Biochar application increased methane emission, soil carbon storage and net ecosystem carbon budget in a 2-year vegetable–rice rotation

Qi, Le; Pokharel, Prem; Chang, Scott X.; Zhou, Peng; Niu, Hai-Dong; He, Xinhua; Wang, Zifang; Gao, Ming

doi:10.1016/j.agee.2020.106831

Cited by 62 publications

(20 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the measurement method and procedures previously described by Wang et al [49], the GC machine was calibrated with a mixture of standard gasses consisting of CO 2 (386.2 ppm), CH 4 (5.1 ppm) and N 2 O (0.5 ppm), and the concentrations of samples were represented using standard curves. The fluxes were calculated based on changes in gas concentrations inside the column headspace at time intervals relative to column closure using the mathematical model shown in Equation (1) [50][51][52][53].…”

Section: Sampling and Measurements Of Gas Emissionsmentioning

confidence: 99%

“…Literature evidence indicated that biochar input to soil can potentially reduce CH 4 emissions [26,90]. In contrast, Yu et al [91] and Qi et al [50] showed that charcoal input into soil may increase soil methane fluxes. Nevertheless, the findings here revealed that input of charred corn straw (biochar) into soil had no significant effect on CH 4 emissions (Figure 5b), probably due to the high variability of CH 4 resulting from rainfall patterns (Figure 1), therefore resulting in the lack of interaction between methanogen microorganisms and soil pH [92].…”

Section: Effect Of Biochar and Straw Input On The Ch 4 Fluxesmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study

et al. 2021

View full text Add to dashboard Cite

Adoption of crop residue amendments has been increasingly recommended as an effective management practice for mitigating greenhouse gas emissions while enhancing soil fertility, thereby increasing crop production. However, the effect of biochar and straw on nitrous oxide (N2O) and methane (CH4) emissions in soils of differing pH remains poorly understood. Three treatments (control (i.e., no amendment), maize straw, and biochar derived from maize straw) were therefore established separately in soils with different pH levels, classified as follows: acidic, neutral, and alkaline. N2O and CH4 were investigated using a static chamber–gas chromatography system during 57 days of a mesocosm study. The results showed that cumulative N2O emissions were significantly higher in acidic soils than in other experimental soils, with the values ranging from 7.48 to 11.3 kg N ha−1, while CH4 fluxes ranged from 0.060 to 0.089 kg C ha−1, with inconclusive results. However, a weak negative correlation was observed between log N2O and log NO3-N in acidic soil with either biochar or straw, while the same parameters with CH4 showed a moderate negative correlation, suggesting a likelihood that these amendments could mitigate GHGs as a result of the NO3-N increase in acidic soils. It is also possible, given the alkaline nature of the biochar, that incorporation had a significant buffer effect on soil acidity, effectively increasing soil pH by >0.5 pH units. Our findings suggest that for the rates of application for biochar and straw used in this study, the magnitude of reductions in the emissions of N2O and CH4 are dependent in part on initial soil pH.

show abstract

Section: Sampling and Measurements Of Gas Emissionsmentioning

confidence: 99%

Section: Effect Of Biochar and Straw Input On The Ch 4 Fluxesmentioning

confidence: 99%

Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Biochar can sequestrate carbon due to its recalcitrant carbon content, and it can also alter the SOC fate by influencing native SOC formation and mineralization when applied to the soil. The effects of biochar on SOC were widely studied under different conditions in the field experiments (Blanco‐Canqui et al, 2020; Liu, Zhu, et al, 2019; Qi et al, 2020), which provided valuable field data for our meta‐analysis here. 11.2% of our collected field data were also used in a previous meta‐analysis by Liu et al (2016), the RC SOC (45.8%) with biochar addition in this study is slightly larger than the RC SOC (40%, 95% CI = 32%–51%) from Liu et al (2016).…”

Section: Discussionmentioning

confidence: 99%

Global soil organic carbon changes and economic revenues with biochar application

