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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...
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