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- W4213092711 endingPage "108489" @default.
- W4213092711 startingPage "108489" @default.
- W4213092711 abstract "The responses of grain yield and greenhouse gas (GHG) emissions to climate warming in rice paddies are serious concerns for both global food security and climate change mitigation. However, the impact of free-air temperature increase (FATI) on grain yield and methane (CH4) and nitrous oxide (N2O) emissions remains unclear for one of the most globally significant rice production practices: the double rice cropping system. Here, we conducted a two-year field experiment to examine the effect of FATI by infrared heaters on grain yield and CH4 and N2O emissions in a double rice field in subtropical China. FATI increased rice canopy temperature by 2.0 °C and soil temperature by 1.2 °C on average but had no effect on either early or late rice yield production. FATI did not affect CH4 emissions, but significantly increased N2O emissions in both the early and late rice seasons. Averaged across two years, N2O emissions increased by 0.3 kg ha−1 and 0.7 kg ha−1 in the warmed plots for the early and late rice seasons, respectively. Consequently, FATI enhanced the global warming potential (GWP) and GHG intensity (i.e., yield scaled GWP) in the double rice cropping system. In addition, warming increased the abundance of ammonia-oxidising bacteria, ammonia-oxidising archaea, and a nitrite reductase gene (nirS), but decreased that of a nitrous oxide reductase gene (nosZ). Our results indicate that warming by FATI does not affect grain yield and CH4 emissions but stimulates N2O emissions in the double rice cropping system and therefore promotes a potential positive feedback with future climate warming." @default.
- W4213092711 created "2022-02-24" @default.
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- W4213092711 date "2022-05-01" @default.
- W4213092711 modified "2023-10-17" @default.
- W4213092711 title "Effects of free-air temperature increase on grain yield and greenhouse gas emissions in a double rice cropping system" @default.
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- W4213092711 doi "https://doi.org/10.1016/j.fcr.2022.108489" @default.
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