Stoichiometric ratio of dissolved organic carbon to nitrate regulates nitrous oxide emission from the biochar-amended soils

Lan, Zhilong; Chen, Chengrong; Rashti, Mehran Rezaei; Yang, Hong; Zhang, Dongke

doi:10.1016/j.scitotenv.2016.10.119

Cited by 76 publications

(32 citation statements)

References 58 publications

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“…SOC was measured using the H 2 SO 4 -K 2 Cr 2 O 7 oxidation method (Lu 1999). The C and N contents of biochar were measured using an elemental analyser (vario Micro cube, Elementar, Hanau, Germany) (Lan et al 2017). The ammonium N (NH 4 + -N) and nitrate N (NO 3 --N) of soil and biochar were measured using a continuous flow analyzer (AA3, SEAL Analytical, Norderstedt, Germany) (Yao et al 2009).…”

Section: Methodsmentioning

confidence: 99%

“…Biochar samples were recovered for further extraction using 2 mol/L hot (95°C) KCl (1:10, w/v) at 250 rpm for 16 h before centrifuging and filtering (0.45 μm). DOC contents of extracts were determined using a TOC analyzer (model 1030, OI Analytical, College Station, USA) and biochar DOC was obtained by adding up the DOC contents of both cold and hot KCl extracts (Lan et al 2017). Soil MBC was measured using the CHCl 3 fumigation-K 2 SO 4 extraction method (1:4, w/v).…”

Section: Methodsmentioning

confidence: 99%

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Effects of biochar addition on CO2 and CH4 emissions from a cultivated sandy loam soil during freeze-thaw cycles

Liu¹,

Qi²,

Wang³

et al. 2017

Plant Soil Environ.

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This study was conducted to examine the effects of biochar additions (0, 2 and 4%, w/w) on soil carbon dioxide (CO2) and methane (CH4) emissions during freeze-thaw cycles (FTC). The results showed that soil CO2 emissions were stimulated by both FTC and biochar addition. However, the differences in soil CO2 emissions between control (CK) and FTC treatments were not significant when biochar addition rate was 4%, indicating that high biochar addition rate may have stronger effect on stimulating soil CO2 emissions than FTC. The increased soil dissolved organic carbon content, which attributed to the labile carbon in biochar, was the likely reason for the increased CO2 emissions. The negative CH4 emissions were promoted by biochar, especially under FTC conditions; possibly due to the structure of biochar soil aeration increased, which formed a favourable environment for methanotrophs. The results of this study indicate that biochar additions can increase soil CO2 emissions and CH4 uptakes during FTC, and such effects are different from those under CK conditions.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of biochar addition on CO2 and CH4 emissions from a cultivated sandy loam soil during freeze-thaw cycles

Liu¹,

Qi²,

Wang³

et al. 2017

Plant Soil Environ.

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“…For livestock wastes, the common method employed is the application of slurry generated from their treatments to improve soil fertility. Crop straws can be converted into biochar, which is applied to soil to promote carbon sequestration and soil amendment 5 , 6 .…”

Section: Introductionmentioning

confidence: 99%

Peanut-Shell Biochar and Biogas Slurry Improve Soil Properties in the North China Plain: A Four-Year Field Study

