes, and in-situ cosmogenic nuclides, as qualitative, semi-quantitative, and quantitative proxies for the transformation of bedrock material via regolith and soils to sediments. We also show how stable isotope geochemistry applied to lacustrine endogenic carbonates can be used to infer rock-water interactions, vegetation change, and soil development in limestone-rich catchments. Proxies focusing on the silicilastic element of sediment formation, transport and deposition are also ideally combined with organic geochemical proxies for vegetation change and soil organic matter evolution in a catchment to gain a comprehensive picture of the Critical Zone's evolution over time. Multi-proxy and multidisciplinary research combining organic and inorganic geochemical techniques from several sedimentary archives in the same catchment have high potential to provide comprehensive information on Quaternary landscape evolution and thus improve the robustness of associated forecasting models.

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“…This may include the differentiation of organic matter from allochthonous and autochthonous origins and dispersion of terrestrial matter along saline and/or estuarine gradients. Consequently, the oxidation products of lignin are potential biomarkers .…”

Section: Introductionmentioning

confidence: 99%

Solvent‐free method for the determination of lignin‐derived phenols in sediments

Pinto

Frena

Madureira

2017

J of Separation Science

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A solvent-free method that uses headspace solid-phase microextraction and gas chromatography with flame ionization detection is proposed for the determination of lignin-derived phenols in sediments. The extraction and derivatization conditions for the simultaneous analysis of acetosyringone, acetovanillone, syringaldehyde, vanillin, ferulic acid, syringic acid, vanillic acid, p-hydroxybenzoic acid, and p-coumaric acid were optimized using a central composite design. After optimization, the best results were obtained with the following conditions: exposure of the polyacrylate fiber to the headspace with 60 μL of N,O-bis(trimethylsilyl)trifluoroacetamide as a derivatizing agent for 15 min and then extraction in the headspace of 100 mg of sediment (previously spiked with lignin-derived phenols) for 35 min. The accuracy of the method was estimated based on recovery tests at two concentration levels and by comparison with a high-performance liquid chromatography method reported in the literature. Based on the t-test with a confidence level of 95%, no statistical differences were observed. The detection and quantification limits for the target compounds varied according to their characteristics: values at the microgram per gram level for nonacid compounds and milligram per gram level for phenolic acids, due to the lower volatility of the derivatives.

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Lignin phenols and BIT index distributions in the Amur River and the Sea of Okhotsk: Implications for the source and transport of particulate terrestrial organic matter to the ocean

Cited by 18 publications

References 48 publications

Source to sink: Evolution of lignin composition in the Madre de Dios River system with connection to the Amazon basin and offshore

Source to sink: Evolution of lignin composition in the Madre de Dios River system with connection to the Amazon basin and offshore

Geochemical methods to infer landscape response to Quaternary climate change and land use in depositional archives: A review

Solvent‐free method for the determination of lignin‐derived phenols in sediments

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