Rice straw incorporation affects global warming potential differently in early vs. late cropping seasons in Southeastern China

摘要: Abstract Paddy fields are a major global anthropogenic source of methane (CH4) and nitrous oxide (N2O), which very potent greenhouse gases. China has the second largest area under rice cultivation, so developing valid reliable methods for reducing emissions gases while sustaining crop productivity in paddy is paramount importance. We examined effects applying straw, residual product cultivation containing high amounts carbon nutrients, to crops during both an early season (5 April – 25 July 2012) late (1 August 6 November on CH4 N2O subtropical field southeastern China. fluxes had two seasonal peaks, 5 May 28 June, but only one peak, 13 August, crop, could be attributed lower temperatures after final tillering stage crop. Straw application significantly increased mean cumulative production (g m−2) relative control (37.3 vs. 8.34 mg m−2, P   0.05). The straw (75.9 43.4 μg m−2 h−1) decreased by over 43% (15.60 27.27 μg m−2 h−1) (P