Priming, stabilization and temperature sensitivity of native SOC is controlled by microbial responses and physicochemical properties of biochar

Chen, Guanhong; Fang, Yunying; Zwieten, Lukas Van; Xuan, Yingxue; Tavakkoli, Ehsan; Wang, Xiaojie; Zhang, Renduo

doi:10.1016/j.soilbio.2021.108139

Cited by 61 publications

(16 citation statements)

References 70 publications

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“…97 Resistant C tends to be more vulnerable to the positive priming effects than the labile C pool in soil under a relatively low N supply. 103 Consequently, recalcitrant SOC and even biochar itself are decomposed, 79,105 presenting real positive priming effects. 98 Therefore, the accelerated C cycle is primed by exogenous OC and controlled by C/N, 97,106 evidenced by the fact that the effects are not necessarily linearly proportional to the amount of labile OC input.…”

Section: Effect Of Biochar On C Cycling In Soilmentioning

confidence: 99%

“…When fresh labile OC from biochar (particularly with C/N matching with microbial demands) is applied to soil, “r-strategist” microorganisms are preferentially promoted to decompose labile OC to obtain nutrients and energy, causing apparent positive priming effects, , that is, “stoichiometric decomposition”. , When labile OC (or available N) is exhausted or complex molecules of OC are input, “K-strategist” microorganisms tend to be promoted to obtain available N, that is, “microbial N mining” . Resistant C tends to be more vulnerable to the positive priming effects than the labile C pool in soil under a relatively low N supply . Consequently, recalcitrant SOC and even biochar itself are decomposed, , presenting real positive priming effects .…”

Section: Effect Of Biochar On C Cycling In Soilmentioning

confidence: 99%

“…Considering the critical role of N in the priming effects in soil, two competing hypotheses“stoichiometric decomposition” and “microbial N mining”are proposed to explain the priming effects . When fresh labile OC from biochar (particularly with C/N matching with microbial demands) is applied to soil, “r-strategist” microorganisms are preferentially promoted to decompose labile OC to obtain nutrients and energy, causing apparent positive priming effects, , that is, “stoichiometric decomposition”. , When labile OC (or available N) is exhausted or complex molecules of OC are input, “K-strategist” microorganisms tend to be promoted to obtain available N, that is, “microbial N mining” . Resistant C tends to be more vulnerable to the positive priming effects than the labile C pool in soil under a relatively low N supply .…”

Section: Effect Of Biochar On C Cycling In Soilmentioning

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: Effect Of Biochar On C Cycling In Soilmentioning

confidence: 99%

Section: Effect Of Biochar On C Cycling In Soilmentioning

confidence: 99%

Section: Effect Of Biochar On C Cycling In Soilmentioning

confidence: 99%

See 1 more Smart Citation

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

Luo

Wang

et al. 2023

Environ. Sci. Technol.

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“…Recently, Xiang et al and Zhang et al [10,26] reviewed the negative challenges of biochar on crop production, soil properties and biota, and associated environmental risk. The detrimental aspects are as follows: (1) release of toxic compounds and heavy metals in biochar [27], (2) reduction in the bioavailability of soil-applied agrochemicals owing to sorption behavior [28], (3) N immobilization due to a high C/N ratio, thereby limiting plant N uptake [29], (4) increase in native soil organic C priming [30], (5) shifts in native soil biota [31]. Moreover, the time impact of soil-biochar interactions on N 2 O and NO emissions, crop performance, and soil properties cannot be ignored [32,33].…”

Section: Introductionmentioning

confidence: 99%

Biochar Mitigated Yield-Scaled N2O and NO Emissions and Ensured Vegetable Quality and Soil Fertility: A 3-Year Greenhouse Field Observation

Zhang

et al. 2022

Agronomy

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Biochar amendments have been widely used in agricultural soil for lowering N2O and NO emissions while improving soil fertility and crop performance. However, a thorough understanding of the longevity of the favorable effects would be a prerequisite for large-scale biochar application in agriculture. We conducted a three-year greenhouse vegetable trial in Southeast China to systematically investigate the impacts of biochar mixed with nitrogen (N) on soil N2O and NO emissions, vegetable performance, and soil fertility at an interannual scale. The field experiment was established in November 2016 with biochar (0, 20 and 40 t ha−1; C0, C1, and C2, respectively), applied once without/with 240 kg N ha−1 urea (N0 or N1, respectively). Soil N2O and NO emissions were monitored during the spring vegetable cultivation period, and vegetable yield, quality, and soil properties were measured after harvests in 2018, 2019, and 2020. Results indicated that N application significantly increased N2O and NO emissions and vegetable yield throughout the trial period. Biochar combined with N generally reduced N2O and NO emissions and emission factors while increasing the vegetable yield, leading to lower yield-scaled N2O and NO emissions in 2018 and 2019. Biochar markedly enhanced soil pH and organic carbon and persisted, but generally had no significant effect on N use efficiency (NUE), vegetable quality, and soil fertility index (SFI) among treatments in over-fertilized vegetable fields. Based on our results, biochar application at 20 t ha−1 combined with N seemed to achieve the highest agronomic and environmental benefits for intensive vegetable production in Southeast China.

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“…It is of note that at the initial stage of biochar application positive priming may be the dominant process because of the microbial utilization of labile carbon fractions from biochar, followed by decreased or even reversed priming intensity following several months of biochar application (Rasul et al 2022). The initial stimulated positive priming upon biochar application is attributed to the activities of r-strategist microorganisms that respond rapidly to the fresh carbon sources amended to soil (Chen et al 2021a). The long-term aging of biochar at field benefits negative priming via different mechanisms.…”

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confidence: 99%

Role of biochar toward carbon neutrality

et al. 2023

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Carbon neutrality by the mid-twenty-first century is a grand challenge requiring technological innovations. Biochar, a traditional soil amendment which has been used for fertility improvement and contaminant remediation, has revealed new vitality in this context. In this review we highlight the huge potential of biochar application in different fields to mitigate as high as 2.56 × 109 t CO2e total greenhouse gas (GHG) emissions per year, accounting for 5.0% of the global GHG emissions. Soil applications of biochar as either a controlled-release fertilizer or an immobilization agent offer improved soil health while simultaneously suppressing the emissions of CH4 and N2O. Non-soil applications of biochar also contribute to carbon neutrality in unique ways. Firstly, biochar application as a ruminant feed decreases CH4 emissions via physical sorption and enhanced activities of methanotrophs. Secondly, biochar can be used as a green catalyst for biorefinery. Besides, biochar as an additive to Portland cement and low impact development (LID) infrastructure lowers the carbon footprint and builds resilience to climate change. Furthermore, biochar can be used as novel batteries and supercapacitors for energy storage purposes. Finally, the high CO2 adsorption capacity makes it possible for biochar being used as a sorbent for carbon capture, utilization, and storage (CCUS). We advocate that future research should further explore the effectiveness of biochar systems for climate change mitigation in large scale applications, and assess the economic and social viability of local biochar systems to combat climate change. Graphical Abstract

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Priming, stabilization and temperature sensitivity of native SOC is controlled by microbial responses and physicochemical properties of biochar

Cited by 61 publications

References 70 publications

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

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

Biochar Mitigated Yield-Scaled N2O and NO Emissions and Ensured Vegetable Quality and Soil Fertility: A 3-Year Greenhouse Field Observation

Role of biochar toward carbon neutrality

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