The sources and seasonal fluxes of particulate organic carbon in the Yellow River

2020 ◽  
Vol 45 (9) ◽  
pp. 2004-2019 ◽  
Author(s):  
Yuanxin Qu ◽  
Zhangdong Jin ◽  
Jin Wang ◽  
Yunqiang Wang ◽  
Jun Xiao ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Yellow River ◽  
The Yellow River

Impacts of Natural and Human-Induced Hydrological Variability on Particulate Organic Carbon Dynamics in the Yellow River

2019 ◽  
Vol 53 (3) ◽  
pp. 1119-1129 ◽  
Author(s):  
Meng Yu ◽  
Timothy I. Eglinton ◽  
Negar Haghipour ◽  
Daniel B. Montluçon ◽  
Lukas Wacker ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Particulate Organic Carbon ◽  
Yellow River ◽  
Carbon Dynamics ◽  
The Yellow River ◽  
Hydrological Variability

scholarly journals Seasonal Variations in Dissolved Organic Carbon in the Source Region of the Yellow River on the Tibetan Plateau

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2901
Author(s):  
Xiaoni You ◽  
Xiangying Li
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Yellow River ◽  
Source Region ◽  
Precipitation Amount ◽  
Transport Processes ◽  
The Yellow River ◽  
Deposition Flux ◽  
The Tibetan Plateau ◽  
Permafrost Degradation

Rivers as the link between terrestrial ecosystems and oceans have been demonstrated to transport a large amount of dissolved organic carbon (DOC) to downstream ecosystems. In the source region of the Yellow River (SRYR), climate warming has resulted in the rapid retreat of glaciers and permafrost, which has raised discussion on whether DOC production will increase significantly. Here, we present three-year data of DOC concentrations in river water and precipitation, explore the deposition and transport processes of DOC from SRYR. Results show that annual mean concentrations of riverine DOC ranged from 2.03 to 2.34 mg/L, with an average of 2.21 mg/L. Its seasonal variation is characterized by the highest concentration in spring and summer (2.65 mg/L and 2.62 mg/L, respectively), followed by autumn (1.95 mg/L), and the lowest in winter (1.44 mg/L), which is closely related to changes in river runoff under the influence of precipitation and temperature. The average concentration of DOC in precipitation (2.18 mg/L) is comparable with riverine DOC, while the value is inversely related to precipitation amount and is considered to be the result of precipitation dilution. DOC deposition flux in precipitation that is affected by both precipitation amount and DOC concentration roughly was 86,080, 105,804, and 73,072 tons/yr from 2013 to 2015, respectively. DOC flux delivered by the river ranged from 24,629 to 37,539 tons/yr and was dominated by river discharge. Although permafrost degradation in SRYR is increasing, DOC yield is not as significant as previously assumed and is much less than other large rivers in the world.

scholarly journals Total and dissolved soil organic and inorganic carbon and their relationships in typical loess cropland of Fenggu Basin

2020 ◽  
Author(s):  
Tongping Lu ◽  
Xiujun Wang ◽  
Wenxi Zhang
Keyword(s):  
Organic Carbon ◽  
Soil Carbon ◽  
Loess Plateau ◽  
Soil Ph ◽  
Negative Correlation ◽  
Inorganic Carbon ◽  
Yellow River ◽  
The Yellow River ◽  
Hydrological Process ◽  
Complex Relationships

Abstract There is evidence of connections between soil organic carbon (SOC) and inorganic carbon (SIC) in dryland of north China. However, fractions of SOC and SIC and the relationship are not well understood in the Loess Plateau that undergoes profound erosion and redeposition. A study was conducted in low-elevation cropland of Loess Plateau across two distinctive basins: Linfen basin (LFB) with lower soil pH (<8.4) and subject to erosion-redeposition, and Yuncheng basin (YCB) with higher soil pH (>8.6) and under the influence of the Yellow River. Soil samples were collected from 30 sites over 100 cm. We determined SOC, SIC, dissolved organic carbon (DOC) and other properties. Above 100 cm, SOC stock is significantly higher in LFB (10.0±2.6 kg C m-2) than in YCB (6.9±1.5 kg C m-2), but SIC lower in LFB (14.0±2.5 kg C m-2) than in YCB (17.0±5.7 kg C m-2). We find a significantly negative correlation between SOC and SIC stocks in LFB, but no clear relationship in YCB. DOC:SOC ratio (an indicator for DOC desorption or SOC stability) is significantly higher below 40 cm in YCB (1.9%) than LFB (1.2%), indicating stronger DOC desorption in YCB that has stronger hydrological process due to the influence of the Yellow River. Overall, SOC has a negative correlation with SIC and soil pH, and DOC:SOC ratio has a significantly positive correlation with soil pH. Our analyses suggest that erosion/re-deposition of topsoil is partly responsible for the negative SIC-SOC relationship in LFB, and high soil pH and stronger hydrological processes are attributable to relatively lower levels of SOC in YCB. This study highlights that soil carbon fractions in the lowland of Loess Plateau are influenced by many drivers, which leads to complex relationships between major soil carbon pools.

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