Sediment and soil organic carbon loss during continuous extreme scouring events on the Loess Plateau

Zhang, Yi; Li, Peng; Liu, Xiaojun; Xiao, Lie; Chang, Enhao; Su, Yirong; Zhang, Jianwen; Zhan, Lihua

doi:10.1002/saj2.20169

Cited by 6 publications

(6 citation statements)

References 48 publications

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“…In this study, we investigated SOC mineralization in soils where farmland was fallowed for other land use. In the topsoil (0-20 cm) at the initial incubation stage (Figure 2), SOC mineralization in forestland, grassland, and shrubland increased initially, similar to that reported by Liu et al (2020), but decreased in farmland. During the early mineralization incubation stages, decomposing SOC is primarily derived from active C, consisting primarily of plant residues, a significant number of microorganisms, and rapidly decomposing microscopic animal fragments (Qi et al, 2022).…”

Section: Soc Mineralization Response To the Ggpsupporting

confidence: 83%

“…During the early mineralization incubation stages, decomposing SOC is primarily derived from active C, consisting primarily of plant residues, a significant number of microorganisms, and rapidly decomposing microscopic animal fragments (Qi et al, 2022). The rapid release of large amounts of nutrients promotes microbial activity, which in turn leads to a rapid increase in SOC mineralization (Li et al, 2020). Macroaggregate formation by glomalin-related root secretions likely increased after farmland was recolonized by vegetation, transforming into forestland, grassland, and shrubland (Xiao, Yang, et al, 2019), significantly reducing erosion and stripping fine soil particles rich in SOC (Zhang et al, 2020).…”

Section: Soc Mineralization Response To the Ggpmentioning

confidence: 99%

“…Farmlands are highly susceptible to erosion, which leads to the removal and transportation of fine particles rich in organic matter (Zhang et al, 2020). Tillage also leads to an extreme lack of exogenous C replenishment.…”

Section: Soc Mineralization Response To the Ggpmentioning

confidence: 99%

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Surface soil microbiome changes in Grain for Green Project accelerates organic carbon mineralization on the Loess Plateau in China

Zhang,

Liu,

et al. 2024

Earth Surf Processes Landf

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Increasing amounts of greenhouse gases, such as CO2, released into the atmosphere have a profound impact on global climate change. Understanding how soil organic carbon (SOC) mineralization changes as a result of land‐use change can shed light on the mechanisms by which SOC mineralization occurs, thus illuminating pathways to achieve global C neutrality targets. Accordingly, the Grain for Green Project (GGP) on the Loess Plateau was used as the starting point to observe how microorganisms affect SOC mineralization through field sampling and laboratory incubation experiments. We found a significant increase in SOC mineralization rates resulting from the GGP, though only at the soil surface (0.47–6.40 mg·kg−1 soil·day−1). We also found that soil microorganisms had a significant effect on different types of C sources, and Proteobacteria and Ascomycota/Mortierellomycota were the dominant bacterial and fungal groups at the GGP sites. The factors limiting SOC mineralization varied with farmland conversion to other land‐use types, and the direct and interactive contributions of these factors were quantified. The explanatory power examined in terms of land‐use ability to directly predict SOC mineralization rates was as follows: farmland (0.82), grassland (0.76), shrubland (0.41), and forestland (0.29). Along the increasing vegetative complexity gradient from farmland to forestland, the individual variable explanatory values decreased, while the relative importance of the interactive effects between variables increased. Our research demonstrates that the GGP increased soil biological activity and improved microbial community ability to metabolize C sources, thereby accelerating SOC mineralization. This will provide a scientific basis for decisions to enhance global semidrought recovery.

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Section: Soc Mineralization Response To the Ggpsupporting

confidence: 83%

Section: Soc Mineralization Response To the Ggpmentioning

confidence: 99%

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Surface soil microbiome changes in Grain for Green Project accelerates organic carbon mineralization on the Loess Plateau in China

Zhang,

Liu,

et al. 2024

Earth Surf Processes Landf

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“…For different time scales, the considered factors for SOC prediction are also different. On short rainfall time scales, soil erosion eliminates the physical protection of OCs and enriches the OCs protected by chemical combinations in sediments, thereby allowing them to be deposited at the deposition location; these are all decided by rain‐induced runoff hydraulic factors (Liu et al, 2022; Zhang et al, 2020). At long time scales, changes in soil texture and material composition caused by soil erosion should be considered in related SOC models (Percival et al, 2000; Torn et al, 1997).…”