Xiao²,

Qi³

et al. 2018

Sci Rep

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Biochar and biogas slurry have been proved to improve the quality of some soil types, but the long-term effects on fluvo-aquic soil are not fully understood. This study aimed to compare the continuity effects of peanut-shell biochar and biogas slurry on the physicochemical properties, microbial population size, and enzyme activities of fluvo-aquic soil. We conducted a four-year field experiment of winter wheat-summer maize rotation in the North China Plain. Along with equal nitrogen inputs, three treatments were applied—conventional fertilizers, peanut-shell biochar, and hoggery biogas slurry—after which various soil quality indicators were compared. Compared with those of control, both biochar and biogas slurry increased the soil total nitrogen and organic matter content, and improved soil aggregation, microbial biomass, and actinomycetes. Biogas slurry decreased soil pH and improved urease and protease activities. With biochar and biogas slurry treatments, wheat yield increased by 8.46% and 23.47%, and maize yield by 18% and 15.46%, respectively. Biogas slurry increased the content of crude protein and starch in the grains. Both biogas slurry and peanut-shell biochar improved fluvo-aquic soil nutrient content, water-stable macroaggregates, and microbial population, which might be related to their high nutrient content, large specific surface area, adsorption capacity, and functional groups. Biogas slurry generally exhibited stronger effects than biochar probably because of its richness in nutrients and bioactive substances.

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“…Several studies have reported that biochar as a by-product from biofuel production has the potential to mitigate climate change (e.g., reducing nitrous oxide emission; Case, Mcnamara, Reay, & Whitaker, 2014;Stewart, Zheng, Botte, & Cotrufo, 2013). Nitrous oxide is one of the major greenhouse gases and has a global warming potential about 310 times that of carbon dioxide (CO 2 ) over a 100year horizon (Hu, Chen, & Dahlgren, 2016;Lan, Chen, Rezaei Rashti, Yang, & Zhang, 2017). Nitrous oxide (N 2 O) is responsible for 8% of global greenhouse gas emissions, while agricultural sources represent about 60% of total anthropogenic N 2 O emissions (Harter et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

High pyrolysis temperature biochars reduce nitrogen availability and nitrous oxide emissions from an acid soil

et al. 2018

Self Cite

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Biochar–bioenergy coproduction from biomass pyrolysis has the potential to contribute to climate change mitigation. Biochar produced at various pyrolysis temperatures (<600°C) has been widely studied. However, the effect of biochars, produced at high pyrolysis temperature (≥600°C), on soil nitrogen (N) dynamics and nitrous oxide (N2O) emission is largely unknown. A pot trial was performed to examine the effect of high pyrolysis temperature (600, 700, 850 and 950°C) woody biochars on soil N dynamics, microbial gene abundance and N2O emissions with (+N) and without N (−N) fertilization from an acid soil. Results showed that all biochar treatments significantly lowered the N2O emissions in both fertilized and unfertilized regimes. However, the suppressive effect on N2O emission among different high pyrolysis temperatures was not statistically different. Biochar amendment significantly decreased the concentration of soil NH4+, and lower levels of soil NO3− were observed at the later stage of experiment. Under −N, plant biomass and N uptake were significantly lowered in all biochar treatments. Under +N, biochar addition significantly increased plant biomass, while only the 700°C biochar significantly increased N uptake. This suggests that single application of biochar could limit soil mineral N bioavailability and further decrease plant growth and N uptake in the plant–soil system. Biochar amendments tended to increase nitrous oxide reductase (nosZ) gene abundance, but this effect was only significant for biochar produced at 950°C under +N. In conclusion, high pyrolysis temperature biochars can be effectively used to reduce N2O emission, while increases in nosZ gene abundance and decreases in NH4+ and NO3− concentrations in the acid soil are likely to be responsible for the reduction in N2O emission. Thus, woody biochars as a by‐product produced at high pyrolysis temperature have the potential to mitigate soil N2O emission via modifying N transformation and further affect climate change.

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Stoichiometric ratio of dissolved organic carbon to nitrate regulates nitrous oxide emission from the biochar-amended soils

Cited by 76 publications

References 58 publications

Effects of biochar addition on CO2 and CH4 emissions from a cultivated sandy loam soil during freeze-thaw cycles

Effects of biochar addition on CO2 and CH4 emissions from a cultivated sandy loam soil during freeze-thaw cycles

Peanut-Shell Biochar and Biogas Slurry Improve Soil Properties in the North China Plain: A Four-Year Field Study

High pyrolysis temperature biochars reduce nitrogen availability and nitrous oxide emissions from an acid soil

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