Antagonistic interaction between biochar and nitrogen addition on soil greenhouse gas fluxes: A global synthesis

He, Yanghui; Yao, Yixian; Jia, Zhongjun; Chen, Xinyue; Zhou, Lingyan; Shao, Junjiong; Liu, Ruiqiang; Zhou, Guiyao; Fu, Yuzhen; Sun, Xiaoying; Zhou, Xuhui; Bai, Shahla Hosseini

doi:10.1111/gcbb.12878

Cited by 18 publications

(18 citation statements)

References 95 publications

(115 reference statements)

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“…Many reports indicate stimulation of N 2 O emission (T. He et al., 2018; Ji et al., 2020; L. Wang et al., 2020; Wu et al., 2021), while others confirm inhibition (Case et al., 2015; Y. He et al., 2021; Liao et al., 2021; Puga et al., 2020). BC often adsorbs NH 4 from soil, thereby reducing the pool of inorganic‐N for the N 2 O‐producing mechanisms (C. Li, Xiong, et al., 2021).…”

Section: Introductionmentioning

confidence: 98%

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How do biochar size fractions and organic fertilizers interactively influence nitrous oxide emission from a tropical vertisol?

Kollah

Ahirwar

Parmar

et al. 2022

J. Plant Nutr. Soil Sci.

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Background: Nitrous oxide (N 2 O) emission from agriculture is increasing alarmingly due to intensive application of inorganic and organic fertilizers. Recently, biochar has been identified as a promising additive to improve agriculture by enhancing soil function and mitigate greenhouse gas emission. However, it is unclear how biochar of different size fractions influences N 2 O emission from agricultural soil. Aims:The current experiment aims to understand how the size of biochar (BC) and organic fertilizers interactively influence N 2 O emission from a tropical vertisol.Methods: BC was prepared using pigeon pea (Cajanus cajan) stalks and further processed to obtain two size fractions (<0.25 mm or 0.25-2.00 mm). Organic fertilizers (vermicompost [VC], poultry manure [PM], or farmyard manure [FYM]) and BC were added to soil to evaluate N 2 O emission potential. BC was added to soil at 10% (w/w), whereas the organic fertilizers were added at 80 kg N ha -1 . Emission of CO 2 and the abundance of 16S rRNA and amoA gene copies were estimated after incubation period. The interactive effect of BC size fractions and organic fertilizers were statistically evaluated.Results: Both BC and organic fertilizers stimulated N 2 O emission in soil. BC of larger size stimulated N 2 O emission (µg N 2 O produced g -1 soil day -1 ) more than smaller size.Of the three organic fertilizers, PM resulted highest N 2 O (0.380) emission followed by FYM (0.240) and VC (0.210). BC (0.25 mm) + PM produced least N 2 O. Abundance of heterotrophic bacterial 16S rRNA gene copies and ammonia-oxidizing bacterial (AOB) amoA gene copies were highest in PM + BC and lowest in control. Significant relation (p < 0.0001) existed among N 2 O emission, CO 2 emission, and microbial abundance.Conclusions: BC of small size fraction along with organic fertilizers can be an effective strategy to mitigate N 2 O emission from tropical vertisol.

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Section: Introductionmentioning

confidence: 98%

“…Many reports indicate stimulation of N 2 O emission (T. He et al, 2018;Ji et al, 2020;L. Wang et al, 2020;Wu et al, 2021), while others confirm inhibition (Case et al, 2015;Y. He et al, 2021;Liao et al, 2021;Puga et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

How do biochar size fractions and organic fertilizers interactively influence nitrous oxide emission from a tropical vertisol?

Kollah

Ahirwar

Parmar

et al. 2022

J. Plant Nutr. Soil Sci.

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“…A global biochar strategy has been projected to be capable of reducing as much as 12% of human CO 2 –C equivalent emissions annually (Woolf et al, 2010). Biochar is a carbon‐rich substance generated from biomass by the process of pyrolysis in the absence of oxygen (He et al, 2021). The physicochemical properties (e.g., composition, particle and pore size distribution) of the resulting biochar are largely controlled by pyrolysis conditions and feedstock characteristics, which determine its suitability for a given application, as well as its behavior, transport, and fate in the environment (Verheijen et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…For example, several studies concluded that biochar application greatly reduces soil N 2 O emissions (Case et al, 2015; Han et al, 2021; Jia et al, 2012; Van Zwieten et al, 2014). The decrease in soil N 2 O emissions mostly resulted from improved soil aeration, pH modification, and N immobilization (He et al, 2021). In contrast, some other studies showed an enhancement in soil N 2 O levels after the addition of biochar (Bruun et al, 2011; Sánchez‐García et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…For the impacts of biochar application on soil N 2 O emissions, many metaanalysis studies have been conducted (Cayuela et al, 2014;Shakoor et al, 2021;Verhoeven et al, 2017). The results vary significantly in both magnitude and direction among different meta-analysis studies (He et al, 2021;Schmidt et al, 2021;Shakoor et al, 2021;Verhoeven et al, 2017). For example, several meta-analysis studies reveal a significant reduction in soil N 2 O emissions when biochar is added to soil (Borchard et al, 2019;Cayuela et al, 2014;Liu et al, 2018), but the magnitude varies among them.…”

