Optimizing biochar application to improve soil physical and hydraulic properties in saline-alkali soils

Liang, Jiaping; Li, Yang; Si, Bingcheng; Wang, Yanzi; Chen, Xinguo; Wang, Xiaofang; Chen, Haoran; Wang, Haoran; Zhang, Fucang; Bai, Yanchao; Biswas, Asim

doi:10.1016/j.scitotenv.2020.144802

Cited by 122 publications

(53 citation statements)

References 59 publications

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“…Salt-affected soils are generally low in N, P, and K due to a low input of organic matter from plant biomass and high losses of organic matter. The application of biochar in improving salt-affected soil received more attention recently [173]. It is common knowledge that salt-affected soil often shows poor physical and hydraulic properties, thereby leading to poor soil.…”

Section: Nitrification Transforms Nhmentioning

confidence: 99%

The Role of Biochar in Regulating the Carbon, Phosphorus, and Nitrogen Cycles Exemplified by Soil Systems

Pan

Dong

et al. 2021

Sustainability

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Biochar is a carbon-rich material prepared from the pyrolysis of biomass under various conditions. Recently, biochar drew great attention due to its promising potential in climate change mitigation, soil amendment, and environmental control. Obviously, biochar can be a beneficial soil amendment in several ways including preventing nutrients loss due to leaching, increasing N and P mineralization, and enabling the microbial mediation of N2O and CO2 emissions. However, there are also conflicting reports on biochar effects, such as water logging and weathering induced change of surface properties that ultimately affects microbial growth and soil fertility. Despite the voluminous reports on soil and biochar properties, few studies have systematically addressed the effects of biochar on the sequestration of carbon, nitrogen, and phosphorus in soils. Information on microbially-mediated transformation of carbon (C), nitrogen (N), and phosphorus (P) species in the soil environment remains relatively uncertain. A systematic documentation of how biochar influences the fate and transport of carbon, phosphorus, and nitrogen in soil is crucial to promoting biochar applications toward environmental sustainability. This report first provides an overview on the adsorption of carbon, phosphorus, and nitrogen species on biochar, particularly in soil systems. Then, the biochar-mediated transformation of organic species, and the transport of carbon, nitrogen, and phosphorus in soil systems are discussed. This review also reports on the weathering process of biochar and implications in the soil environment. Lastly, the current knowledge gaps and priority research directions for the biochar-amended systems in the future are assessed. This review focuses on literatures published in the past decade (2009–2021) on the adsorption, degradation, transport, weathering, and transformation of C, N, and P species in soil systems with respect to biochar applications.

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Section: Nitrification Transforms Nhmentioning

confidence: 99%

The Role of Biochar in Regulating the Carbon, Phosphorus, and Nitrogen Cycles Exemplified by Soil Systems

Pan

Dong

et al. 2021

Sustainability

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“…The pH curve of acidic soil without CAS reached the lowest point at 30 min and a pH of 3.21. Previous reports have shown (Feizbakhshan et al, 2021;Liang et al, 2021) that activated carbon and biochar have abundant oxygen-containing active groups, high aromaticity, rich pore structure, and large specific surface area. They were used to improve the stability of the soil structure, promote the formation of aggregates, and provide oxygen-containing active groups for the oxidation of ASS.…”

Section: Oxidation Optimization Capabilitymentioning

confidence: 98%

Ca-Al-Containing Slag As an Advanced Fenton System for the Remediation of Acid Sulfate Soil

Zeng¹,

Feng²,

Wei³

et al. 2021

Environmental Engineering Science

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For the first time, an industrial solid waste (CAS) was used for the rapid oxidation and neutralization of acidic sulfate soil. The waste mainly contained Fe-doped CaCO 3 and CaAl-layered double hydroxide (LDH). After treatment, CAS neutralized the acidic soil with the aid of hydrogen peroxide. Compared with other oxidationaccelerating materials, including activated carbon, biochar, and Fe-doped biochar, CAS showed the best oxidation rate acceleration. When the ratio of CAS and sulfur in acidic soil was 1.5:1, the pH of the soil changed to 6.32 and the oxidation rate increased by 50%. The characterization results showed that the main products of CAS were CaMg oxides and Ca-Al LDH. The oxidation product (SO 4 2-) was intercalated into the LDH interlayers. The accelerated oxidation mechanism of CAS was divided into the following stages: accelerated Fenton oxidation; LDH adsorption of oxidized SO 4 2-; and neutralization of sulfuric acid by calcium carbonate. The main results of this work provide a high-value-added utilization method of solid waste for acidic soil remediation.

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“…Although many studies have investigated biochar effects on soil hydraulic properties (Abdo, 2020; Liang et al, 2021), there have been varying result, ranging from a decrease to no significant effects (Atkinson, 2018; Jeffery et al, 2015; Wang et al, 2021). It has also been widely shown that soil hydraulic characteristics are greatly affected by soil structure and colloidal properties.…”

Section: Introductionmentioning

confidence: 99%

Effects of biochar nanoparticles as a soil amendment on the structure and hydraulic characteristics of a sandy loam soil

Chen

Duan

Zhou

et al. 2021

Soil Use and Management

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Biochar as a soil amendment can influence the physical and solute transport properties of soils and, thus, provide a means to improve soil fertility. However, the use of different sized biochar particles down to the nano‐scale has revealed inconsistent results, with the mechanisms poorly understood owing to a lack of experimental data. This study investigated the effects and mechanisms of nano‐sized biochar particles (NBC) applied to a sandy loam soil with regard to impacts on the hydraulic characteristics and soil structure. Column experiments were carried out with NBC application rates of 0.0%, 0.3%, 0.5%, 0.7% and 1.0% (by weight). It was found that the NBC changed the distribution of the soil pore structure and affected the degrees of anisotropy, fractal dimension, soil porosity and stability of soil aggregates. NBC applications also increased the water repellency of the soil and reduced the surface energy of soil particles. Regarding soil hydraulic properties, NBC applications increased the saturated hydraulic conductivity of the soil and decreased soil water retention. Increasing the amount of NBC applied to the mixing‐layer decreased cumulative infiltration values (reduced by 3.75%–13.75%). The above results reveal how NBC affects the soil pore structure and soil hydraulic characteristics, which provides a theoretical basis for the systematic evaluation of soil improvement and environmental effects of nano‐sized biochar.

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Optimizing biochar application to improve soil physical and hydraulic properties in saline-alkali soils

Cited by 122 publications

References 59 publications

The Role of Biochar in Regulating the Carbon, Phosphorus, and Nitrogen Cycles Exemplified by Soil Systems

The Role of Biochar in Regulating the Carbon, Phosphorus, and Nitrogen Cycles Exemplified by Soil Systems

Ca-Al-Containing Slag As an Advanced Fenton System for the Remediation of Acid Sulfate Soil

Effects of biochar nanoparticles as a soil amendment on the structure and hydraulic characteristics of a sandy loam soil

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