Characteristics of soil C:N ratio and δ13C in wheat-maize cropping system of the North China Plain and influences of the Yellow River

Shi, Hangbo; Wang, Xiujun; Xu, Minggang; Zhang, Haibo; Luo, Yongming

doi:10.1038/s41598-017-17060-3

Cited by 26 publications

(9 citation statements)

References 41 publications

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“…Recent studies have revealed that in the YRD, SOC stock is generally lower in the higher salinity soils (3.05 kg C m −2 in the 0–60 cm) (Setia et al, 2013) than in the lower salinity soils (5.73 kg C m −2 in the 0–100 cm) (Guo et al, 2016). In addition, a recent study (Shi, Wang, Xu, Zhang, & Luo, 2017) has showed that SOC level is significantly lower in subsoil in the upper YRD than in the Hebei Plain with the same soil type and cropping system, and their analysis suggests that the lower levels of SOC in the YRD may be partly resulted from hydrological processes (e.g., salty water movements) that could lead to desorption of SOC and subsequently leaching/removal of DOC. In this study, we selected three sections in typical croplands (with various degrees of salinity) in the YRD, and evaluated the variability of SOC, SIC, and water‐extractable organic carbon (WEOC) together with other soil properties.…”

Section: Introductionmentioning

confidence: 99%

Impacts of salinity on the stability of soil organic carbon in the croplands of the Yellow River Delta

Zhang

Wang

et al. 2020

Land Degrad Dev

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This study aims to improve our understanding of the mechanisms regulating the stability of soil organic carbon (SOC) in saline–alkaline soils. We hypothesized that desorption of SOC is greater in higher salinity/higher pH soils, and the higher level of soil inorganic carbon (SIC) leads to enhanced SOC stability (or weaker SOC desorption) in saline–alkaline soils like those of the Yellow River Delta (YRD). We collected soils from 23 cropland sites (from 0–100 cm) along three lines (upper, middle, and lower lines, with different salinity) across the Yellow River, which have high pH (7.97–9.02). We analyzed SOC, SIC, and water‐extractable organic carbon (WEOC) and salts. Our data showed a large range in SOC (2.3–11.7 kg C m−2) and SIC stocks (13.3–24.7 kg C m−2) over 0–100 cm. The lowest SOC and SIC stocks were found in the lower YRD where soil pH was highest (8.6–9.0). WEOC:SOC ratio (an indicator for SOC desorption) was greater in soils with higher pH, lower SIC, and/or water‐extractable Ca2+ plus Mg2+, indicating that SOC stability is weak in high salinity/high pH soils, but high levels of SIC or Ca2+/Mg2+ can increase SOC stability. Our study suggests that amelioration practice may lead to an increase in both SOC and SIC stocks in saline–alkaline soils.

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Section: Introductionmentioning

confidence: 99%

Impacts of salinity on the stability of soil organic carbon in the croplands of the Yellow River Delta

Zhang

Wang

et al. 2020

Land Degrad Dev

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“…However, our approach could introduce bias or uncertainty due to the choice of end member value for soil C:N ratio. According to our recent study 31 , soil C:N ratio varied from 9.5 to 13.4 in the middle-lower parts of Yellow River Basin. If we chose 9.5 (or 13.4) as the soil C:N end member, the terrigenous contribution would be increased (or decreased) by 4–25%.…”

Section: Discussionmentioning

confidence: 91%

Organic and inorganic carbon and their stable isotopes in surface sediments of the Yellow River Estuary

Wang

Liu

et al. 2018

Sci Rep

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Studying the carbon dynamics of estuarine sediment is crucial to understanding of carbon cycle in the coastal ocean. This study is to evaluate the mechanisms regulating the dynamics of organic (TOC) and inorganic carbon (TIC) in surface sediment of the Yellow River Estuary (YRE). Based on data of 15 surface sediment cores, we found that TIC (6.3–20.1 g kg−1) was much higher than TOC (0.2–4.4 g kg−1). Both TOC and TIC were generally higher to the north than to the south, primarily due to the differences in kinetic energy level (i.e., higher to the south). Our analysis suggested that TOC was mainly from marine sources in the YER, except in the southern shallow bay where approximately 75% of TOC was terrigenous. The overall low levels of TOC were due to profound resuspension that could cause enhanced decomposition. On the other hand, high levels of TIC resulted partly from higher rates of biological production, and partly from decomposition of TOC associated with sediment resuspension. The isotopic signiture in TIC seems to imply that the latter is dominant in forming more TIC in the YRE, and there may be transfer of OC to IC in the water column.

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“…In addition, the C/N ratio was significantly positively correlated with SOC following vegetation restoration, including farmland. Deng et al [55] and Shi et al [25] also found that a low soil C/N ratio was associated with low SOC in the cropping system of the North China Plain. [56][57][58].…”

Section: Depthwise Distribution Of Soil Organic Carbonmentioning

confidence: 96%

Assessing Soil Organic Carbon in Soils to Enhance and Track Future Carbon Stocks

et al. 2020

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Soils represent the largest terrestrial sink of carbon (C) on Earth, yet the quantification of the amount of soil organic carbon (SOC) is challenging due to the spatial variability inherent in agricultural soils. Our objective was to use a grid sampling approach to assess the magnitude of SOC variability and determine the current SOC stocks in three typical agricultural fields in Maryland, United States. A selected area in each field (4000 m2) was divided into eight grids (20 m × 25 m) for soil sample collection at three fixed depth intervals (0–20 cm, 20–40 cm, and 40–60 cm). Soil pH in all fields was significantly (p < 0.05) greater in the surface soil layer (6.2–6.4) than lower soil layers (4.7–5.9). The mean SOC stocks in the surface layers (0–20 cm: 1.7–2.5 kg/m2) were 47% to 53% of the total SOC stocks at 0–60 cm depth, and were significantly greater than sub-surface layers (20–40 cm: 0.9–1.3 kg/m2; 40–60 cm: 0.8–0.9 kg/m2). Carbon to nitrogen (C/N) ratio and stable C isotopic composition (δ13C) were used to understand the characteristics of SOC in three fields. The C/N ratio was positively corelated (r > 0.96) with SOC stocks, which were lower in sub-surface than surface layers. Differences in C/N ratios and δ13C signatures were observed among the three fields. The calculated values of SOC stocks at 0–60 cm depth ranged from 37 to 47 Mg/ha and were not significantly different in three fields likely due to the similar parent material, soil types, climate, and a short history of changes in management practices. A small variability (~10% coefficient of variation) in SOC stocks across eight sampling grids in each field suggests that re-sampling these grids in the future can lead to accurately determining and tracking changes in SOC stocks.

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Characteristics of soil C:N ratio and δ13C in wheat-maize cropping system of the North China Plain and influences of the Yellow River

Cited by 26 publications

References 41 publications

Impacts of salinity on the stability of soil organic carbon in the croplands of the Yellow River Delta

Impacts of salinity on the stability of soil organic carbon in the croplands of the Yellow River Delta

Organic and inorganic carbon and their stable isotopes in surface sediments of the Yellow River Estuary

Assessing Soil Organic Carbon in Soils to Enhance and Track Future Carbon Stocks

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