A comparison of different methods for determining the organic and inorganic carbon content of lake sediment from two lakes on the Tibetan Plateau

2012 ◽  
Vol 250 ◽  
pp. 49-54 ◽  
Author(s):  
Junbo Wang ◽  
Liping Zhu ◽  
Yong Wang ◽  
Shaopeng Gao ◽  
Gerhard Daut
Keyword(s):  
Tibetan Plateau ◽  
Carbon Content ◽  
Lake Sediment ◽  
Inorganic Carbon ◽  
The Tibetan Plateau ◽  
Organic And Inorganic Carbon

Land-use effects on organic and inorganic carbon patterns in the topsoil around Qinghai Lake basin, Qinghai-Tibetan Plateau

CATENA ◽  
2016 ◽  
Vol 147 ◽  
pp. 345-355 ◽  
Author(s):  
Chunli Li ◽  
Qi Li ◽  
Liang Zhao ◽  
Shidong Ge ◽  
Dongdong Chen ◽  
...  
Keyword(s):  
Land Use ◽  
Tibetan Plateau ◽  
Inorganic Carbon ◽  
Qinghai Lake ◽  
Lake Basin ◽  
Organic And Inorganic Carbon ◽  
Land Use Effects ◽  
Qinghai Lake Basin

Late Holocene Varve Chronology and High-Resolution Records of Precipitation in the Central Tibetan Plateau

2020 ◽  
Author(s):  
Kejia Ji ◽  
Erlei Zhu ◽  
Guoqiang Chu ◽  
Juzhi Hou
Keyword(s):  
Tibetan Plateau ◽  
Lake Sediment ◽  
Sediment Cores ◽  
Coarse Grained ◽  
The Tibetan Plateau ◽  
Past Climate ◽  
Environment Changes ◽  
The Past ◽  
Varve Chronology ◽  
Past 2000 Years

<p>Precise age controls are fundamental prerequisites for reconstructing past climate and environment changes. Lakes on the Tibetan Plateau are one of the important archives for studying past climate and environment changes. However, radiocarbon ages for lake sediment core are subject to old radiocarbon reservoir effects, which caused severe problems in constructing age controls for lake sediment cores, especially on the Tibetan Plateau (TP). Here we present a varve chronology over the past 2000 years at Jiang Co on the central TP. The clastic-biogenic varves comprise of a coarse-grained layer and a fine-grained layer observed by petrographic microscope and Electron Probe Micro Analyzer. Varve chronology is supported by measurements of <sup>210</sup>Pb and <sup>137</sup>Cs, which is further used to determine the radiocarbon reservoir ages in the past ~2000 years. The percentage of coarse-grain layer thickness within single varves was considered as proxy for precipitation as the coarse grains were mainly transported by runoff, which is highly correlated with local meteorological observation. During the past 2000 years, the precipitation records show centennial-scale fluctuations that are consistent with regional records. The varve chronology at Jiang Co provides a valuable opportunity to examine variation in reservoir ages on the TP and a robust chronology for reconstructing paleoclimate.</p>

Lateral and Vertical Variations of Soil Organic and Inorganic Carbon Content in Aridisols and Entisols of a Rangeland

2019 ◽  
Vol 52 (9) ◽  
pp. 1051-1062 ◽  
Author(s):  
A. Sharififar ◽  
F. Sarmadian ◽  
H. Alikhani ◽  
A. Keshavarzi ◽  
O. Asghari ◽  
...  
Keyword(s):  
Carbon Content ◽  
Inorganic Carbon ◽  
Organic And Inorganic Carbon ◽  
Vertical Variations

Dissolved inorganic carbon determines the abundance of microbial primary producers and primary production in Tibetan Plateau lakes

2020 ◽  
Author(s):  
Linyan Yue ◽  
Weidong Kong ◽  
Chunge Li ◽  
Guibing Zhu ◽  
Liping Zhu ◽  
...  
Keyword(s):  
Climate Change ◽  
Tibetan Plateau ◽  
Primary Production ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Future Climate Change ◽  
The Tibetan Plateau ◽  
Climate Change Scenarios ◽  
Primary Producers ◽  
Inland Lakes

Abstract Climate change globally accelerates the shrinkage of inland lakes, resulting in increases in both water salinity and dissolved inorganic carbon (DIC). The increases of salinity and DIC generate contrasting effects on microbial primary producers and primary production, however, their combined effects remain unclear in aquatic ecosystems. We hypothesized that increased DIC mitigates the constraints of enhanced salinity on microbial primary producers and primary production. To test this, we employed isotope labeling and molecular methods to explore primary production and four dominant types of microbial primary producers (form IA, IB, IC and ID) in lakes on the Tibetan Plateau. Results exhibited that DIC positively correlated with abundance of microbial primary producers and primary production (all P < 0.001) and offset salinity constraints. Structural equation models elucidated that DIC substantially enhanced primary production by stimulating the abundance of form ID microbial primary producers. The abundance of form ID primary producers explained more variations (14.6%) of primary production than form IAB (6%) and physicochemical factors (6.8%). Diatoms (form ID) played a determinant role in primary production in the lakes, by adapting to high DIC and high salinity. Our findings suggest that inland lakes may support higher primary productivity in future climate change scenarios.

Content and Distribution of Organic And Inorganic Carbon in the Urban Soils of Rostov Agglomeration

2020 ◽  
pp. 118-129
Author(s):  
Suleiman S. Tagiverdiev ◽  
Pavel N. Skripnikov ◽  
Olga S. Bezuglova ◽  
Sergey N. Gorbov ◽  
Denis A. Kozyrev
Keyword(s):  
Carbon Content ◽  
Inorganic Carbon ◽  
Middle Part ◽  
Organic Carbon Content ◽  
Organic And Inorganic Carbon ◽  
Natural Analogues ◽  
Comparison Pair ◽  
Diagnostic Horizons ◽  
High Degree ◽  
Native Soils

The content and distribution of organic and inorganic carbon along the profile in the soils of the Rostov agglomeration are considered. The results obtained on a TOC-L CPN Shimadzu carbon analyzer are evaluated using Student's t-test. The groups of some horizons of native soils AU rz, AU, BCA, C, as well as their buried analogues [AU], [BCA], [C] were compared. The analysis of the urbic horizons was carried out taking into account their particle size distribution, previously dividing into horizons clusters - heavy URh and light URl. In the [AU] horizon of soils buried under the anthropogenic stratum, a statistically significant decrease in the organic carbon content is observed, compared to the AU horizon of natural analogues. The middle part of the profile - the BCA and [BCA] horizons - is characterized by the greatest similarity in carbon content, both organic and inorganic, which suggests the lowest anthropogenic impact on these horizons. Significant differences in the inorganic carbon content in the comparison pair - horizons C and [C] are shown, and its content is higher in natural analogues (horizons C). The data analysis of the urbic diagnostic horizons did not reveal any significant regularities because of the high degree of variation of this indicator due to the genesis peculiarities of the anthropogenically transformed stratum.

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