Decreased N2O and NO emissions associated with stimulated denitrification following biochar amendment in subtropical tea plantations

Ji, Cheng; Liu, Shuqing; Geng, Yajun; Yuan, Yiming; Zhi, Junzhang; Yu, Kai; Han, Zhaoqiang; Wu, Shuang; Liu, Shuwei; Zou, Jianwen

doi:10.1016/j.geoderma.2020.114223

Cited by 49 publications

(16 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the molar NO/N 2 O emission ratios were generally lower than unity (Figure S3), we inferred that denitrification is the dominant process involved in the observed soil N‐oxide emissions (Davidson et al, 2000; Skiba et al, 1993). This speculation is well supported by previous studies where they demonstrated that denitrification plays a dominant role in N 2 O emissions from acidic tea plantations (Ji et al, 2020; Yamamoto et al, 2014; Zou et al, 2014). It is worthy to note that despite the absence of biochar amendment effect on soil NO emissions, current lesser understanding of how biochar addition would affect NO emissions from various soils underlines more research is needed.…”

Section: Discussionsupporting

confidence: 76%

“…This knowledge gap may have contributed to taking no account of the impact of biochar addition on soil N 2 O emissions when evaluating its role as negative emission techniques in curbing climate change (Miller‐Robbie et al, 2015; Smith, 2016). Nevertheless, there is evidence that frequent biochar applications can maintain their suppression effect on N 2 O emissions from acidic soils (Ji et al, 2020). Notably, further research is needed to assess the feasibility of the practical and/or economic aspects regarding frequent biochar applications.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, few field studies examined the effects of biochar addition on soil NO emissions and showed inconsistent results. For example, some studies showed a significant reduction of soil NO emissions with biochar amendment (Ji et al, 2020; Zhang et al, 2019), whereas others reported no difference (He et al, 2019; Xiang et al, 2015). Consequently, there is a need to explore the overall effect and highly complex mechanisms of biochar amendment on N‐oxide emissions in subtropical tea plantations toward better use of biochar.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Differential responses of soil nitrogen‐oxide emissions to organic substitution for synthetic fertilizer and biochar amendment in a subtropical tea plantation

Han

Wang

et al. 2021

GCB Bioenergy

Self Cite

View full text Add to dashboard Cite

Tropical and subtropical acidic soils have been well documented as hotspots of global soil nitrogen (N) oxide (i.e., nitrous oxide (N2O) and nitric oxide (NO) emissions). While the effectiveness of possible mitigation options has been extensively examined in croplands, little is known about their effectiveness in reducing N‐oxide emissions from acidic soils of rapidly expanding tea plantations in China. Here, we conducted a 2‐year field experiment to investigate how organic substitution for synthetic fertilizer and biochar amendment affect soil N‐oxide emissions from a subtropical tea plantation. Across the 2‐year measurement period, full organic substitution for synthetic fertilizer significantly increased N2O emissions by an average of 17% while had a lower NO emission compared to synthetic fertilizer alone. Our global meta‐analysis further revealed that full or partial organic fertilizer substitution resulted in a 29% (95% confidence interval: 5%–60%) increase of N2O emissions from acidic soils. In contrast, irrespective of fertilizer type, biochar amendment significantly reduced N2O emissions by 14% in the first but not second experimental year, suggesting a transient effect. The trade‐off effect of full organic substitution on N2O and NO emissions may be attributed to the favorable conditions for N2O production due to the stimulated activity of nitrifiers and denitrifiers. The suppression of N2O emission following biochar amendment was probably due to promoted further reduction of N2O to dinitrogen. The fertilizer‐induced emission factor (EF) of N2O (2.1%) in the tea plantation was greater than the current IPCC default value, but the EF of NO (0.8%) was comparable to the global estimate. Taken together, while biochar amendment could have mitigation potential, cautions are needed when applying organic substitution for synthetic fertilizer as mitigation options for acidic soils as hotspots of N‐oxide emissions.

