Delivery and deposition of organic matter in surface sediments of Lagoa do Caçó (Brazil)

Sifeddine, Abdelfettah; Meyers, Philip A.; Cordeiro, Renato Campello; Albuquerque, Ana Luíza Spadano; Bernardes, Marcelo; Turcq, Bruno; Abrão, Jorge João

doi:10.1007/s10933-011-9506-0

Cited by 35 publications

(20 citation statements)

References 21 publications

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“…A number of studies have demonstrated that TOC in small and shallow lakes is attributable to allochthonous sources but TOC in larger and deeper lakes to autochthonous sources that are derived from planktonic organisms (Shanahan et al, 2013;Sifeddine et al, 2011;Barnes and Barnes, 1978). Our analyses showed that the majority of TOC was autochthonous in the surface sediment of Bosten Lake.…”

Section: Discussionmentioning

confidence: 58%

“…The magnitudes and spatial distribution of TOC in lake sediment may reflect multiple, complex processes (Sifeddine et al, 2011;Woszczyk et al, 2011;Dunn et al, 2008;Wang et al, 2012). Our analyses showed a significant negative relationship between the δ 13 C org value and water depth (Table 1), implying that the shallow sections in Bosten Lake accumulated more allochthonous TOC (with less negative δ 13 C).…”

Section: Discussionmentioning

confidence: 73%

“…In general, lakes with high productivity have more autochthonous TOC, but lakes with low productivity mainly allochthonous TOC (Dean and Gorham, 1998). There is evidence of littoral sources of TOC in small and shallow lakes but autochthonous sources, derived from planktonic organisms, in larger and deeper lakes, especially fjord lakes (Shanahan et al, 2013;Sifeddine et al, 2011;Barnes and Barnes, 1978).…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that there are large differences in C : N ratio and 13 C org value between exogenous and endogenous organic materials (Brodie et al, 2011;Kaushal and Binford, 1999). For example, aqueous organic matter has low C : N ratios (4-10) (Meyers, 2003) whereas vascular land plants have much higher C : N ratios (> 20) (Rumolo et al, 2011;Lamb et al, 2004;Sifeddine et al, 2011). On the other hand, due to the difference in isotopic fractionation during photosynthesis, δ 13 C org value is more negative (ranging from −33 to −22 ‰) in terrestrial C 3 plants (Pancost and Boot, 2004;Wang et al, 2013) and lake plankton (Bertrand et al, 2010;Vuorio et al, 2006) than in C 4 plants (ranging from −16 to −9 ‰) (Pancost and Boot, 2004;Wang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Wang

Zhang

et al. 2015

Biogeosciences

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Abstract. Lake sediment is an important carbon reservoir. However, little is known on the dynamics and sources of sediment organic carbon in Bosten Lake. We collected 13 surface (0-2 cm) sediment samples in Bosten Lake and analyzed total organic carbon (TOC), total nitrogen (TN), stable carbon isotopic composition in TOC (δ 13 C org ), and grain size. We found a large spatial variability in TOC content (1.8-4.4 %) and δ 13 C org value (−26.77 to −23.98 ‰). Using a three-end-member mixing model with measured TOC : TN ratio and δ 13 C org , we estimated that 54-90 % of TOC was from autochthonous sources. Higher TOC content (> 3.7 %) was found in the east and central-north sections and near the mouth of the Kaidu River, which was attributable to allochthonous, autochthonous plus allochthonous, and autochthonous sources, respectively. The lowest TOC content was found in the mid-west section, which might be a result of high kinetic energy levels. Our study indicated that the spatial distribution of sediment TOC in the Bosten Lake was influenced by multiple and complex processes.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Wang

Zhang

et al. 2015

Biogeosciences

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“…In some small lakes, the spatial distribution of sedimentary organic matter is relatively simple, owing to one factor showing the greatest effect [48]. However, in some large lakes, the spatial distribution is complicated owing to multifactors interacting with each other.…”

Section: Influence Factors and Paleolimnological Significancementioning

confidence: 99%

The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

et al. 2012

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In this study, 67 surface sediment samples collected from Nam Co in central Tibet were analyzed for total carbon, total organic carbon and total nitrogen, and 51 of these samples were also analyzed for n-alkanes. The origin and spatial distribution of organic matter were then investigated using these proxies, and the control factors responsible for the spatial distribution patterns and paleolimnological significance were discussed. The results indicated that the origin of organic matter in surface sediment of Nam Co is consistent with the sources of n-alkanes, which were primarily submerged plants, followed by terrestrial plants, and then aquatic algae and bacteria. The organic matter in surface sediments of the lake showed typical spatial variability. Because of the great influence of underwater topography, river inputs and water quality, the spatial distribution of organic matter is enriched from the source to the deposit center. This spatial variability of organic matter in the lake indicates that the sediments in different areas have different sensitivities to environmental changes, which is important to reconstruction of paleoenvironments and paleoclimate using lake sediment cores.Tibetan Plateau, Nam Co, surface sediments, spatial distribution, sedimentary processes Citation:Wang Y, Zhu L P, Wang J B, et al. The spatial distribution and sedimentary processes of organic matter in surface sediments

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Paleoenvironmental dynamics in central‐eastern Brazil during the last 23 000 years: tropical peatland record in the Cerrado biome

Costa

Luz

Horák‐Terra

et al. 2022

J Quaternary Science

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The Cerrado biome is the second largest in Brazil, but the evolution of the Cerrado during the late Quaternary is not yet fully known. This study identifies paleoenvironmental changes during the last 23 000 years, based on a tropical mountain peatland record, in the Serra do Espinhaço Meridional in central-eastern Brazil. A multi-proxy approach was used that involved palynological analysis, stable isotopes (δ 13 C, δ 15 N), geochemistry, radiocarbon dating and multivariate statistics derived from a peatland core from Rio Preto (Minas Gerais state). The study reveals a very humid and cold climate during the late Pleistocene, with an increase in temperature and decrease in humidity at the Pleistocene-Holocene transition. During this period there was strong instability in the landscape (episodes of erosion). At the beginning of the Holocene there was a reduction in humidity with greater landscape stability. The current sub-humid climatic conditions seem to have been established in the mid-/late Holocene, with periods of landscape instability. Our findings agree with other Cerrado records that contradict previously established hypotheses, such as the Amazonian Refuge and the Pleistocene Arc.

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Delivery and deposition of organic matter in surface sediments of Lagoa do Caçó (Brazil)

Cited by 35 publications

References 21 publications

Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

Spatial distribution and sources of organic carbon in the surface sediment of Bosten Lake, China

The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau

Paleoenvironmental dynamics in central‐eastern Brazil during the last 23 000 years: tropical peatland record in the Cerrado biome

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