2017
DOI: 10.1002/2016jg003715
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Investigating molecular changes in organic matter composition in two Holocene lake‐sediment records from central Sweden using pyrolysis‐GC/MS

Abstract: Organic matter (OM) is a key component of lake sediments, affecting carbon, nutrient, and trace metal cycling at local and global scales. Yet little is known about long‐term (millennial) changes in OM composition due to the inherent chemical complexity arising from multiple OM sources and from secondary transformations. In this study we explore how the molecular composition of OM changes throughout the Holocene in two adjacent boreal lakes in central Sweden and compare molecular‐level information with conventi… Show more

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Cited by 17 publications
(27 citation statements)
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References 134 publications
(182 reference statements)
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“…3 and 4) were in the reported range for algae (diatom, green and brown algae) and/or macrophytes (e.g., Characeae) found in Lake Chungará (Pueyo et al, 2011). In addition, lignin oligomers [a specific proxy for higher plants (Meyers and Ishiwatari, 1993)] always occurred at low levels, whereas the ratio of N-compounds to carbohydrates [a proxy for algal vs plant OM (Bianchi and Canuel, 2011)] was high compared to sediment from boreal lakes [S.I.4, Table S3 - (Ninnes et al, 2017;Tolu et al, 2017)]. Both independent tracers confirm the hypothesis made by Pueyo et al (2011) based on the carbon:nitrogen ratio (C/N), on the dominance of algal OM as a source of organic matter (OM) for offshore sediment.…”
Section: A 2700 Years Calendar Of the Parinacota Eruptionsmentioning
confidence: 99%
See 1 more Smart Citation
“…3 and 4) were in the reported range for algae (diatom, green and brown algae) and/or macrophytes (e.g., Characeae) found in Lake Chungará (Pueyo et al, 2011). In addition, lignin oligomers [a specific proxy for higher plants (Meyers and Ishiwatari, 1993)] always occurred at low levels, whereas the ratio of N-compounds to carbohydrates [a proxy for algal vs plant OM (Bianchi and Canuel, 2011)] was high compared to sediment from boreal lakes [S.I.4, Table S3 - (Ninnes et al, 2017;Tolu et al, 2017)]. Both independent tracers confirm the hypothesis made by Pueyo et al (2011) based on the carbon:nitrogen ratio (C/N), on the dominance of algal OM as a source of organic matter (OM) for offshore sediment.…”
Section: A 2700 Years Calendar Of the Parinacota Eruptionsmentioning
confidence: 99%
“…Both, proteins and chlorophyll are typically found in larger quantities in algae than in plants, the plants being instead richer in carbohydrates and polysaccharides (Bianchi and Canuel, 2011). Moreover, the relative abundances or contents of proteins and chlorophyll in sediment have been shown to be good proxies of algal production when determined by Py-GC/MS (Peulvé et al, 1996;Ninnes et al, 2017;Tolu et al, 2017) or other methods (Michelutti et al, 2005;Ady and Patoine, 2016). While the abundances of proteins and chlorophyll declined, the abundance of (alkyl)pyrroles, which are indicators of degradation products of proteins, chlorophylls, and other aquatic organism Ncompounds (Damsté et al, 1992;Jokic et al, 2004;Schellekens et al, 2009;Tolu et al, 2017), remained stable or increased (S.I.4., Fig.…”
Section: A 2700 Years Calendar Of the Parinacota Eruptionsmentioning
confidence: 99%
“…The py-GC/MS analysis, peak integration and identification follow the method optimized by Tolu et al (2015), and is described in detail in Supplementary Material. The pyrolytic organic products used in this study include: (i) 16 lignin oligomers and 4 phenolic compounds described as biomarkers for terrestrial OM (Meyers and Ishiwatari, 1993); and (ii) 6 specific Py-products of chlorophyll (i.e., prist-1-ene, phytenes, and phytadienes; Nguyen et al, 2003), 6 specific Py-products of proteins (i.e., 2,5diketopiperazines; Fabbri et al, 2012) and 13 steroids described as biomarkers for algal OM (Ishiwatari et al, 1991;Nguyen et al, 2003;Ninnes et al, 2017;Tolu et al, 2017). Changes in their fluxes to the sediment were estimated by dividing their signal intensity (i.e., peak area) by the dry mass accumulation rate (DM-AR).…”
Section: Organic Biomarkersmentioning
confidence: 99%
“…Dredged sediments can improve soil health by adding organic matter (OM) and nutrients, lowering bulk density, and slightly increasing soil pH (Daniels et al., 2007; Darmody & Ruiz Diaz, 2017; Sigua et al., 2004). Dredged sediments can contain OM in the form of lignin oligomers, marine and terrestrial humic acids, chlorophylls, carbohydrates, and other compounds (Ninnes, et al., 2017; Zhou et al., 2016). Soil OM (SOM) has high surface area, provides C and energy to soil microorganisms, and provides nutrients for plants (Lal, 2006, 2016).…”
Section: Introductionmentioning
confidence: 99%