show abstract

Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Differential responses of soil nitrogen‐oxide emissions to organic substitution for synthetic fertilizer and biochar amendment in a subtropical tea plantation

Han

Wang

et al. 2021

GCB Bioenergy

Self Cite

View full text Add to dashboard Cite

show abstract

“…The biochar-induced suppression of soil N 2 O emission was probably driven by the reduction of electron donors and acceptors for denitrification, which might be attributed to sorption and/or immobilization of NO − 3 and NH + 4 onto biochar, and the decrease in microbial denitrification induced by the improved soil aeration (Cayuela et al, 2015;Harter et al, 2014;Xu et al, 2014). Furthermore, the decrease in soil N 2 O emission following biochar addition might stem from the stimulation of N 2 O-reducing bacteria community with the increased soil pH and dissolve organic C (Ameloot et al, 2016;Ji et al, 2020).…”

Section: Individual Effects Of Biochar or N Addition On Soil Ghg Fluxesmentioning

confidence: 99%

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

Yao

Jia

et al. 2021

GCB Bioenergy

View full text Add to dashboard Cite

show abstract

“…On the other hand, BC700 had a higher pH itself and its application increased soil pH as compared to BC300 application. The increase in soil pH may enrich some denitrification-related genes such as nirK and nosZ [49] and favor the last step of denitrification that produces N 2 instead of N 2 O [13,50,51]. Thus, BC700 has a greater ability to mitigate N 2 O emissions.…”

Section: Discussionmentioning

confidence: 99%

Greenhouse Gas Emissions from Forest Soils Reduced by Straw Biochar and Nitrapyrin Applications

Kwak

Chang

et al. 2021

Land

View full text Add to dashboard Cite

Forestlands are widely distributed in the dominantly agricultural landscape in western Canada, and they play important ecological functions; such forestlands (e.g., shelterbelts) accumulate soil organic matter and may receive a substantial amount of nitrogen in the form of surface and subsurface runoff from adjacent croplands and become a significant source of emissions of greenhouse gases (GHGs) such as CO2, N2O, and CH4. Biochar and nitrapyrin applications could potentially mitigate GHG emissions, but their co-application in forest soils has not been studied. We investigated the effect of the application of biochars produced at low (300 °C; BC300) and high temperatures (700 °C; BC700) using canola (Brassica napus L.) straw and the effect of their co-application with nitrapyrin on GHG emissions and soil properties in a 35-day laboratory incubation experiment using forest soils collected from five shelterbelt sites. Results showed no significant interaction effect of biochar and nitrapyrin on the global warming potential (GWP) of the GHG emissions, and the GWP was 15.8% lower in the soil with nitrapyrin than without nitrapyrin application treatments. The GWP was significantly enhanced by BC300 addition due to a 26.9% and 627.1% increase in cumulative CO2 and N2O emissions, respectively, over the 35-day incubation. The GWP significantly decreased by BC700 addition due to a 27.1% decrease in cumulative CO2 emissions. However, biochar addition did not affect CH4 emissions, while nitrapyrin decreased CH4 uptake by 50.5%. With BC300 addition, soil-dissolved organic carbon and microbial biomass carbon increased by 26.5% and 33.9%, respectively, as compared to no biochar addition (CK). Soil pH increased by 0.16 and 0.37 units after the addition of BC300 and BC700, respectively. Overall, the effect of biochar and nitrapyrin was independent in mitigating GHG emissions and was related to the type of biochar applied and changes in soil properties.

show abstract

Decreased N2O and NO emissions associated with stimulated denitrification following biochar amendment in subtropical tea plantations

Cited by 49 publications

References 52 publications

Differential responses of soil nitrogen‐oxide emissions to organic substitution for synthetic fertilizer and biochar amendment in a subtropical tea plantation

Differential responses of soil nitrogen‐oxide emissions to organic substitution for synthetic fertilizer and biochar amendment in a subtropical tea plantation

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

Greenhouse Gas Emissions from Forest Soils Reduced by Straw Biochar and Nitrapyrin Applications

Contact Info

Product

Resources

About