Evaluation of long-term carbon sequestration of biochar in soil with biogeochemical field model

Yin, Jianxiang; Zhao, Ling; Xu, Xiaoyun; Li, Deping; Qiu, Hao; Cao, Xinde

doi:10.1016/j.scitotenv.2022.153576

Cited by 30 publications

(17 citation statements)

References 63 publications

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“…19,101,156,157 For instance, the high labile OC input from biochar application would stimulate microorganisms to produce more N-acquiring enzymes to meet their N demand and maintain the microbial stoichiometry homeostasis, 158 resulting in nutrient competition between crops and microorganisms. 100 In addition, biochar is highly dependent on application rates in its functions in improving and remediating soils 89,159 and may have effects opposite to those anticipated with its increasing or continuous application. 47,160 How much biochar soil can receive without affecting its normal fundamental function remains unclear to date.…”

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

“…162 By contrast, applying pyrochar into subsoils seems to be a more attractive strategy for long-term C sequestration according to a biogeochemical field model. 159 Apart from the possible negative impacts of biochar on soil health, the lack of economic driving forces 11,163 is another important resistance to the application of biochar in soil. In other words, the application of biochar to sequester C remains an expensive undertaking.…”

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

“…Excessive application of pyrochar to soil may decrease the (bio)availability and use efficiency of nutrients (such as N and P) instead, due to its strong immobilization and sorption capacities for elements including nutrients. , Biochar can also lead to C/N stoichiometric disbalance and deteriorate soil structure and microbial community if overapplied, seriously affecting the ecosystem services of soil. ,,, For instance, the high labile OC input from biochar application would stimulate microorganisms to produce more N-acquiring enzymes to meet their N demand and maintain the microbial stoichiometry homeostasis, resulting in nutrient competition between crops and microorganisms . In addition, biochar is highly dependent on application rates in its functions in improving and remediating soils , and may have effects opposite to those anticipated with its increasing or continuous application. , How much biochar soil can receive without affecting its normal fundamental function remains unclear to date. It is urgent to explore the threshold value and sustainability of biochar application in soil and its relationship with biochar properties and soil types. ,, It is more viable to promote biochar application practices with the aim of improving soil quality and functioning before a safe application threshold is developed.…”

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

“…From this perspective, hydrochar is a better soil amendment/conditioner than pyrochar because of its higher activities in the cycling of C and slow-release (not highly immobilized) nutrients in soil . By contrast, applying pyrochar into subsoils seems to be a more attractive strategy for long-term C sequestration according to a biogeochemical field model …”

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

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Carbon Sequestration Strategies in Soil Using Biochar: Advances, Challenges, and Opportunities

Luo

Wang

et al. 2023

Environ. Sci. Technol.

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Biochar, a carbon (C)-rich material obtained from the thermochemical conversion of biomass under oxygen-limited environments, has been proposed as one of the most promising materials for C sequestration and climate mitigation in soil. The C sequestration contribution of biochar hinges not only on its fused aromatic structure but also on its abiotic and biotic reactions with soil components across its entire life cycle in the environment. For instance, minerals and microorganisms can deeply participate in the mineralization or complexation of the labile (soluble and easily decomposable) and even recalcitrant fractions of biochar, thereby profoundly affecting C cycling and sequestration in soil. Here we identify five key issues closely related to the application of biochar for C sequestration in soil and review its outstanding advances. Specifically, the terms use of biochar, pyrochar, and hydrochar, the stability of biochar in soil, the effect of biochar on the flux and speciation changes of C in soil, the emission of nitrogen-containing greenhouse gases induced by biochar production and soil application, and the application barriers of biochar in soil are expounded. By elaborating on these critical issues, we discuss the challenges and knowledge gaps that hinder our understanding and application of biochar for C sequestration in soil and provide outlooks for future research directions. We suggest that combining the mechanistic understanding of biochar-to-soil interactions and long-term field studies, while considering the influence of multiple factors and processes, is essential to bridge these knowledge gaps. Further, the standards for biochar production and soil application should be widely implemented, and the threshold values of biochar application in soil should be urgently developed. Also needed are comprehensive and prospective life cycle assessments that are not restricted to soil C sequestration and account for the contributions of contamination remediation, soil quality improvement, and vegetation C sequestration to accurately reflect the total benefits of biochar on C sequestration in soil.

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Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

Section: Application Barriers Of Biochar In Soil From the Perspective...mentioning

confidence: 99%

See 2 more Smart Citations

Carbon Sequestration Strategies in Soil Using Biochar: Advances, Challenges, and Opportunities

Luo

Wang

et al. 2023

Environ. Sci. Technol.

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“…Carbon sequestration [ 1 , 2 ], farmland fertility enhancement [ 3 ], and soil remediation have all received a lot of attention from the environmental and agricultural industries. Biochar is a black carbon-rich solid generated by the thermal decomposition of biomass under oxygen-limited circumstances at temperatures ranging from 300 to 700 °C [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating Biochar-Derived Dissolved Organic Carbon (DOC) Components Extracted Using a Sequential Extraction Protocol

et al. 2022

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Biochar-derived dissolved organic carbon (DOC), as the most important component of biochar, can be released on farmland, improving fertility and playing a role in soil amendment and remediation. The complexity of molecular structures and diversity of DOC compounds have influenced these functions to some extent. A sequential extract protocol consisting of water (25 °C), hot water (80 °C), and NaOH solution (0.05 M) was used to fully extract DOC compounds and gain a thorough understanding of the possible DOC components released from biochar. Rape straw (RS), apple tree branches (ATB), and pine sawdust (PS) were pyrolyzed at 300, 500, and 700 °C, respectively, to make nine distinct biochars. A TOC analyser, ultraviolet-visible spectroscopy (UV–vis), and excitation–emission fluorescence (EEM) spectrophotometer were used in conjunction with parallel factor analysis (PARAFAC) to determine the distribution of DOC content, the diversity of aromaticity, molecular weight characteristics and components of biochar-derived DOC. The results show that the relative distribution of water-extractable fractions ranged from 3.21 to 35.57%, with a low-aromaticity and extremely hydrophilic fulvic-acid-like compounds being found in the highest amounts (C2 and C3). The smallest amount of hot water-extractable components was produced from the release of small-molecule aliphatic compounds adsorbed on biochar and susceptible to migration loss once in a soil solution. More than half of the biochar-derived DOC was released in a NaOH solution, which primarily consisted of humic-acid-like compounds (C1), with higher molecular weights, more aromaticity, and lower bioavailability, according to the distribution of DOC in various extractants. In addition, the pyrolysis temperature and biomass type had a significant impact on the DOC properties released by biochar. As a result, the findings of this study showed that using a sequential extract protocol of water, hot water, and NaOH solution in combination with spectroscopic methods could successfully reveal the diversity of biochar-derived components, which could lead to new insights for the accurate assessment of potential environmental impacts and new directions for biochar applications.

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Soil Management for Carbon Sequestration

Rasafi

Moukhtari

Haouas

et al. 2023

Agroecological Approaches for Sustainable Soil Management

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Evaluation of long-term carbon sequestration of biochar in soil with biogeochemical field model

Cited by 30 publications

References 63 publications

Carbon Sequestration Strategies in Soil Using Biochar: Advances, Challenges, and Opportunities

Carbon Sequestration Strategies in Soil Using Biochar: Advances, Challenges, and Opportunities

Investigating Biochar-Derived Dissolved Organic Carbon (DOC) Components Extracted Using a Sequential Extraction Protocol

Soil Management for Carbon Sequestration

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