不同氮肥类型对大棚菜地NO排放的影响

Greenhouse vegetable fields are main resources of NO emissions. Field experiments were carried out in our study to explore the effect of different nitrogen fertilizer types on NO emissions. NO fluxes were simuEffects of different nitrogen fertilizer types on NO emissions from greenhouse vegetable fieldsEffects of different nitrogen fertilizer types on NO emissions from greenhouse vegetable fieldsltaneously measured by static opaque chamber and NOx analytical machine. The experiments were conducted with two vegetable seasons (Solanum lycopersicum and Glycine max) and fallow period. in other periods of fallow period. Four treatments were established: Control (without N application), CF (chemical fertilizer), OF (organic fertilizer) and CO (organic-chemical mixed fertilizer). The total N input of three fertilizer treatments was the same. The seasonal mean NO fluxes of Solanum lycopersicum and Glycine max were 109.48-165.89 μgom-2oh-1 and 111.76-209.76 μgom-2oh-1, respectively. The annual cumulative NO emission was 1.11-5.17 kgoNoha-1. The seasonal cumulative NO emission for Solanum lycopersicum and Glycine max were 1.43-2.46 kgoNoha-1 and 1.44-2.69 kgoNoha-1, respectively. The annual NO emission factors were 0.40%, 0.46% and 0.90%, for organic, chemical and mixed fertilizer treatment, respectively. Relative to organic and chemical fertilizer, organic-chemical mixed fertilizer significantly enhanced the NO emissions. In conclusion, the response of NO emission to organic fertilizer application was still unclear. More field measurements were highly needed to confirm the effect of organic fertilizer on NO emission. To explore the proper fertilizer types will provide the strong evidence to mitigate the NO emission of greenhouse vegetable fields.