The annual dynamics of N 2 O emissions from a tea field in southern subtropical China was observed in situ weekly in 2010 using a static closed chamber -gas chromatography (GC) method for three treatments: non-fertilised (CK), conventional (CON) and rice straw mulching (SM). The annual N 2 O emissions for CK, CON and SM were 7.1, 17.2 and 16.7 kg N/ha/year, respectively. The N 2 O emission factors for the CON and SM treatments were estimated as 2.23% and 1.91% of the total fertiliser N applied, respectively. Rice straw mulching exhibited a potential to reduce the N 2 O emissions from the tea field, but not statistically significant (P = 0.82). The daily N 2 O fluxes were positively correlated with the air temperature. The cumulative precipitation of the previous five days was significantly correlated with the daily N 2 O fluxes of CON. The soil water contents were significantly correlated with the daily N 2 O fluxes in the three treatments. The N 2 O fluxes from CON had a more significant correlation with the soil NH 4 + -N contents than with the soil NO 3 --N contents, while the N 2 O fluxes from SM showed an inverse pattern. The N 2 O fluxes from CK did not show any significant relationship with the soil mineral N content.
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