Effect of soil water status and mulching on N 2 O and CH 4 emission from lowland rice field in China

摘要: Cultivation of rice in unsaturated soils covered with mulch is receiving more attention China because increasingly serious water shortage; however, greenhouse gas emission from this cultivation system still poorly understood. A field experiment was conducted 2001 to compare nitrous oxide (N2O) and methane (CH4) cultivated soil plastic or straw the traditional waterlogged production system. Trace fluxes were measured weekly throughout entire growth period using a closed chamber method. Nitrous emissions fields large varied considerably during season. They significantly affected by N fertilizer application rate. In contrast, N2O very low maximum 0.28 mg N2O m−2 h−1. However, CH4 higher than system, rate 5.01 mg CH4 m−2 h−1. Our results suggested that reduce emissions.