温室气体排放与中国粮食生产

中国用占世界8％的土地养活了世界上1／5的人口，粮食生产已经基本满足了现有人口的需求。但是，生产粮食会向大气释放大最的温室气体。面对全球减少温室气体排放的压力，在粮食生产中，增加农田生态系统的碳固定能力及减少N2O和CH4的排放，直接关系着中国粮食生产的未来发展。文章分析全球和中国温室气体排放清单中粮食生产的作用和意义；利用生物地球化学模型DNDC和中国农业生产数据库，估算中国农田生态系统的土壤碳动态和N2O排放；通过情景分析(Scenario)，预测在不同方案下，中国农田生态系统碳动态和N2O的排放量；提出了我国未来粮食生产应该采取的对策和技术措施。

Greenhouse gases emission and crop production

In China, the crop produced from the 8% of the world land feed the one fifth of the world population. However, large amount of greenhouse gases are released from crop production. Under the pressure of global reduction of greenhouse gases emission, it strongly concern the future crop production of China how to enhance carbon sequestration by and reduce N2O and CH4 emission from agricultural ecosystems. In this paper, we assessed the contribution of crop production to the global as well as China greenhouse gases emission. By DNDC, a biogeochemical model, we estimate soil organic carbon change and N2O emission. Based on scenario analysis of organic carbon change and N2O emission in agricultural ecosystem, some measures have been proposed to meet reduction of greenhouse gases emission.