Emission of phosphine in intertidal zone for aquaculture along the northern Jiangsu coast and its influencing factors Emissions of methyl halides from coastal salt marshes: A review. Effects of different winter covering crops cultivation on methane (CH4) and nitrous oxide (N2O) emission fluxes from double-cropping paddy field Research on N2O Emission Fluxes of 3 Cultivated Grasslands in Growing Seasons