کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4424855 | 1309086 | 2011 | 10 صفحه PDF | دانلود رایگان |
An automated system for continuous measurement of N2O fluxes on an hourly basis was employed to study N2O emissions in an intensively managed low carbon calcareous soil under sub-humid temperate monsoon conditions. N2O emissions occurred mainly within two weeks of application of NH4+-based fertilizer and total N2O emissions in wheat (average 0.35 or 0.21 kg N ha−1 season−1) and maize (average 1.47 or 0.49 kg N ha−1 season−1) under conventional and optimum N fertilization (300 and 50–122 kg N ha−1, respectively) were lower than previously reported from low frequency measurements. Results from closed static chamber showed that N2O was produced mainly from nitrification of NH4+-based fertilizer, with little denitrification occurring due to limited readily oxidizable carbon and low soil moisture despite consistently high soil nitrate-N concentrations. Significant reductions in N2O emissions can be achieved by optimizing fertilizer N rates, using nitrification inhibitors, or changing from NH4+- to NO3ˉ-based fertilizers.
Research highlights
► N2O was produced mainly from nitrification of NH4+ based fertilizers.
► Denitrification played minor role on N2O emission due to C and soil moisture limitation.
► Using NO3− base fertilizer or NI is an effective way to reduce N2O emission.
Journal: Environmental Pollution - Volume 159, Issue 4, April 2011, Pages 1007–1016