Lowering Greenhouse Gas Emissions from Summer Corn Production by Diversifying Managment Systems in North China

摘要

Improving management systems may help mitigate greenhouse gas emissions. The global warming potential (GWP) and greenhouse gas intensity (GHGI) of summer corn produced under diverse management systems was determined at Wuqiao, Hebei Province. The experimental treatments were: five N fertilization rates (0-N0, 75-N1,150-N2,225-N3 and 300-N4 kg N ha1), three tillage systems (conventional tillage (Inorg-CT), no-tillage (Inorg-NT), rotary tillage (Inorg-RT), and two fertilization types (fertilizer (Inorg-RT) and chicken manure (Org-RT)). Changes in soil C, total greenhouse gas emissions from the soil and various production inputs were used for the estimation of GWP and then greenhouse gas intensity (GHGI) was calculated using crop yield data and GWP. The results indicated that along with nitrogen application rate increasing, GHGI was marginally decreasing with the lowest observed under N3 at 132 Mg CO2eqvt Mg-1 which was 17.0% lower than that of NO. The GHGI in Inorg-NT was 29.2% lower compared with Inorg-CT and this was mainly driven by greater soil C and lower energy use. In addition, GHGI observed in Org-RT was 46.8% lower compared to InorgRT and this was mainly due to its greatest carbon sequestration potential In conclusion, Org-RT and Inorg-NT systems were mainly indicated the significance of well-managed systems, which had the capacity to substantially lower the GHGI under summer corn production in North China.