IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Nitrous oxide and methane emissions from paddy soils in southwest China
Minmin Su1; Fuhong Kuang1,2; Yang Lv1; Xiaojun Shi3; Xuejun Liu1; Jianbo Shen1; Fusuo Zhang1
Corresponding AuthorXuejun Liu a
2017
Source PublicationGeoderma Regional
ISSN2352-0094
Pages1-11
Abstract

Using a static chamber-gas chromatography technique, we simultaneously measured the emissions of N2O and CH4 from paddy soils under three cropping systems (rice-fallow (RF), rice-wheat (RW) and maize-wheat (MW)) with three nitrogen (N) levels (N0, no N; Nopt, optimized N fertilization; and Ncon, conventional N fertilization) in a two-year field experiment in southwest China. Annual mean global warming potential (GWP) of CH4 and N2O was lowest (1775 to 2288 kg CO2-eq ha−1) in the RW system, medium in MW system (1915 to 6186 kg CO2-eq ha−1) and highest in RF system (7324 to 8112 kg CO2-eq ha−1). N2O emissions in N treatments accounted for approximately 90% of the GWP inMW system, and up to 40% of the GWP in RW system, and b8% of the GWP in RF system. The ranking of the annual mean yield-scaled GWP of CH4 and N2O was RW system (0.22–0.24 kg CO2-eq kg−1 grain) b MW system (0.36–0.96 kg CO2-eq kg−1 grain) b RF system (1.04–1.36 kg CO2-eq kg−1 grain). In the present study, the average N2O emission factor (EFd) was higher inWMsystem (Nopt: 1.82%, Ncon: 2.27%) than that in RWsystem (Nopt: 0.36%, Ncon: 0.55%) and in RF system (Nopt: 0.23%, Ncon: 0.37%). Given the comparable area- and yield-scaled GWP between the Nopt and Ncon treatments for RW and RF systems, the Nopt treatment that reduced local farmers' N fertilizer application rate by 33–40% maintained crop yields and decreased N2O emission and GWP of N2O plus CH4 in the subtropical rotation systems of southeast China.

KeywordNitrous Oxide Methane Cereal Cropping Systems Global Warming Potential Greenhouse Gas
DOI10.1016/j.geodrs.2016.12.003
Language英语
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Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/20736
Collection山地表生过程与生态调控重点实验室
Affiliation1.College of Resource and Environmental Sciences, Center for Resources, Environment and Food Security, Key Lab of Plant-Soil Interactions of MOE, China Agricultural University,Beijing 100193, China
2.Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 610041 Chengdu, China
3.College of Resource and Environmental Sciences, Southwest University, Chongqing 400716, China
Recommended Citation
GB/T 7714
Minmin Su,Fuhong Kuang,Yang Lv,et al. Nitrous oxide and methane emissions from paddy soils in southwest China[J]. Geoderma Regional,2017:1-11.
APA Minmin Su.,Fuhong Kuang.,Yang Lv.,Xiaojun Shi.,Xuejun Liu.,...&Fusuo Zhang.(2017).Nitrous oxide and methane emissions from paddy soils in southwest China.Geoderma Regional,1-11.
MLA Minmin Su,et al."Nitrous oxide and methane emissions from paddy soils in southwest China".Geoderma Regional (2017):1-11.
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