Differences in CH4 and N2O emissions between rice nurseries in Chinese major rice cropping areas

摘要: Studies on greenhouse gas (GHG) emissions from paddy field have primarily focused the post-transplanting period, however, recent researches raise new concerns about GHGs emission rice nursery. In this study, CH4 and N2O fluxes were determined different nurseries under major cropping systems in China. The tested included flooded nursery (FN), moist (MN) dry (DN). Methane FN significantly higher than those MN DN all systems. When comparing with FN, decreased total by 74.2%, 72.1% 49.6% rice–upland rotation system (RUR), double for early (EDR) late (LDR), respectively. 99.2%, 92.0%, 99.0% 78.6% compared to single (SR), RUR, EDR LDR, increased 58.1–134.1% 28.2–332.7%, Ultimately, across systems, net global warming potentials (GWPs) of 33–68% 43–86%, mitigating effect GWPs varied greatly ranging 30.8% LDR 86.5% SR. Chinese actual was reduced 956.66 × 103 t CO2 eq theoretical estimate 2242.59 × 103 t CO2 eq if scenario 2012. Taking into account large area (2032.52 × 103 ha) China, results study clearly indicate importance mitigate Being effective reduce GHG increase yield, technique is a promising candidate climate smart cropping.