Han

Zhao

et al. 2021

GCB Bioenergy

View full text Add to dashboard Cite

Biochar has been proposed as a promising negative CO2 emission technology to mitigate future climate change with the additional benefit of increasing agricultural production. However, the spatial responses of soil organic carbon (SOC) to biochar addition in cropland are still uncertain, and the economic feasibility of large‐scale biochar implementation remains unclear. Here, we analyzed the response of SOC to biochar addition using 389 paired field measurements. The results show that biochar addition significantly increased SOC by 45.8% on average with large regional variations. Using a random forest model trained with soil, climate, biotic, biochar, and management factors, we found that the response of SOC to biochar addition was mainly dependent on biochar application rates, initial SOC, edaphic (e.g., pH), and climatic (e.g., mean annual precipitation) variables. Combined with the predicted SOC changes to biochar addition on the global cropland, we assessed the revenue of the biochar system based on the current and potential pyrolysis plants in the world using the life‐cycle analysis. Net revenue of the currently existing 144 pyrolysis plants increases with larger plant capacity and higher carbon price. Potential revenue of building new plants is high in regions like America and Europe but low in regions with infertile soil, low crop residues availability, and inconvenient transportation. The global CO2 removal of biochar application is 6.6 Tg CO2e (CO2 equivalent) year−1 with a net revenue of $ 177 million dollars at a carbon price of $ 50 t−1 CO2 for current pyrolysis plants with a biomass‐processing capacity of 20,000 t year−1. Our study provides a full economic assessment of idealized biochar addition scenarios and identifies the locations with maximal potential revenues with new pyrolysis plants.

show abstract

“…The efficacy of biochar as a carbon sequestration agent is uncertain as the induced reaction to the soil is highly dependent, for example, the type of soil/land (marginal, fertilised). Recent works by Qi et al 31 suggested that biochar application increase CH 4 emissions; however, the emission could be compensated by the increase in soil C storage.…”

Section: Overview Of Direct and Secondary Carbon Emission Footprintmentioning

confidence: 99%

Bioenergy carbon emissions footprint considering the biogenic carbon and secondary effects

Fan

Klemeš

2020

Int J Energy Res

View full text Add to dashboard Cite

The sustainability of bioenergy is varying on a case-by-case basis. It considerably depends on the source of biomass, management practices (plantation, harvesting, conversion technologies, supply chain, etc.) as well as the assessment boundary and assumptions. This study summarises the carbon emissions footprint (CF) flow of bioenergy by considering the possible sources and system boundary, particularly on the CF of biogenic carbon and secondary effects. The assessment framework has been applied to a demonstrated case study identifying the upper limits of global warming potential of biogenic carbon emission (GWP bio) and secondary effects contribution where the bioenergy is still superior to the coal, natural gas and gasoline. The circumstances where the other energy source alternatives could have a lower CF than bioenergy are highlighted. For example, coal and natural gas are the selection (lower CF) if the bioelectricity is subjected to the GWP bio higher than 0.57-0.74 and 0.18-0.34. CF of bioheat is higher than the heat generated by natural gas when the GWP bio is more than 0.04-0.40. Gasoline is the selection when the GWP bio of biofuel is higher than 0.12-0.42. The validity of carbon neutrality assumption of bioenergy possesses a more decisive role in the overall selection of bioenergy compared to the assessed secondary effects such as soil organic carbon changes. This study emphasises the importance of a rigorous CF accounting for bioenergy to support the equitable decision making. Novelty Statement The novel contributions of this study are: (i) Summarising of the direct and secondary (soil organic carbon changesabove and belowground, biochar application) effects in accounting the CF for a comprehensive assessment framework. (ii) Identifying the CF, integrated with biogenic and non-biogenic accounting, of bioenergy from energy crops and waste/residual. (iii) Comparing the identified CF of bioenergy to the other energy alternatives (fossil-based).

show abstract

Biochar application increased methane emission, soil carbon storage and net ecosystem carbon budget in a 2-year vegetable–rice rotation

Cited by 62 publications

References 89 publications

Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study

Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study

Global soil organic carbon changes and economic revenues with biochar application

Bioenergy carbon emissions footprint considering the biogenic carbon and secondary effects

Contact Info

Product

Resources

About