Mitigation options for methane, nitrous oxide and nitric oxide emissions from agricultural ecosystems

An experimental study on mitigation of greenhouse gas (CH4, N2O and NO) emi ssion has been conducted in a typical cropping system of Southeast China fo r 4 years. By simultaneous measurement, the CH4, N2O and NO emission fluxes from rice-wheat rotation fields, effects of fertilization, water managemen t, temperature and soil moisture were investigated. Temperature, fertilizat ion and water status were found to be the key factors to regulate CH4, N2O and NO emissions. Based on the experimental results, some agricultural meas ures were recommended as technical options to mitigate greenhouse gas emiss ions from rice-wheat rotation ecosystems. These mitigation measures are red ucing mineral N input, coupling organic manure with chemical fertilizers, a pplying fertilizers which release available N slowly during periods with in tensive plant activity, and applying dry fermented organic manure and well management of water and fertilizer.