Distribution characteristics and influencing factors of soil organic carbon in alpine ecosystems on the Tibetan Plateau transect, China

2008 ◽  
Vol 2 (4) ◽  
pp. 404-409 ◽  
Author(s):  
Yuqiang Tian ◽  
Hua Ouyang ◽  
Minghua Song ◽  
Haishan Niu ◽  
Qiwu Hu
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Influencing Factors ◽  
The Tibetan Plateau ◽  
Distribution Characteristics ◽  
Alpine Ecosystems

The storage and influencing factors of mercury in the permafrost of the Tibetan Plateau

2020 ◽  
Author(s):  
Jing Gu ◽  
Qiaotong Pang ◽  
Jinzhi Ding ◽  
Runsheng Yin ◽  
Yuanhe Yang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Atmospheric Deposition ◽  
Influencing Factors ◽  
Dry Deposition ◽  
Spatial Scales ◽  
The Arctic ◽  
Deposition Flux ◽  
The Tibetan Plateau

<p>Soil is one of the largest reservoir of mercury in the environment. Globally, most of the mercury in the soil is stored in permafrost, such as the Arctic and the Tibetan Plateau. Mercury in the soil is mainly derived from atmospheric deposition and tightly bound to the organic carbon. The mercury level in the permafrost over the Tibetan Plateau and its influencing factors have been less studied. This study analyzes soil total mercury (STHg) concentrations and its vertical distribution in meadow soil samples collected from the Tibetan Plateau. We adopt a nested-grid high-resolution GEOS-Chem model to simulate atmospheric mercury deposition. The relationship between STHg and soil organic carbon(OCD) as well as atmospheric deposition are explored. We also extend our analysis to data in the Tibetan Plateau and other regions of China in the literature. Our results show that the STHg concentrations in the Tibetan Plateau are 19.9±12.4 ng/g. The concentrations are higher in the south/east and lower in the north/west in the Tibetan Plateau, consistent with the previous results. Our model shows that the average deposition flux of Hg is 3.3 ug m<sup>-2</sup> yr<sup>-1</sup> with 57% contributed by dry deposition of Hg<sup>0</sup>, followed by dry deposition of Hg<sup>II</sup> and Hg<sup>P </sup>(19%) and wet deposition (24%). We calculate the Hg to carbon ratio (R<sub>HgC</sub>) of 5.52 ± 5.11 μg Hg/g C and the estimated STHg is 67.45 Gg in alpine grasslands in the Tibetan Plateau, contributing about 2.7% globally. We find a positive correlation between OCD and STHg in the Tibetan Plateau(Log(STHg) = 0.35log(OCD) + 0.99, R<sup>2</sup> = 0.24) and a weak relationship between model residual (defined as the difference between model fitting values and observations) and atmospheric total Hg deposition. We conclude that soil organic carbon(SOC) and atmospheric deposition work simultaneously for STHg. Atmospheric deposition determines the potential levels of STHg in large spatial scales, while SOC and its characteristics modulate STHg locally by influencing the fate and transport of Hg.</p>

scholarly journals Soil Organic Carbon Pools and Stocks in Permafrost-Affected Soils on the Tibetan Plateau

PLoS ONE ◽  
2013 ◽  
Vol 8 (2) ◽  
pp. e57024 ◽  
Author(s):  
Corina Dörfer ◽  
Peter Kühn ◽  
Frank Baumann ◽  
Jin-Sheng He ◽  
Thomas Scholten
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Pools ◽  
The Tibetan Plateau ◽  
Soil Organic Carbon Pools

scholarly journals Impacts of management practices on soil organic carbon in degraded alpine meadows on the Tibetan Plateau

2014 ◽  
Vol 11 (13) ◽  
pp. 3495-3503 ◽  
Author(s):  
X. F. Chang ◽  
X. X. Zhu ◽  
S. P. Wang ◽  
S. J. Cui ◽  
C. Y. Luo ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Management Practices ◽  
Carbon Sink ◽  
Research Station ◽  
The Tibetan Plateau ◽  
Century Model ◽  
Alpine Meadows

Abstract. Grassland soil organic carbon (SOC) is sensitive to anthropogenic activities. Increased anthropogenic disturbance related to overgrazing has led to widespread alpine grassland degradation on the Tibetan Plateau. The degraded grasslands are considered to have great potential for carbon sequestration after adoption of improved management practices. Here, we calibrated and employed the Century model to investigate the effects of overgrazing and improved managements on the SOC dynamics in alpine meadows. We calibrated the Century model against plant productivity at the Haibei Research Station. SOC stocks for validation were obtained in 2009–2010 from degraded alpine meadows in two communes. We found that Century model can successfully capture grassland SOC changes. Overall, our simulation suggests that degraded alpine meadow SOC significantly increased with the advent of restoration management from 2011 to 2030. Carbon sequestration rates ranged between 0.04 Mg C ha−1 yr−1 in lightly degraded winter grazing grasslands and 2.0 Mg C ha−1 yr−1 in moderately degraded summer grazing grasslands. Our modelling work also predicts that improve management in degraded Tibetan grasslands will contribute to an annual carbon sink of 0.022–0.059 Pg C yr−1. These results imply that restoration of degraded grasslands in the Tibetan Plateau has great potential for soil carbon sequestration to mitigate greenhouse gases.

scholarly journals A Comparison of Two Methods for Quantifying Soil Organic Carbon of Alpine Grasslands on the Tibetan Plateau

PLoS ONE ◽  
2015 ◽  
Vol 10 (5) ◽  
pp. e0126372 ◽  
Author(s):  
Litong Chen ◽  
Dan F. B. Flynn ◽  
Xin Jing ◽  
Peter Kühn ◽  
Thomas Scholten ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
The Tibetan Plateau ◽  
Alpine Grasslands

scholarly journals Impacts of management practices on soil organic carbon in degraded alpine meadows on the Tibetan Plateau

2014 ◽  
Vol 11 (1) ◽  
pp. 417-440
Author(s):  
X. F. Chang ◽  
S. P. Wang ◽  
X. X. Zhu ◽  
S. J. Cui ◽  
C. Y. Luo ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Tibetan Plateau ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Management Practices ◽  
Carbon Sink ◽  
Research Station ◽  
The Tibetan Plateau ◽  
Century Model ◽  
Alpine Meadows

Abstract. Grassland soil organic carbon (SOC) is sensitive to anthropogenic activities. Increased anthropogenic disturbance related to overgrazing has led to widespread alpine grassland degradation on the Tibetan Plateau. The degraded grasslands are considered to have great potential for carbon sequestration after adoption of improved management practices. Here, we calibrated and employed the Century model to investigate the effects of overgrazing and improved managements on the SOC dynamics in alpine meadows. We calibrated Century model against plant productivity at Haibei Research Station. SOC stocks for validation were obtained in 2009–2010 from degraded alpine meadows in two communes. We found that Century model can successfully capture grassland SOC changes. Overall, our simulation suggests that degraded alpine meadow SOC significantly increased with the advent of restoration managements from 2011 to 2030. Carbon sequestration rates ranged between 0.04 Mg C ha−1 yr−1 in lightly degraded winter grasslands and 2.0 Mg C ha−1 yr−1 in moderately degraded summer grasslands. Our modeling work also predicts that improve management in Tibetan degraded grasslands will contribute to an annual carbon sink of 0.022–0.059 Pg C yr−1. These results imply that restoration of degraded grasslands in Tibetan Plateau has great potential for soil carbon sequestration to mitigate greenhouse gases.

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