Section: Introductionmentioning

confidence: 99%

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How much is soil nitrous oxide emission reduced with biochar application? An evaluation of meta‐analyses

et al. 2022

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Nitrous oxide (N 2 O) is the third important long-lived greenhouse gas next to carbon dioxide and methane and croplands are considered biogeochemical hotspots of soil N 2 O emissions. To reduce soil N 2 O and other greenhouse emissions, climate-smart agricultural practices including biochar application have been applied. Many studies have been conducted with biochar application but results from these studies are not conclusive. To address this issue, meta-analysis, a quantitative review that synthesizes results from multiple independent studies, has been widely used. The results from different meta-analyses also differ but are seldomly evaluated. In this study, we evaluated meta-analyses on the effects of biochar application on soil N 2 O emissions. A grand mean response ratio (RR) was further proposed to estimate an overall effect and the impacts of experiment setting, properties of biochar and soil, and agricultural practices. We found 18 metaanalysis papers were published between 2014 and 2022. Sample size (publications or experiments) varied from less than 30 to more than 1000, with a mean sample size of 275. RR was calculated in all studies except one. While four meta-analyses did not find a significant effect of biochar application on soil N 2 O emissions, all others reported reductions of soil N 2 O emissions, but the magnitude ranged from −10.5% to −54.8%. Synthesizing all results from these meta-analyses, we found that biochar application overall significantly reduced the soil N 2 O emissions by 38.8%. The impacts increased with experimental duration till one and half years and reduced after that. Biochar application rate and C:N ratio had large influence on the effects of biochar application on soil N 2 O emissions. This study demonstrated that while meta-analysis provides a more comprehensive and better estimation, the inconsistence among these studies may need to be further evaluated.A grand mean RR based on meta-analyses could be more accurate and representative than single meta-analysis.

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Global patterns and controls of soil greenhouse gas fluxes and crop yield under biochar application

Jia,

Yan,

Yang

et al. 2023

Land Degrad Dev

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Biochar application has been proven to be a viable technique in mitigating soil greenhouse gas (GHG) emissions and improving crop yield; however, the global patterns and responses of soil GHG fluxes, global warming potential (GWP), crop yield, and greenhouse gas intensity (GHGI) to biochar application, as well as the key drivers of biochar‐induced changes, are not fully synthesized. Hence, we conducted a meta‐analysis of 3883 paired observations from 220 studies. Overall, biochar application significantly increased carbon dioxide (CO2) emissions (7.4%) and yield (9.4%) and decreased soil methane (CH4, −13.0%) and nitrous oxide (N2O, −26.8%) emissions, as well as GWP (−7.7%) and GHGI (−14.3%). CH4 uptake was, however, not observed to change. The responses of soil GHG fluxes to the biochar application were more sensitive in the incubation and pot experiments compared to the field studies. In addition, increased CO2 emissions were mainly derived from incubation and pot experiments, whereas the biochar application did not significantly change CO2 emissions in the field studies. The climate, soil, and experimental conditions also affected the responses of soil GHG fluxes to biochar application, and the biochar‐induced change in soil pH was the most essential factor associated with the variations in soil GHG fluxes. Globally, biochar application boosted the soil carbon (C) pool (38.1% in upland and 33.4% in paddy) and decreased soil GHGI (−18.7% in upland and −14.5% in paddy). Our study highlights the role of the reduced CH4 and N2O emissions in the biochar‐induced mitigation of soil GHG emissions while exploring the relative importance of the influencing factors and providing crucial insights for the development of individualized biochar management measures.

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Antagonistic interaction between biochar and nitrogen addition on soil greenhouse gas fluxes: A global synthesis

Abstract: This is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 18 publications

References 95 publications

How do biochar size fractions and organic fertilizers interactively influence nitrous oxide emission from a tropical vertisol?

How do biochar size fractions and organic fertilizers interactively influence nitrous oxide emission from a tropical vertisol?

How much is soil nitrous oxide emission reduced with biochar application? An evaluation of meta‐analyses

Global patterns and controls of soil greenhouse gas fluxes and crop yield under biochar application

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