The spatial distribution and sedimentary processes of organic matter in surface sediments of Nam Co, Central Tibetan Plateau
TLDR
In this paper, 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.Abstract:
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.read more
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Effects of natural factors on the spatial distribution of heavy metals in soils surrounding mining regions.
TL;DR: An 8km buffer zone surrounding a typical non-ferrous metal mine in Suxian District of Hunan Province, China, was selected as the study area and statistical, spatial autocorrelation and spatial interpolation analyses were used to obtain descriptive statistics and spatial autOCorrelation characteristics of As, Pb, Cu, and Zn in soil.
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Use of multi-proxy approaches to determine the origin and depositional processes in modern lacustrine sediments: Carajás Plateau, Southeastern Amazon, Brazil
Prafulla Kumar Sahoo,Pedro Walfir M. Souza-Filho,José Tasso Felix Guimarães,Marcio Sousa da Silva,Francisco Costa,Carmem-Lara de Oliveira Manes,Douglas Oti,Renato Oliveira da Silva Júnior,Roberto Dall'Agnol +8 more
TL;DR: In this paper, the authors investigated the geochemical and isotopic compositions of surficial sediments from a plateau lake in Carajas, Southeastern Amazon region, to understand the spatial distribution of major and trace elements, δ13C, Δ15N, and C/N ratio, depositional processes, and the origin of inorganic and organic fractions.
Journal ArticleDOI
Interplay between redox conditions and hydrological changes in sediments from Lake Nam Co (Tibetan Plateau) during the past 4000 cal BP inferred from geochemical and micropaleontological analyses
Thomas Kasper,Peter Frenzel,Torsten Haberzettl,Anja Schwarz,Gerhard Daut,Stephanie Meschner,Junbo Wang,Liping Zhu,Roland Mäusbacher +8 more
TL;DR: In this paper, the analysis of lake sediments retrieved from the deepest part of Lake Nam Co (Tibetan Plateau) was performed for geochemical and biological parameters, and the results showed that hydrological variations in terms of lake level change based on monsoonal strength can be linked to redox conditions at the lake bottom of Nam Co.
Journal ArticleDOI
Heavy metals in the surface sediments of lakes on the Tibetan Plateau, China
TL;DR: The results of geoaccumulation index (Igeo) and potential ecological risk factor (Eir) assessments showed that the sediments were moderately polluted by Cd and As, which posed much higher risks than the other metals.
Journal ArticleDOI
Reviews and syntheses: How do abiotic and biotic processes respond to climatic variations in the Nam Co catchment (Tibetan Plateau)?
Sten Anslan,Mina Azizi Rad,Mina Azizi Rad,Johannes Buckel,Paula Gabriela Echeverría Galindo,Jinlei Kai,Wengang Kang,Laura Keys,Philipp Maurischat,Felix Nieberding,Eike Reinosch,Handuo Tang,Tuong Vi Tran,Yuyang Wang,Antje Schwalb +14 more
TL;DR: In this paper, a review gives an interdisciplinary overview of past and modern environmental changes using Nam Co as a case study, and the authors outline perspectives to further understand the effects of global warming on geodiversity and biodiversity and their interplay at Nam Co.
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