Differential responses of soil N2O to biochar depend on the predominant microbial pathway

Ji, Cheng; Liu, Shuqing; Geng, Yajun; Miao, Yingcheng; Ding, Ying; Liu, Shuwei; Zou, Jianwen

doi:10.1016/j.apsoil.2019.08.010

Cited by 39 publications

(13 citation statements)

References 48 publications

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“…The fluctuation of changes in N 2 O emission intensity among different parameters, including pH of biochar, feedstock, pyrolysis temperature of biochar, application rate, and C/N ratio of biochar, was lower in paddy and wetland soils (20%, p < 0.05) than in upland soils (62%, p < 0.05). N 2 O emissions are predominantly generated via N transformation in soils (Ji, Li, et al, 2020). The interaction between biochar and arbuscular mycorrhizal fungi affects N 2 O emissions in paddy fields and constructed wetlands (Liang et al, 2019).…”

Section: Effect Of Biochar On Ghg Emissions From Various Environmentsmentioning

confidence: 99%

Biochar affects greenhouse gas emissions in various environments: A critical review

et al. 2022

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Biochar application to the soil is a novel approach to carbon sequestration. Biochar application affects the emission of greenhouse gases (GHGs), such as CO2, CH4, and N2O, from different environments (e.g., upland soils, rice paddies and wetlands, and composting environments). In this review, the effect of biochar on GHGs emissions from the above three typical environments are critically evaluated based on a literature analysis. First, the properties of biochar and engineered biochar related to GHGs emissions was reviewed, targeting its relationship with climate change mitigation. Then, a meta‐analysis was conducted to assess the effect of biochar on the emissions of CO2, CH4, and N2O in different environments, and the relevant mechanisms. Several parameters were identified as the main influencing factors in the meta‐analysis, including the pH of the biochar, feedstock type, pyrolysis temperature, biochar application rate, C/N ratio of the biochar, and experimental scale. An overall suppression effect among different environments was found, in the following order for different greenhouse gases: N2O > CH4 > CO2. We conclude that biochar can change the physicochemical properties of soil and compost in different environments, which further shapes the microbial community in a specific environment. Biochar addition affects CO2 emissions by influencing oligotrophic and copiotrophic bacteria; CH4 emissions by regulating the abundance of functional genes, such as mcrA (a methanogen) and pmoA (a methanotroph); and N2O emissions by controlling N‐cycling functional genes, including amoA, nirS, nirK, nosZ. Finally, future research directions for mitigating greenhouse gas emissions through biochar application are suggested.

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Section: Effect Of Biochar On Ghg Emissions From Various Environmentsmentioning

confidence: 99%

Biochar affects greenhouse gas emissions in various environments: A critical review

et al. 2022

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“…An early field study showed that by reducing leaching and gaseous N losses, biochar increased fertilizer N retention in soil and promoted N utilization by plants (Güereña and Riha, 2013;Wang et al, 2020). Via the modification of N-related microorganisms, biochar soil incorporation was found to affect N transformation, benefit N availability and decrease N 2 O emissions (Nguyen et al, 2017;Xiao et al, 2019;Ji et al, 2020). Although many studies have been conducted to determine the effect of biochar on soil nitrification and denitrification processes, few studies have focused on the urea hydrolysis process, the exiting results with regarding to urease activity also varied with biochar material and soil type, ranging from increases (Wu et al, 2012;Amoakwah et al, 2022) to decreases (Song et al, 2019;Zhou et al, 2021) or no effect (Zhu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Urea hydrolysis in different farmland soils as affected by long-term biochar application

Zhao

Ju-ying

et al. 2022

Front. Environ. Sci.

