气候变化领域集成服务门户(CCPortal): Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season

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DOI	10.1016/j.envpol.2021.117026
	Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season
	Zhang Q.; Wu Z.; Zhang X.; Duan P.; Shen H.; Gunina A.; Yan X.; Xiong Z.
发表日期	2021
ISSN	2697491
卷号	281
英文摘要	Biochar may variably impact nitrogen (N) transformation and N-cycle-related microbial activities. Yet the mechanism of biochar amendment on nitrous oxide (N2O) emissions from agricultural ecosystems remains unclear. Based on a 6-year long-term biochar amendment experiment, we applied a dual isotope (15N–18O) labeling technique with tracing transcriptional genes to differentiate the contribution of nitrifier nitrification (NN), nitrifier denitrification (ND), nitrification-coupled denitrification (NCD) and heterotrophic denitrification (HD) pathway to N2O production. Then the field experiment provided quantitative data on dynamic N2O emissions, soil mineral N and key functional marker gene abundances during the wheat growing season. By using 15N–18O isotope, biochar decreased N2O emission derived from ND (by 45–94%), HD (by 35–46%) and NCD (by 30–64%) compared to the values under N application. Biochar increased the relative contribution of NN to total N2O production as evidenced by the increase in ammonia-oxidizing bacteria, but did not influence the cumulative NN-derived N2O. The field experiment found that the majority of the N2O emissions peaked following fertilization, in parallel with soil NH4+ and nitrite dynamics. Soil N2O emissions during the wheat growing stage were effectively decreased (by 38–48%) by biochar amendment. Based on the correlation analyses and random forest analysis in both microcosm and field experiments, the decrease in nitrite concentration (by 62–65%) and increase in N2O consumption were mainly responsible for net N2O mitigation, as evidenced by the decrease in the ratios of nitrite reductase genes/transcripts (nirS, nirK and fungal nirK) and N2O reductase gene/transcripts (nosZI and nosZII). Based on the extrapolation from microcosm to field, biochar significantly mitigated N2O emissions by weakening the ND processes, since NCD and HD contributed little during the N2O emission “peaks” following urea fertilization. Therefore, emphasis should be put on the ND process and nitrite accumulation during N2O emission peaks and extrapolated to all agroecosystems. © 2021 Elsevier Ltd
英文关键词	Biochar; Gene/transcripts abundance; Nitrifier denitrification; Nitrite accumulation; Nitrous oxide
scopus关键词	Ammonia; Bacteria; Decision trees; Denitrification; Ecosystems; Genes; Isotopes; Nitrogen oxides; Soils; Urea; Bio chars; Biochar amendments; Field experiment; Gene/transcript abundance; Growing season; Heterotrophic denitrification; N$-2$/O; Nitrify denitrification; Nitrite accumulation; Nitrous oxide; Nitrification; ammonia; carbon; nitrite; nitrogen 15; nitrous oxide; oxygen 18; biochar; denitrification; genetic marker; growing season; nitrite; nitrogen dioxide; nitrogen oxides; oxygen; paddy field; soil amendment; wheat; air and air related phenomena; ammonia oxidizing bacterium; Article; chemical labeling; concentration (parameter); controlled study; correlational study; denitrification; fertilization; genetic transcription; microcosm; nonhuman; plant growth; quantitative analysis; random forest; soil amendment; wheat; Nitrosomonadales
来源期刊	Environmental Pollution
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177168
作者单位	Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China; Georg-August University of Göttingen, Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, Büsgenweg 2, Göttingen, 37077, Germany; Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; Department of Environmental Chemistry, University of Kassel, Nordbahnhof Strasse 1a, Witzenhausen, 37213, Germany; State Key Lab of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
推荐引用方式 GB/T 7714	Zhang Q.,Wu Z.,Zhang X.,et al. Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season[J],2021,281.
APA	Zhang Q..,Wu Z..,Zhang X..,Duan P..,Shen H..,...&Xiong Z..(2021).Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season.Environmental Pollution,281.
MLA	Zhang Q.,et al."Biochar amendment mitigated N2O emissions from paddy field during the wheat growing season".Environmental Pollution 281(2021).