Section: Soc Prediction Under Water Erosionmentioning

confidence: 99%

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Liu

2023

European J Soil Science

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Soil may be a carbon source or sink under the effect of sediment and soil organic carbon (SOC) erosion, transport and deposition. Partial SOC processes to determine whether soil subjected to water erosion is a carbon sink or source have not been clarified but are essential for increasing and predicting SOC storage. In this review, the associations between SOC mineralization, stability and stock at erosion sites, in transported sediments and at deposition sites are clarified. An overview is given for possible determination standards that define soil carbon sinks and sources. Methods for enhancing SOC sequestration and suggestions for improving SOC prediction are also presented. Particle transport is an important intermediate process that determines the material base for SOC stability and sequestration in each erosion and deposition element. When subject to water erosion, a high probability of SOC physical stabilization and a thick soil layer are essential for soil to function as a SOC sink. Sediment transport weakens SOC physical protection in eroded areas but can promote aggregation factors at deposition sites in some cases while increasing the depth of SOC in the soil. In this circumstance, a good soil environment for plant growth facilitates the occurrence of carbon sinks. A concept for critical erosion intensity is proposed to understand SOC sink determination; the concept is presented as the volume of soil erosion per square kilometre (m3 km−2) for which the maximum reduction in vegetation cover or plant biomass still permits plants to provide enough organic matter to compensate for erosion‐induced SOC loss. If erosion intensity is higher than critical erosion intensity at the erosion site, soil degradation is obvious, and soil is presented as an OC source, and vice versa. Finally, the SOC burial method for increasing the soil carbon storage amounts in regions with thick soil layers is presented to explore the SOC sequestration potential in deep soil. The factors considered for SOC prediction should vary with research scale. We hope our review will have direct implications for the modelling of SOC dynamics under water erosion on both slopes and at large scales. Highlights Changes in soil texture and soil thickness greatly affect the amount of SOC storage at erosion and deposition sites. Selective transport of soil materials or chemical elements promotes soil aggregation. Possible standards that define soil carbon sinks and sources and suggestions for improving SOC prediction are presented. SOC burial may be a good method for increasing C storage amounts in regions with thick layers of fine soil.

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“…A new framework for exploring SOC content based on soil textures in different coastal wetlands has gradually been proposed, revealing that soil texture is a key factor influencing SOC [69,70]. The SOC content is generally considered to be proportional to clay and powder but inversely proportional to the sand content [71,72]. The organic carbon content of soil of different textures varies [73].…”

Section: Cw-soc Content Of Different Soil Texturesmentioning

confidence: 99%

Estimation of Soil Organic Carbon Content in Coastal Wetlands with Measured VIS-NIR Spectroscopy Using Optimized Support Vector Machines and Random Forests

et al. 2022

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Coastal wetland soil organic carbon (CW-SOC) is crucial for both “blue carbon” and carbon sequestration. It is of great significance to understand the content of soil organic carbon (SOC) in soil resource management. A total of 133 soil samples were evaluated using an indoor spectral curve and were categorized into silty soil and sandy soil. The prediction model of CW-SOC was established using optimized support vector machine regression (OSVR) and optimized random forest regression (ORFR). The Leave-One-Out Cross-Validation (LOO-CV) method was used to verify the model, and the performance of the two prediction models, as well as the models’ stability and uncertainty, was examined. The results show that (1) The SOC content of different coastal wetlands is significantly different, and the SOC content of silty soils is about 1.8 times that of sandy soils. Moreover, the characteristic wavelengths associated with SOC in silty soils are mainly concentrated in the spectral range of 500–1000 nm and 1900–2400 nm, while the spectral range of sandy soils is concentrated in the spectral range of 600–1400 nm and 1700–2400 nm. (2) The organic carbon prediction model of silty soil based on the OSVR method under the first-order differential of reflectance (R′) is the best, with the Adjusted-R2 value as high as 0.78, the RPD value is much greater than 2.0 and 5.07, and the RMSE value as low as 0.07. (3) The performance of the OSVR model is about 15~30% higher than that of the support vector machine regression (SVR) model, and the performance of the ORFR model is about 3~5% higher than that of the random forest regression (RFR) model. OSVR and ORFR are better methods of accurately predicting the CW-SOC content and provide data support for the carbon cycle, soil conservation, plant growth, and environmental protection of coastal wetlands.

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Sediment and soil organic carbon loss during continuous extreme scouring events on the Loess Plateau

Cited by 6 publications

References 48 publications

Surface soil microbiome changes in Grain for Green Project accelerates organic carbon mineralization on the Loess Plateau in China

Surface soil microbiome changes in Grain for Green Project accelerates organic carbon mineralization on the Loess Plateau in China

Is soil an organic carbon sink or source upon erosion, transport and deposition?

Estimation of Soil Organic Carbon Content in Coastal Wetlands with Measured VIS-NIR Spectroscopy Using Optimized Support Vector Machines and Random Forests

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