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Urea is a commonly used nitrogen (N) fertilizer that contributes to world food production, and there have been increasing concerns about relatively low urea-N use efficiency. Biochar has shown the potential to mitigate N loss, but how biochar influences urea hydrolysis and the underlying mechanisms are still unclear. In this study, long-term biochar-amended upland, paddy and greenhouse soils were sampled at depths of 0–20 and 20–40 cm in Haicheng City, Northeast China. Soil N contents, urea hydrolysis rates (UHRs), and total, intracellular and extracellular urease activities were determined, as well as the total bacterial and ureolytic microbial gene abundance were quantified. The results showed that biochar increased total urease activity by 32.64–66.39% in upland soil and by 2.90–2.13-fold in paddy soil. Both intracellular and extracellular ureases contributed to the increase in total urease activity. However, in greenhouse soil, extracellular (+35.07–74.22%) and intracellular (−40.14–77.68%) urease activities responded inconsistently to biochar incorporation. Increases in ureC gene copy numbers (2.15- to 4.47-fold) in upland and greenhouse (20.93%) soil implied that biochar stimulated microorganisms capable of producing urease, and the biochar liming effect increased the soil pH (0.11–0.60 units), which optimized the ureolytic reaction, together explained the increases in urease activity. We found that the decreased soil N content was accompanied by a higher UHR in upland and greenhouse soils, suggesting that the accelerated UHR exerted a negative effect on the soil N content, possibly caused by excessive NH3 volatilization. In paddy soil, where the UHR was not increased, biochar was an effective amendment for simultaneously improving soil urease activity and N content.

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“…Moreover, biochar can affect the transformation and migration of soil nutrients through physical and chemical interactions with soil ( Li et al., 2019a ). In addition, the abundant pore structure in biochar can provide a habitat for soil microorganisms, which is conducive to their growth and to the improvement of the soil ecological environment ( Ji et al., 2019 ; Song et al., 2022 ). Thus, biochar has a wide application prospect in soil improvement and ecological restoration areas.…”

Section: Introductionmentioning

confidence: 99%

Biochar application ameliorated the nutrient content and fungal community structure in different yellow soil depths in the karst area of Southwest China

et al. 2022

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The influence of biochar on the change of nutrient content and fungal community structure is still not clear, especially in different yellow soil depths in karst areas. A soil column leaching simulation experiment was conducted to investigate the influence of biochar on soil content, enzymatic activity, and fungal community diversity and structural composition. Three biochar amounts were studied, namely, 0%(NB, no biochar), 1.0%(LB, low-application-rate biochar), and 4.0% (HB, high-application-rate biochar). The results showed that biochar increased the pH value and the contents of soil organic matter (SOM), total nitrogen (TN), available phosphorus (AP), and available potassium (AK) but reduced the microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN). Furthermore, this effect was enhanced with increasing biochar amount. Biochar was conducive to improving the nutrient availability in topsoil (0–20 cm), especially TN, AK, and MBN. Meanwhile, biochar affected the enzymatic activity, especially the sucrase activity. Biochar affected the diversity and structure of the fungal community, of which HB treatment had the most obvious effect. Among these treatments, Aspergillus, unclassified_Chaetomiaceae, Mortierella, Spizellomyces, Penicillium, Fusarium, and unclassified_Chromista fungal genera were the highest. Moreover, biochar inhibited the growth of harmful pathogens and increased the abundance of beneficial fungi in soil, and the effect was enhanced with increasing biochar amount and soil depth. Redundancy analysis (RDA) showed that AK was an important factor in yellow soil, although the main environmental factors affecting the fungal community structure were different in different soil depths. Overall, biochar had a positive effect on improving the land productivity and micro-ecological environment of yellow soil in the karst area.

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Differential responses of soil N2O to biochar depend on the predominant microbial pathway

Cited by 39 publications

References 48 publications

Biochar affects greenhouse gas emissions in various environments: A critical review

Biochar affects greenhouse gas emissions in various environments: A critical review

Urea hydrolysis in different farmland soils as affected by long-term biochar application

Biochar application ameliorated the nutrient content and fungal community structure in different yellow soil depths in the karst area of Southwest China

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