Research On Greenhouse Gas（N₂O）Emission Intensity Of Main Grain Crops

The research on greenhouse gas (N2O) emission of main grain crops is an application study for dealing with climate change in agricultural areas. Its purpose is to explore relations of wheat, rice and maize production and GHG(N2O) emission. Though this study GHG(N2O) emission intensities were estimated by countries and regions, several win-win suggestions for both GHG emission control and food security were proposed and become gist to support the international climate negotiation.Following results were fund by local survey, data collection and calculation1Comparing with global average, developed countries have lower N2O emission intensity of grain production. These countries should take the lead in taking action to support developing countries by green development funds and green technologies, adding and fulfilling commitments, for global sustainable development.2Developing countries have higher N2O emission intensity of grain production than the global average at large. The new-emerging developing countries, like China, India, Brazil, have higher emission intensity too, even with large sowing grain areas. While forcing developed countries to provide funds and technologies, the developing countries should take actions uninfluenced to reduce agricultural emissions, for global dealing with climate change and native sustainable agricultural development.3Comparing with global average (156gCO2e/kg), China have higher N2O emission intensity of main grain production(180gCO2e/kg). It might be caused by over-use of chemical fertilizer. Generally, the whole country has fertilizer used amount of400kg/hm2each year, over80%than global average of225kg/hm2.4Selected provinces have same trends with national N2O emission intensity of main grain production. While1980-2000with increase trend, during2000-2005the emission intensity reached the highest and then decrease a little. These Changes have same trends with chemical fertilizer use: Before1985, the fertilizer used amount was lower, mainly by organic fertilizer. After that chemical fertilizer use increased step by step, and reached the peak during2000-2005. Ministry of Agriculture has proposed a target and measures to reduce agricultural emissions uninfluenced, and enhance efficiency of nitrogen fertilizer use. Based on the intensity analyses of national and part of provinces, these measures have got significant effects. But agricultural emission reduction has not be included in the national GHG emission reduction target, thus the uninfluenced reduced dada might be ignored.Following conclusions can be got through further analyses1Integrate food security and sustainable agriculture target into global adaptation and mitigation of climate change policy. Further forcing developed countries take the lead of adding and fulfilling commitments to provide additional funds, increase ODA and reach green technology transfer2Include non-CO2GHG, like N2O, emission reduction into national GHG emission reduction target of per GDP would benefit reaching food security and sustainable agricultural development3Create comprehensive, shared, integrated accounting and validating systems of agricultural N2O and other non-CO2GHG emission, with converting them into CO2-e, shall provide key technique supports for including agriculture into national GHG emission reduction target of per GDP.4In whole China, especially in main provinces of wheat and maize production with higher N2O emission intensity, make great efforts to reduce1/3of chemical fertilizer use by subsidy and price policies, encouraging organic fertilizer use and straw-return land may reach win-win target both emission reduction and increase grain production...